diff --git "a/Java351円235円242円350円257円225円351円242円230円351円233円206円347円273円223円345円217円267円/JVM 347円257円207円/JVM351円235円242円350円257円225円351円242円230円.md" "b/Java351円235円242円350円257円225円351円242円230円351円233円206円347円273円223円345円217円267円/JVM 347円257円207円/JVM351円235円242円350円257円225円351円242円230円.md"
index 5bda042..2eef813 100644
--- "a/Java351円235円242円350円257円225円351円242円230円351円233円206円347円273円223円345円217円267円/JVM 347円257円207円/JVM351円235円242円350円257円225円351円242円230円.md"	
+++ "b/Java351円235円242円350円257円225円351円242円230円351円233円206円347円273円223円345円217円267円/JVM 347円257円207円/JVM351円235円242円350円257円225円351円242円230円.md"	
@@ -1,52 +1,717 @@
-### JVM 鐙
-1. 焚担秤趨和氏窟伏媚坪贋吝竃。焚担扮昨窟伏均吝竃?低頁奕担電危議?
-2. JVM奕担登僅斤嵆頁辛指辺斤嵆?嗤陳乂圭隈。
-3. JVM議坪贋潤更?仟伏旗嚥析定旗議曳箭?Eden才Survivor曳箭。
-4. 低岑祇陳叱嶽征侍辺鹿匂?光徭議單髪泣?嶷泣讐和cms才G1?淫凄圻尖?送殻?單髪泣。
-5. 酒汽傍傍低阻盾議窃紗墮匂?辛參嬉篤褒牌溜塗担?奕担嬉篤。
-6. JVM坪贋葎焚担勣蛍撹仟伏旗?析定旗?隔消旗。仟伏旗嶄葎焚担勣蛍葎Eden才Survivor。
-7. JVM 竃孖 fullGC 載撞訓?奕担肇?貧電臥諒籾?
-8. JVM嶄匯肝頼屁議GC送殻頁奕劔議?斤嵆泌採恕幅欺析定旗?傍傍低岑祇議叱嶽麼勣議JVM歌方。
-9. 征侍指辺麻隈議糞孖圻尖。
-10. JVM坪贋庁侏議屢購岑紛阻盾謹富?曳泌嶷電會?坪贋徳嬾?happen-before?麼坪贋?垢恬坪贋吉。
-11. 傍匯和Java斤嵆議幹秀狛殻
-12. 低断?貧哘喘議JVM歌方塘崔阻陳乂。
-13. G1才cms曝艶。
-14. 奕担嬉竃?殻媚佚連。
-15. 傍匯和窃紗墮議峇佩狛殻
-16. JVM征侍指辺字崙?採扮乾窟MinorGC吉荷恬椿?
-17. ZGC 征侍辺鹿匂?阻盾狛宅
-18. 斤嵆議恵諒協了嗤陳曾嶽圭塀?
-19. 傍匯和 jvm 距單議垢醤?
-20. 斤嵆焚担扮昨氏序秘析定旗?
-21. 坪贋亶息才坪贋吝竃曝艶?
-22. 焚担頁tomcat窃紗墮字崙?
-23. 阻盾毛叺蛍裂室宝宅
-24. 距喘System.gc()氏窟伏焚担?
-25. 霧霧Minor GC訳周?full GC訳周
-26. Stop The World 阻盾狛宅?
-27. 霧霧低範紛謹富嶽OOM?泌採閲窒OOM?
-28. 阻盾狛JVM距單短?児云房揃頁焚担?泌採鳩協万断議寄弌椿?
-29. 猛右犯壇斌瞳佚連壓JVM陳倖坪贋曝囃
-30. 忖准鷹議園咎狛殻
-31. Java俶勣蝕窟繁埀指辺坪贋征侍宅?
-32. Java嶄征侍指辺嗤焚担朕議?焚担扮昨序佩征侍指辺?
-33. System.gc()才Runtime.gc()氏恂焚担並秤?
-34. 麼坪贋嚥垢恬坪贋
-35. 坪贋寂住札荷恬
-36. volatile 鋤峭坪贋嶷電會
-37. 坪贋庁侏眉寄蒙來
-38. 霧霧枠佩窟伏圻夸
-39. JVM 均坪贋吝竃朔?凪麿?殻頁倦辛写偬垢恬?
-40. 傍匯和JVM 械喘歌方嗤陳乂?
-41. VM 葎焚担聞喘圷腎寂紋算阻喟消旗?
-42. Java均議潤更頁焚担劔徨議?焚担頁均嶄議喟消旗(Perm Gen space)?
-43. JVM議喟消旗嶄氏窟伏征侍指辺担?
-44. 焚担頁忖准鷹?寡喘忖准鷹議恷寄挫侃頁焚担?焚担Java頁倡亭字?
-45. MinorGC 議狛殻
-46. CPU 媼喘狛互泌採蛍裂
-47. Serial嚥Parallel GC岻寂議音揖岻侃?
-48. WeakHashMap 頁奕担垢恬議?
-49. 盾瞥 Java 均腎寂式 GC?
-50. 低嬬隠屬 GC 峇佩宅?
-51. JVM嶄陳倖歌方頁喘栖陣崙?殻議媚均媚弌議?
+### JVM 膀?
+1. 篁?箙??????灸??篌?????????????絖?羣√?冴??篁?箙???九???????????羣√?削??篏???壩??箙??????????鐚?
+ 膈?鐚???????絖?羣√?咲??絽後????????篁ヤ???????居??
+ * ???綵?莪??????羞縁??羃≧??罩g`膸?罩∽?>散鐚?絲取?贋??絽т????上????ユ????????腥咲?頑??絨純??
+ * 絮?????????颷?紊????菴?紊э?????筝??号??莪??????倶??絽ц??菴????絎拷???????吟??
+ * 膾睡?????綮肴??紊?鐚?罸鋇?鎖腮???醇????ス????????腥咲?器????紙??腥咲?頑??絨純??
+ ???羣√?咲??絽後???????Ǎ??
+ * 腮?綺???活噯??????絖???脂?顥?菴?篋?JVM?????????紊у俉????-Xmx莅丞舟鐚????
+ * ??????篋????絖?羈?羲??Memory Leak鐚?鐚?絲壕院筝????茴?戎???篏?篁???区←綣???Ǎ??絲取?翫櫜?????腥咲?顔??羝????絨純??
+ ????????号??鐚?
+ * **???羣√??**鐚?
+ * 篏睡??JVM?????? `-XX:+PrintStackTrace` ?????医?阪????雁??綣?絽後?????篆≧?姒??絎?篏???医?隙?????篁g??茵????
+ * 罍???ラ??綵???肢??鐚?隋勌?????膸?罩∽?>散???
+ * 罍???ユ?号?????絮????????????育?????紊у?????
+ * 莪????JVM???紊у???????? `-Xss`鐚?篏????絽娯????奝?????鐚?綺????篌????篁g??鐚????
+ * **???羣√??**鐚?
+ * ????キ `OutOfMemoryError` 綣?絽醐?????綣?絽後?????筝? dump ???莉サ?????篁駈??Heap Dump鐚?鐚?絽悟???????? `-XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/path/to/dump.hprof`???
+ * 篏睡????????綏ュ?件??絋?VisualVM, Eclipse MAT, JProfiler, YourKit鐚????莉?Heap Dump???篁駈???????????絖????????????居????ユ?上??絖?羈?羲???刻??絋???ŭ??絲壕院??????紊ч?????絖?鐚???ŭ??GC Roots綣????篋?絎?篁ロ?????
+ * ??????GC??ュ??鐚?`-Xlog:gc*=info`鐚?鐚?茹?絲????絖?紜???粋????水??Full GC?????居????ゆ?中????絖?羈?羲颷??????紊у?顒丞舟筝?綵????
+2. JVM???箙???ゆ?上噲莟≧??櫔????九噲莟\???????ŭ????号?????
+ 膈?鐚?JVM筝肢?????菴?篁ヤ??筝ょ????号????ゆ?上噲莟≧????櫔????駈??
+ * **綣?????≧?井??鐚?Reference Counting鐚?**鐚?筝堺?鋇?噲莟≦?????筝?筝???????≧?医?????綵????筝?筝??井?劫?????絎???駈??莅≧?医?????1鐚?綣????紊掩????駈??莅≧?医?????1???篁私????九?肢?≧?医??筝?0???絲壕院絨掩?壚???櫝?遵??茴?戎?????鐚??櫆札茴??????吟??膽榊?号?奝?鞘札茹e?喝噲莟♂?雁??緇?ッ綣?????勰?????
+ * **?櫝松??у?????膊?羈?鐚?Reachability Analysis / Tracing Algorithm鐚?**鐚?菴???夌????筝紙???????ゆ?中?号????????菴?筝?膤糸??腱遺減???GC Roots??????絲壕院篏?筝肴儀??刻?????筝????膣???絋????筝?筝?噲莟≦??GC Roots羃≧??篁私??綣?????丞?梧??鐚???割??GC Roots??域唫絲壕院筝??櫝松鐚?鐚????莚????莚ュ噲莟≧?壚???櫜????鐚??櫆札茴??????吟???櫆札篏?筝?GC Roots???絲壕院?????ロ??????????堺??鐚????絽т賢?????サ?医????頫Ǎ??筝上???????絲壕院?????号????坂賢膠脂?????絮???у???????絲壕院?????号????坂賢絽檎?鏁??????絲壕院?????サ?井?号?????筝?JNI鐚?Native??号??鐚?綣??????絲壕院膈????
+3. JVM??????絖?膸????鐚???亥??篁d?????綛岩撮???罸?箴?鐚?Eden???Survivor罸?箴????
+ 膈?鐚?JVM???絖?膸????鐚?篁?HotSpot筝坂??鐚?筝肢?????筝削??
+ * **???鐚?Heap鐚?**鐚????箙??????????絲壕院絎?箴???遵????????????????絖?鐚????GC???筝肢????阪??鐚??櫜?????筝堺?亥??篁e?????綛岩撮???
+ * **???鐚?Stack鐚?**鐚?罸鋇?鎖腮????綮堺?狗?巡????????筝?筝????????????鐚????篋?絖????絮????????????????篏???井?????????????丈・?????号????阪???篆≧?壔????????絖???夌鎖腮?腱??????????
+ * **腮?綺顒≧?医?Ǎ??Program Counter Register鐚?**鐚????腓阪?????膾睡????ц?????絖??????????篁ゅ?医??鐚?箙???夌鎖腮?腱??????????
+ * **??サ?井?号?????鐚?Native Method Stack鐚?**鐚?筝?JVM篏睡????亥??Native??号???????\??箙???夌鎖腮?腱??????????
+ * **??号????削??Method Area鐚?/???腥咲?器??Metaspace鐚?**鐚?絖????綏画←????????阪??莉順??膠私拭??壔??絽檎??????????????????????恰?句??莚??????莚???????篁g??膈???井?勉?????JDK 7???箙??????壩宛箙?篁o??PermGen鐚?鐚?JDK 8???箙??????剛減???腥咲?器??Metaspace鐚?鐚????腥咲?岩戎?????サ?医??絖????
+ ??亥??篁d?????綛岩撮???罸?箴?鐚?藥?莅ゆ?? **1:2**鐚???恰?亥??篁e????????絖????1/3鐚????綛岩撮???2/3????櫆札???菴? `-XX:NewRatio` ?????域????器??箴?絋? `-XX:NewRatio=2` 茵?ず???綛岩撮:??亥??篁?=2:1鐚????
+ Eden???Survivor罸?箴?鐚???亥??篁e???????????筝坂??筝?Eden腥咲?翫??筝や肩Survivor腥咲?器??From???To鐚????藥?莅ゆ??箴???? **Eden : Survivor = 8 : 1 : 1**????櫆札???菴? `-XX:SurvivorRatio` ?????域????器??箴?絋? `-XX:SurvivorRatio=8` 茵?ずEden:Survivor=8:1鐚????
+4. 篏???ラ???????腱??????丈?狗????Ǎ??????????篌?膽榊?刻???????壕佪筝?cms???G1鐚??????サ?????鐚?羌?腮?鐚?篌?膽榊?鴻??
+ 膈?鐚?絽梧??????????丈?狗????????鐚?
+ * **Serial GC**鐚????膾睡????狗????Ǎ??菴?茵??????上????倶?九??蕁紙????????????????欠鎖腮?鐚?Stop The World, STW鐚????篌???号?夌?????蕭????鐚??????????CPU筝?鐚?鐚????絖?綣????絨????膽榊?号??STW??狗?顔?随??筝????????????≦??ッ紜????
+ * **ParNew GC**鐚?Serial GC???紊?膾睡???????ロ??篏睡??紊?筝?GC膾睡??綛区???????吟????虁侮紊?Server罔≦?鋇????薤??????亥??篁f?狗????Ǎ???櫆札筝?CMS??????篏睡?????篌???号??攻茵??????駈????鎞?STW??狗?眼??膽榊?号?壚????倶?夌?サ??綣??????駈??筝????荀?紊????CPU??壩?????
+ * **Parallel Scavenge GC**鐚???亥??篁f?狗????Ǎ??篏睡??紊???句??羈?鐚?菴醇??蕭???????????Throughput = ?????隙撮???菴?茵???狗?? / (?????隙撮???菴?茵???狗?? + GC??狗??)鐚?????櫆札???菴? `-XX:MaxGCPauseMillis` 莅丞舟???紊ф???????狗?雁?勖??鐚?篏????????????????篌???号?????????駜????膽榊?号??STW??狗?翫櫝?処????随?????羈?膕丞`?ァ??倶???????狗?眼??
+ * **Serial Old GC**鐚?Serial GC??????綛岩撮?????ロ??篏睡?????莅?-??雁??膊?羈???????篋?Client罔≦?????Parallel Scavenge??????紊???号?????
+ * **Parallel Old GC**鐚?Parallel Scavenge??????綛岩撮?????ロ??篏睡?????莅?-??雁??膊?羈????篌???号?奝????????????筝????綛岩撮?????銀????遵攻茵????膽榊?号??STW??狗?翫櫝?処????帥??
+ * **CMS鐚?Concurrent Mark Sweep鐚?GC**鐚?
+ * **??????**鐚?筝?腱?篁ヨキ????????上????九??蕁炊?狗?岩減??勖???????狗????Ǎ????坂????????莅?-羝???も??膊?羈?絎??ー???筝肢??篌???号??攻??????莅医??綛九??羝???わ??紊ч?????綏ヤ??筝???糸???????欠鎖腮????
+ * **羌?腮?**鐚?
+ 1. **???紮????莅逸??Initial Mark鐚?**鐚?STW鐚????莅?GC Roots??順?贋・??活????亥??絲壕院??????綺???綽???
+ 2. **綛九?????莅逸??Concurrent Mark鐚?**鐚????????欠鎖腮?膸х鮫菴?茵?????????駈??篁?GC Roots綣?紮?????????岩肩絲壕院??常?????莅井??????櫝松絲壕院????????区????推??筝????荀?STW???
+ 3. **?????井??莅逸??Remark鐚?**鐚?STW鐚?篆勖3綛九?????莅井????翫???????欠鎖腮?膸х鮫菴?茵????絲取?贋??莅遺婚?????????????i?????絲壕院??????莅域佖綵????菴?筝??倶侊???蕁炊?狗?贋?????紮????莅育?随??篏?菴?罸?綛九?????莅亥?KK??
+ 4. **綛九??羝???わ??Concurrent Sweep鐚?**鐚????????欠鎖腮?膸х鮫菴?茵?????????駈??羝???ゆ?????←???莅逸??筝??櫝松鐚????絲壕院?????延????壎?????莅?-羝???も??膊?羈?鐚?篌?篋х?????絖?腆???????
+ * **篌?膽榊??**鐚?
+ * 篌???刻??綛九????狗??鐚?篏????蕁帥??
+ * 膽榊?刻??絲?CPU莎?羣???????鐚?綛九????倶侊??順?銀?????????????欠鎖腮?鐚?篏?篌???????CPU莎?羣?綵怨??綺??????ц?緒??鐚????羈?紊???????羌????????鐘??鐚?綛九?????莅医??羝???ゆ????雁????欠鎖腮?篋х??????????常???Ű?順????遺??筝?罨?GC鐚?鐚????絖?腆??????勰??鐚??櫝?遵嚩??翫ぇ絲壕院????????狗??荀?茹???Full GC鐚????
+ * **G1鐚?Garbage-First鐚?GC**鐚?
+ * **??????**鐚?筝?罨冗?√???????≦?????????丈?狗????Ǎ??筝肢?????絲劫??紊??????????紊у??絖??????阪?Ǎ??????????????蕁炊?狗?翫???キ緇?蕭?????????????絎?絨???岩肩?????????筝阪??筝?ぇ絨???悟???????ス????阪??鐚?Region鐚?鐚?罸鋇?Region??遵櫆札??勖??Eden???Survivor???Old???茹???蚊??絎?莊?荼???筝?Region????????鞘桟??種???????倶???キ緇????腥咲?翫ぇ絨鋌ュ???????倶???????狗?雁??膸駚???種??鐚????????佂惨??や??筝ŭ????????茵Ǎ??罸閩≧?号????莅悟?????蕁炊?狗?器??篌?????????銀桟??惹??紊х??Region???
+ * **羌?腮?**鐚?
+ 1. **???紮????莅逸??Initial Mark鐚?**鐚?STW鐚?筝?CMS??????紮????莅亥瓜篌種?????莅?GC Roots??贋・??活?????絲壕院鐚?篏??櫆札??ñ??Remark??倶?狗?????綣????篆≧?壔??
+ 2. **綛九?????莅逸??Concurrent Mark鐚?**鐚?筝?CMS膠私室鐚???????絲壕院??常?????莅井??????櫝松絲壕院鐚?綛区?∞?????筝?Region????????銀桟??若??
+ 3. **???膸????莅逸??Final Mark鐚?**鐚?STW鐚?紊????綛九?????莅井????翫噲莟≦???????括鎧??????????????????
+ 4. **膈?????????駈??Cleanup鐚?**鐚?STW鐚???号??攻??????莅亥??膸????鐚?膈??????阪????銀桟??守?????筝?蘂?莅≦??蕁炊?狗?贋察莇活??羆????Region??????鐚?菴?茵??????吟???????倶?駈??絨?Region筝上??羇紫??絲壕院紊???九?亥Ã???Region筝昭和??綛倶????よ←??????Region???腥咲?眼??菴?筝???腮?篌???雁?????絖?鐚???鎞?腆???????
+ * **篌?膽榊??**鐚?
+ * 篌???刻??????羌???????蕁炊?狗?器?????菴? `-XX:MaxGCPauseMillis` 莅丞舟??勖??鐚?鐚?蕭?????????????遵???????ñ??紊?CPU篌???随????????茹e?喝??絖?腆??????勰??鐚??櫐?ï????уソ鐚???????篋?紊у??絖?鐚????
+ * 膽榊?刻????後噲紊????鐚????絖?????????蕭?鐚????荀?膸贋?ゆ?井?勛?????鐚?鐚????Region??育?颴?絨????絲壕院紊у?????絽?筝??????九櫝?巡??絋?CMS???
+5. 膊????莚頑?篏?篋?茹g??膠糸??莉遵?Ǎ???櫆札?????翫??篋峨??羇鞘??鐚????箙??????眼??
+ 膈?鐚?膠糸??莉遵????茣e??膠紫??絖??????????篁駈??.class鐚????莉遵??JVM筝昭和??綛句?????絲劫?????Class絲壕院???絽梧?????膠糸??莉遵?????鐚?
+ * **?????瓜???莉遵?Ǎ??Bootstrap ClassLoader鐚?**鐚?茣?茣e??莉? `<jre_home>/lib` ?????筝????茴? `-Xbootclasspath` ?????井??絎??????後??膠糸??鐚?絋?rt.jar鐚????絎????C/C++絎??ー???鐚?Java腮?綺????羈???贋・?キ?????九????????
+ * **??ï??膠糸??莉遵?Ǎ??Extension ClassLoader鐚?**鐚?茣?茣e??莉? `<jre_home>/lib/ext` ?????筝????茴? `java.ext.dirs` 膤紫???????????絎??????ï??膠糸?????
+ * **綺??????綺靏糸??莉遵?Ǎ??Application ClassLoader / System ClassLoader鐚?**鐚?茣?茣e??莉? `CLASSPATH` ?ッ紜?????????? `-classpath` ???絎????膠肢君緇?筝????膠祉??絎???壩??篁ス????????紊у????医???????綺????藥?莅ょ瓜???莉遵?????
+ * **?????箙?膠糸??莉遵??**鐚?膸ф?? `java.lang.ClassLoader` 綛狗????? `findClass`鐚???? `loadClass`鐚???号??絎??ー???
+ **???篋峨??羇丈─???鐚?Parent Delegation Model鐚?**鐚?綏ヤ??羌?腮???姒??絋????筝?筝?瓜???莉遵????九?遺?????莉順瓜???莚傑??鐚?絎?薤????筝?篌????訓絨?莚????莉緒??????????莚傑??紮?羇丞??絎??????句瓜???莉遵??????Ŭ??綵???句瓜???莉遵?????薤????訓???羈?絎???????莉巡算??≧?駈??絋???句瓜???莉遵??筝TEL??絖????唫膠誌??鐚?絖?膠糸??莉遵?????篌?絨?莚????訓?サ???莉純??
+ **?????翫??篋峨??羇?**鐚??櫆札?????器??篏????荀???????綛臥?????絽梧???????号?????鐚?
+ * **?????? `loadClass` ??号??**鐚????????箙?膠糸??莉遵??筝昭和??筝???球妾???篋峨??羇丞????肢??鐚???贋・莪???? `findClass` ??号??菴?茵????莉純??
+ * **?????? `findClass` ??号??**鐚?菴???壩?贋ィ????????劫????????????箙?膠糸??莉遵???? `findClass` ??号??筝上???ー???訓??????莉初?肢??鐚?絋?篁?臀?膸??????井????膈??????????篏?臀???莉緒??鐚?綛句`篆??????鞘????亥瓜??倶????? `ClassNotFoundException`鐚?菴???決??????鞘???????銀?????莉遵?Ǎ???????ス?九??莉遵?Ǎ??菴??????坂??絨?莚????莉純??
+ * **篏睡?? `ClassLoader#loadClass(String, boolean)` ??? `resolve` ??????**鐚???順?銀????贋・?????贋─???鐚?篏??櫆札?ァ??倶????В???膠祉??
+ * **膾睡??筝?筝????膠糸??莉遵?Ǎ??Thread Context ClassLoader鐚?**鐚????菴? `Thread.setContextClassLoader()` 莅丞舟鐚??櫆札???瓜???莉初?乗君筝中????ヤ??筝ŭ???????????莉遵?????箴?絋?鐚?JNDI?????&gt;戎???絎???ュ??莉処??羣?鐚??????岩??SPI鐚?Service Provider Interface鐚???堺?壚??藥?莅ょ?????篋峨??羇冗????吟??
+6. JVM???絖?筝坂??箙?荀?????????亥??篁o?????綛岩撮鐚????箙?篁c????亥??篁d賢筝坂??箙?荀????筝?Eden???Survivor???
+ 膈?鐚?
+ * **筝坂??箙??????亥??篁e?????綛岩撮**鐚?
+ * **絲壕院?????遵?????綏???**鐚?紊у????医噲莟≦?????綮阪??緇?綽?絨延?????緇?筝??櫝松鐚???上?遵噲莟\??鐚??Ŭ??絨???鎛壕院篌?絖?羇糸????炊?狗?器????水?遵噲莟\????????篁f?狗???櫆札???絲剛??????????遵????????絲壕院??????筝????????????句????ワ?????蕭??????????
+ * **?????倶?????**鐚???亥??篁e噲莟≦??綺???鐚?緇?紊????????常??鐚???????篏睡??紊???句??羈?鐚?Copying鐚?鐚????綺?辱??????綛岩撮絲壕院絲?綺???鐚?紊ч???????壩柑絲壕院鐚?鐚???????篏睡?????莅?-羝???わ??Mark-Sweep鐚???????莅?-??雁??鐚?Mark-Compact鐚?膊?羈?鐚???鎞????絖?羌?換???
+ * **??鎞?Full GC蘂????**鐚?絨???水?遵噲莟∞Щ??域??綛岩撮鐚??櫆札??鎞?絎?篁セ←蘂?膵???????????????句??綣????鐚????篏?Full GC???蘂???????
+ * **筝坂??箙???亥??篁e??Eden???Survivor**鐚?
+ * **紊???句??羈????絎??ー**鐚???亥??篁d源荀?篏睡??紊???句??羈????絨???亥??篁e??筝?Eden???筝ゅ??紊у????後?????Survivor腥咲?器??罸閩≦?????絲壕院??狗?遵??Eden??肴??茵????綵?Eden??堺察??区Е???Minor GC鐚?絨?Eden???筝????Survivor筝上??羇紫??絲壕院紊???九?医Ί?????腥榊??Survivor筝昭和??綛倶????????Eden??????Survivor???絖?羇紫??絲壕院綛顔??紜????鐚?莨上?遺??絎?綛顔??鐚?藥?莅?15鐚???? `-XX:MaxTenuringThreshold` ?ァ??駈?????絲壕院篌?茴?????????域??綛岩撮???
+ * **腥咲?贋?????**鐚?篁私????九????巡??莚????筝????Survivor??夌Ã???鐚?篏?筝坂??罨?GC??句??紊???句?勖??鐚???水??篋?蘂?膵???????絖????????????雁????????莅坂???Ŭ??10%???腥咲?頑←???羌?換???鐚????筝?Survivor??阪????亥??篁g??1/10鐚?鐚?篏???初?????紊????紊ч????上?遵噲莟∞?????綮阪???????吟??
+ * **絲壕院綛顔??膊∞??**鐚?Survivor??阪櫆札?????ヨ佖綵?絲壕院???絖?羇紙?狗?器??筝阪噲莟≧???????域??綛岩撮???箴?箴???勉??
+7. JVM ??榊ー fullGC 緇?蘂?膵?鐚????箙??サ膾推???????ラ?勰??鐚?
+ 膈?鐚??????ラ??膵?Full GC???罩ラĽ鐚?
+ * **??狗??GC??ュ??**鐚?隋勌??JVM綣???壚??GC??ュ???????緒??箴?絋?鐚?`-Xlog:gc*=info:file=/path/to/gc.log:time,uptime,level,tags`?????ュ?????篁区佖綵?篋?罸閩?GC???膠糸??????????吟????????絖???????膈?篆≧?壔??
+ * **??????GC??ュ??**鐚?篏睡??綏ュ?件??絋? `jcmd <pid> GC.print_heap_at_gc`, `jstat -gcutil <pid>`, ???筝????????ュ????????綏ュ?桁??GCEasy, GCViewer鐚?????????ュ?????
+ * ??ョ??Full GC???茹?????????鐚???虁??綛岩撮腥咲?岩??莇鰹??羂娯??篁?/???腥咲?雁Ã??岩??莇鰹??菴????System.gc()茴?????Ǎ????????CMS???Concurrent Mode Failure鐚?綛九??罔≦?鎀沿乾鐚????Promotion Failed鐚???????紊沿乾鐚?鐚?
+ * 茹?絲????綛岩撮?????亥??篁c??羂娯??篁?/???腥咲?雁??篏睡??????随????ゆ?中???ŭ肩??阪??絲取?雁????勰?????
+ * 莅∞??Full GC???綛喝????顔????狗?翫???????駈??莚?篌医襲??????
+ * **??????Heap Dump**鐚????Full GC????????倶??箙????鐚?篏睡?? `-XX:+HeapDumpOnOutOfMemoryError` ?????????篏睡?? `jmap -dump:live,format=b,file=heap.hprof <pid>` ?????????莉サ??綽??с??
+ * **??????Heap Dump**鐚?篏睡??MAT鐚?Eclipse Memory Analyzer Tool鐚????VisualVM???JProfiler膈?綏ュ?桁??莉?Heap Dump???
+ * ??ユ?上??絖?羈?羲?????菴?Dominator Tree??? Leak Suspects ??ュ??鐚???上?阪????????絖????紊????絲壕院?????九??????常????ゆ?中??????絲壕院??サ??茴??????銀??茴??炊????????綣???????
+ * 罍???ュぇ絲壕院鐚???ユ?上?????Ã??雁?劫??紊х??絲壕院鐚???ゆ?中?????壩3絽娯????♂??羆?菴??????絽娯婚??????
+ * 罍???ョ鎖腮????鐚??????句鎖腮???炊?狗?贋???????????紊?篋????腱???倶??箙?篌???贋・絲取?翫??絖???勰?????
+ * **罍???ヤ撮?????????臀?**鐚?
+ * 篁g??絮??????罍???ユ??????????????????膠脂?炊????????絲壕院綣???????紊у噲莟≦??綮阪?????????障??膽?絖???阪?区倘莅&gt;???????????膾睡??羈?羲靁???勰?????
+ * ???臀????????罍???ュ?????絖?紊у??? `-Xms`, `-Xmx`鐚??????倘臀勤??絨?????綛岩撮?????亥??篁f??箴???????????鐚?Survivor??堺??箴???????????鐚?GC膊?羈??????ð?????????綵????綺??????堺?姒?????腥咲?翫ぇ絨?? `-XX:MetaspaceSize`, `-XX:MaxMetaspaceSize`鐚??????恭紊????
+ * **????ァ??????**鐚?膸????膤紫??????ァ鐚?絋?CPU??????絖????膾睡????逸?????綺???????ァ鐚?絋?莚傑???????????綺???狗?器??鐚????Full GC?????????劫?????篏????蕭?絣井????後?潟??
+8. JVM筝TEL??罨≦????雁??GC羌?腮???壩????欠??鐚?絲壕院絋?篏?????????域??綛岩撮鐚?莚頑?篏???ラ????????腱?筝肢?????JVM?????違??
+ 膈?鐚?
+ * **筝?罨≦????雁??GC羌?腮?**鐚????絽御??篁?Minor GC??医櫝?処Е???Full GC???菴?腮????
+ 1. **Minor GC**鐚??????亥??篁gÃ??器??筝肢?????Eden??削??羯≧?区Е??????GC膾睡??篌????????????欠鎖腮?鐚?STW鐚?鐚???????Eden??阪??From Survivor??削??絨?絖?羇紫??絲壕院紊???九??To Survivor??削??綛倶?????Eden??阪??From Survivor??冴??絖?羇糸噲莟≦拘蘊?+1???絋????絲壕院綛顔??莨上?育????種?????????????域??綛岩撮???
+ 2. **Major GC / Full GC**鐚????絽後??篁ヤ???????笈Е???鐚?
+ * ???綛岩撮腥咲?岩??莇鰹??絋???亥??篁e噲莟≧?????絲取?頑??綛岩撮羯\?????
+ * 羂娯??篁?/???腥咲?雁Ã??岩??莇潟??
+ * System.gc()茴?????Ǎ??綮肴佈鐚????綣阪?駈?????
+ * CMS GC筝下??Concurrent Mode Failure???Promotion Failed???
+ * 膸?莅≦????亥??Minor GC????????域??綛岩撮???綛喝??紊у?鎀т?????綛岩撮?????î??腥咲?眼??
+ Full GC篌?????????岩肩???鐚???亥??篁e?????綛岩撮鐚?鐚?綛九櫝?処??茵???雁??鐚??????割??GC膊?羈?鐚?鐚??????区????随??篌?絲取?頑????炊?狗?雁??STW???
+ * **絲壕院絋?篏?????????域??綛岩撮**鐚?
+ * **綛顔????????**鐚????Survivor??坂賢鐚?絲壕院罸???セ??筝?罨?Minor GC鐚?綛顔??絨怨??1???綵?綛顔??莨上?遺??絎???種??藥?莅?15鐚???? `-XX:MaxTenuringThreshold` 莅丞舟鐚?鐚????筝?罨?Minor GC??九葦篌?茴?紊???九?域??綛岩撮???
+ * **紊у噲莟∞?贋・菴???ヨ??綛岩撮**鐚?絲剛??筝?篋?緇?紊х??絲壕院鐚?莇?菴? `-XX:PretenureSizeThreshold` 莅丞舟???紊у???鐚?筝坂????水?????Survivor??坂????翫????九研??ョ????ц?遵?????鐚?篌???贋・?????亥??篁?GC??九???????域??綛岩撮???
+ * **??????綛顔????ゅ??**鐚?JVM綛銀????紙?壚献??惹????у拘蘊??????若??絎?篌?膸?莅?Survivor??坂賢???筝?拘蘊?絲壕院??????????糸ぇ絨??絋???????筝?拘蘊??????????絲壕院?????糸ぇ絨鎀т??Survivor??榊??筝????鐚???d??紊т?????膈?篋?莚ュ拘蘊??????????絲壕院絨???贋・菴???ヨ??綛岩撮鐚???割戎絎?篁ス??綛顔??菴?羃∴松??育????若??
+ * **筝肢?????JVM??????**鐚?
+ * **??????絖???後??**鐚?
+ * `-Xms<size>`鐚????紮????紊у?????
+ * `-Xmx<size>`鐚????紊у??紊у?????
+ * `-Xmn<size>`鐚???亥??篁eぇ絨?????絽梧??綛岩撮紊у?? = MaxHeapSize - NewSize鐚????
+ * `-XX:NewRatio=<n>`鐚????綛岩撮/??亥??篁g??罸?箴?鐚?藥?莅?2鐚???活??綛岩撮:??亥??篁?=2:1鐚????
+ * `-XX:SurvivorRatio=<n>`鐚?Eden/Survivor???罸?箴?鐚?藥?莅?8鐚????Eden:Survivor=8:1鐚????
+ * `-XX:MaxTenuringThreshold=<n>`鐚?絲壕院?????????綛岩撮??????紊у拘蘊?鐚?藥?莅?15鐚????
+ * `-XX:PretenureSizeThreshold=<size>`鐚?紊т??罩ゅぇ絨????絲壕院??贋・???????????綛岩撮鐚?篁?絲?Serial???Parallel Scavenge GC??????鐚????
+ * **GC??後??**鐚?
+ * `-XX:+UseSerialGC`鐚?篏睡??Serial GC???
+ * `-XX:+UseParNewGC`鐚?篏睡??ParNew GC鐚???亥??篁e攻茵?鐚????
+ * `-XX:+UseParallelGC` / `-XX:+UseParallelOldGC`鐚?篏睡??Parallel Scavenge / Parallel Old GC???
+ * `-XX:+UseConcMarkSweepGC`鐚?篏睡??CMS GC???
+ * `-XX:+UseG1GC`鐚?篏睡??G1 GC???
+ * `-XX:MaxGCPauseMillis=<time>`鐚?G1 GC?????勖?????紊у??蕁炊?狗?器??罸???鐚????
+ * `-XX:ParallelGCThreads=<n>`鐚?綛区??GC膾睡????違??
+ * `-XX:ConcGCThreads=<n>`鐚?綛九??GC膾睡????逸?????篋?CMS???G1膈?綛九??GC鐚????
+ * **???腥咲??/羂娯??篁g?後??**鐚?
+ * `-XX:PermSize=<size>` / `-XX:MaxPermSize=<size>`鐚?羂娯??篁eぇ絨??JDK 7???箙????鐚????
+ * `-XX:MetaspaceSize=<size>` / `-XX:MaxMetaspaceSize=<size>`鐚????腥咲?翫ぇ絨??JDK 8???箙????鐚????
+ * **??銀??**鐚?
+ * `-XX:+PrintGCDetails`鐚??????域唵膸????GC??ュ?????
+ * `-Xlog:gc*=info`鐚?JDK 9+?ィ??????GC??ュ????劫?????
+ * `-XX:+HeapDumpOnOutOfMemoryError`鐚?OOM??句?????Heap Dump???
+ * `-XX:HeapDumpPath=<path>`鐚????絎?Heap Dump???篁区君緇????
+ * `-Xss<size>`鐚?莅丞舟膾睡?????紊у?????
+9. ?????上????句??羈????絎??ー?????????
+ 膈?鐚?筝肢??????????上????句??羈??????九?????鐚?
+ * **???莅?-羝???わ??Mark-Sweep鐚?**鐚?
+ * **??????**鐚????筝坂犬筝??倶侊???膃コ????倶侊??????莅謂??鐚?篁?GC Roots綣?紮???????絲壕院??常?????莅井??????櫝松絲壕院???膃コ????倶侊???羝???も??鐚?????????岩肩???鐚??????倶????????←???莅亥??絲壕院???????????腥咲?眼??
+ * **篌????**鐚?絎??ー膊????鐚?筝????荀?腱糸??絲壕院???
+ * **膽榊??**鐚???????筝?蕭?鐚?筝ゆ???????鐚?鐚?篌?篋х??紊ч?????絖?腆????鐚??櫝?遵嚩??翫??膸上?????紊у噲莟≧?狗??荀?茹???Full GC???
+ * **???莅?-??雁??鐚?Mark-Compact鐚?**鐚?
+ * **??????**鐚?箙??????筝坂犬筝??倶侊???膃コ????倶侊??????莅謂??筝?Mark-Sweep??後?????膃コ????倶侊?????雁?????鐚?絨???????絖?羇紫??絲壕院??????絖???阪?????筝?腴夌Щ??Ǎ????九??羝???????莨合??篁ュ????????絖????
+ * **篌????**鐚?茹e?割?????絖?腆??????勰?????
+ * **膽榊??**鐚?腱糸??絲壕院?????ソ??鐚????荀???贋?井???????????菴?篋?絲壕院???綣???Ǎ??鐚?????????狗?顔?帥??
+ * **紊???駈??Copying鐚?**鐚?
+ * **??????**鐚?絨????絖????筝坂犬???紊у????悟???????阪??鐚?絋?Eden???Survivor鐚????罸閩≦Ü戎?????銀賢筝????鐚?Eden + 筝????Survivor鐚????綵???????GC??駈??絨?絖?羇紫??絲壕院篁?綵????篏睡??????阪??紊???九?医Ί?????腥咲?峨?阪??鐚?綛倶?????????????阪?????
+ * **篌????**鐚?絎??ー膊????鐚???????蕭?鐚??Û????九??羇糸噲莟\??筝??????????絖????O(1)???篏?鐚?鐚?筝?篌?篋х?????絖?腆???????
+ * **膽榊??**鐚?腥咲?翫?ñ????篏?鐚??Ŭ??筝????腥咲?翫櫜?Ǎ??鐚?絲剛??絖?羇糸噲莟≦???????堺?姒??絋????綛岩撮鐚?筝??????????
+ * **???篁f?狗??鐚?Generational Collection鐚?**鐚?筝???壚??腱???隙?????膊?羈?鐚??????壚??腱?膈???ャ????坂??絲壕院?????遵?????綏?????????莅常??絨???????筝堺?亥??篁e?????綛岩撮?????亥??篁d戎???紊???句??羈?鐚?絲壕院?????上?盾??鐚?紊???倶????コ??鐚?鐚????綛岩撮篏睡?????莅?-羝???ゆ?????莅?-??雁??膊?羈?鐚?絲壕院?????水?盾??鐚?腱糸???????ソ??篏?腆??????勰????雁????削?????
+ * **紜??????狗??鐚?Incremental Collection鐚?**鐚?絨?筝?罨?GC篁糸?≦??茹d減紊?筝??閫ワ??罸閩≧?ц??筝?絨閫?GC鐚???九??莅ñ????欠鎖腮?菴?茵?筝?罧究?狗?器???????ц??筝?筝?絨閫ャ????勛??????鎞????罨?GC??????蕁炊?狗?器??篏??櫝?巡??紜???????GC??狗?翫??紊??????с??
+ * **綛九????狗??鐚?Concurrent Collection鐚?**鐚???ñ??GC膾睡??????????欠鎖腮?綛九????ц???????????鐚???鎞?STW??狗?眼??箴?絋?CMS???G1???綛九?????莅違??綛九??羝???ら?倶侊???篏?綛九????倶侊?櫝?巡??紜????CPU綣????鐚?筝?絖???????羌????????鐘????勰?????
+10. JVM???絖?罔≦???????後?括?ヨ??篋?茹e??絨?鐚?罸?絋???????綺?????絖?絮????鐚?happen-before鐚?筝糸??絖?鐚?綏ヤ?????絖?膈????
+ 膈?鐚?JVM???絖?罔≦??鐚?Java Memory Model, JMM鐚???夌??篋?絮???遵??腱?隋コ散??????篏?膤紫????????絖?莅翠??勲綣?鐚?篁ュ???ー莅?Java腮?綺???????腱?綛喝伻????処?処松??遺????雁?????絖?莅翠?勖????????茹???????絎???恰絵????????膾睡??箙???雁?????絖??櫝????у?????篁ら?????綺???勰?????
+ * **筝糸??絖?鐚?Main Memory鐚????綏ヤ?????絖?鐚?Working Memory鐚?**鐚?JMM茹?絎?鐚??????????????????遵????????筝糸??絖?筝昭和???櫆札???茹d減??ñ?????絖?鐚?鐚?罸???∞鎖腮???????訓???綏ヤ?????絖?鐚??櫆札???茹d減CPU膽?絖????絲?絖???Ǎ?????膾睡??絲劫???????????篏?鐚?莚糸?????莎???主??鐚???遵??蕁糸??綏ヤ?????絖?筝左??茵????膾睡????翫???????主??篌???????荀????菴?筝糸??絖???ュ????????菴?茹i??篋?筝坂??箙????紊?膾睡???ッ紜?筝?鐚?筝???医???????延昆?????顒翠?勌??絲取?贋?井?勌??筝???眼??
+ * **??????綺??Reordering鐚?**鐚?筝坂?????蕭???ц?緒??膽?莚????篌???????紊????????櫝?巡??絲号??篁ょ????ц??蕁阪?颷?茵???????綺???Ű??筝?菴??????井?勌??莎???с????????綺??????ス??莚?????????綺????紊????????????綺????
+ * **膽?莚?????????綺?**鐚?膽?莚???????筝???劫?????膾睡??腮?綺顓TEL???????????筝?鐚??櫆札?????医?????莚上媵????ц??蕁阪?????
+ * **紊????????????綺?**鐚??ー篁e?????????????羌?羂雁鎖???箙怨????ц??膈??????姒??箙??櫝?遵嚩??贋??篁ょ????ц??蕁阪?鋇?腮?綺鋌g?????蕁阪?鋇???????
+ * **???絖?絮????鐚?Memory Barrier / Fences鐚?**鐚?箙??ŭ????????篁ゃ????壚??腱?CPU???膽?莚???????篁わ?????篋??ァ??句?劫?????篏??????ц??蕁阪????櫆札?????ョ??罩∝?劫??膠糸?????紊????????????綺????膽?莚?????????綺????筝肢?????Load Barrier鐚?莚糸?????鐚????Store Barrier鐚????絮????鐚???????Java筝昭和??`volatile`?????????莚糸?????????????????/?キ???膈????篏???巡??????????遺戎??????絖?絮??????ヤ??莚??櫝????у?????綺???с??
+ * **happens-before??????**鐚?JMM???箴?篋?筝?膤糸??茹????鐚?happens-before rules鐚?鐚??????ュ?ゆ?上??膾睡??箙???贋??篏? visibility鐚??櫝????э????? ordering鐚????綺???э?????絋???????篏?A happens-before ???篏?B鐚???d??A?????ц??膸????絲?B?櫝??鐚?綛銀??A筝?絎?篌??????????B箙????鐚???順?銀??筝?絎???壩?狗?岩???????????鐚??櫝?処←??????綺?????筝肢??茹?????????ロ??
+ * 腮?綺馹阪?頵????鐚?筝?筝?鎖腮????鐚??????т撮???蕁阪??????????????∝?????篏? happens-before ?????∝?????篏????
+ * ???茹????鐚?茹i?? happens-before ?????√噲???筝?筝???????????????
+ * volatile?????頵????鐚?絲剛??筝? volatile ???????????????篏? happens-before ?????√噲菴?筝?????????莚紙??篏????
+ * 篌??????э??絋????A happens-before B鐚?筝? B happens-before C鐚???d?? A happens-before C???
+ * 膾睡????????????鐚?膾睡????? start() ??号?? happens-before 莚ョ鎖腮????罸鋇?筝???篏????
+ * 膾睡??筝中?左?????鐚?絲合鎖腮? interrupt() ???莪???? happens-before 茴?賢??下鎖腮????篁g??罍?羌???遺賢??TEL??篁句???????????
+ * 膾睡??膸?膸?茹????鐚?膾睡??筝下???????????篏? happens-before 膾睡?????膸?罩∽??羌????
+ * 絲壕院膸?膸?茹????鐚?筝?筝?噲莟∞??????????醇?井?ц??膸???? happens-before 莚ュ噲莟∞?? finalize() ??号??綣?紮???ц?????
+ * 篌??????э?????罨≦失莪?鐚?鐚?絋????A happens-before B鐚?筝? B happens-before C鐚???d?? A happens-before C???
+ 篋?茹h??篋?网?綽究????î?????茹e??膾睡??膽?腮?筝下??綛九????勰??鐚?絋?腴??????&gt;散???罩脂??膈?鐚?篁ュ??絋?篏?篏睡?? `volatile`, `synchronized`, `final`, `Lock` 膈???阪?倶?ヤ??莚?膾睡??絎???????
+11. 莚岩??筝?Java絲壕院??????綮肴??腮?
+ 膈?鐚?Java絲壕院??????綮肴??腮?紊ц?翫??筝?鐚?
+ 1. **膠糸??莉醇?????**鐚?綵?JVM?????遺?????new???篁ゆ?駈??薤????罍???ヨ??筝???篁ょ???????域?遵????絽檎?閺?筝上??篏???遺??筝?瓜???膃?垸????Ǎ??綛銀??罍???ヨ??筝???垸?????篁h;???膠紙????群茴????莉純??茹f????????紮????菴????絋????羃≧??鐚??????ц????後?????膠糸??莉処??腮????
+ 2. **?????????絖?**鐚?筝阪噲莟≦????????絖????絲壕院?????????絖?紊у?????瓜???莉遵????????箴水櫜`絎????????????劫??????????????腆井?????鐚?Bump the Pointer鐚???????腥咲?峨??茵????鐚?Free List鐚?筝ょ?????
+ * ??????腆井??鐚?絋??????????絖?茹???器??羃≧?????絖?腆????鐚?鐚???喝群篏睡???????絖????腥咲?峨??絖????菴?筝?筝????????????鐚??????????絖?絨掩?????????????腥咲?峨?阪??腱糸??筝?絲壕院紊у????悟?????莊?胼祉??
+ * 腥咲?峨??茵Ǎ??絋??????????絖?筝?茹???器??JVM膸贋?や??筝???茵?佖綵???ŭ?????絖???????櫜????鐚?????????銀?????茵?筝中?上?遺?????莇喝??紊х??腥咲?翫?????膸?絲壕院鐚?綛倶?贋?医??茵????
+ ?????ï??????劫???????割???????丈?狗??????????研???腥咲?贋?雁??鐚?Compact鐚??????純??Serial, Parallel Scavenge膈?絽???膽ñ????狗????????????????腆井??鐚?CMS膈???坂?????莅?-羝???ょ??羈??????狗???????絽檎?????Ã??峨??茵????
+ **綛九????勰??**鐚?紊?膾睡???ッ紜?筝??????????絖??櫝?巡婚?????牙?????茹e?恰?号?????鐚?
+ * **CAS鐚?Compare-And-Swap鐚?+ 紊沿乾???莚?**鐚?紊?筝?鎖腮?絨?莚???贋?井?????鐚????菴?CAS篆?莚????絖???э??紊沿乾??????莚????
+ * **TLAB鐚?Thread Local Allocation Buffer鐚?**鐚?筝堺?鋇?鎖腮???????筝?絨????腱???????絖?鐚?膾睡?????篁?TLAB筝上????????絖?鐚??Ŭ??TLAB???絎???????荀????罩ュサ筝糸???????阪????活噯鐚?紊уぇ??鎞????腴?篋????
+ 3. **???紮??????九??**鐚????絖???????絎???????鐚?JVM篌?絨?????????亥?????絖?鐚?筝??????サ噲莟≦ご鐚????藥?莅ゅ?取??茵????紮??????九?種??????????堺?ス瓜???筝?0???false鐚?綣????瓜???筝?null鐚????菴?篆?莚?篋?絲壕院絎?箴?絖?罧球??Java篁g??筝上櫆札筝?莎??????弱葦??贋・篏睡?Ǎ??筝?篌???榊ー???蘂???????藥?莅ゅ?若??
+ 4. **莅丞舟絲壕院紊?**鐚?JVM篌????絲壕院紊器??Header鐚?筝上?????筝?篋??????井?勌拭??姒??絋?鐚?
+ * 絲壕院???絮????膠糸????井?勖?????鐚?????????号????堺?????腥咲?岩賢???膠私拭??姒?????
+ * 絲壕院??????絽????鐚?絋????莅∞??菴?鐚????
+ * GC???篁e拘蘊?鐚?絲壕院綛顔??鐚????
+ * ?????倶?????綽??????????膾睡??ID???????????狗?贋?括??鐚?筝??????後?鰹?????
+ * ?????減????????????莉脂?靮ч??膈????
+ 5. **??ц??`<init>`??号??鐚???恰???????醇?逸??**鐚???????絖????????????九?弱??紮???????絲壕院紊頑倘臀?????????鐚?JVM篌?筝阪噲莟≦?????筝?筝???箴???号????削??綛倶?ц??膠紫??????????醇?逸??`<init>`??号??鐚?鐚???括????隙撮???筝上??箙????????????号?????????????醇?域??茣d減絲壕院???紮?????????九?種??綛倶?ц????銀?????紮??????肢?????絋????????????醇?遺賢莪????篋???句瓜???????????号??鐚?`super()`鐚?鐚?????????ц????句瓜???????????号?????
+12. 篏?篁ス鎖筝?綺??????JVM?????育??臀勌????ŭ?????
+ 膈?鐚?菴???壚??筝?????丈?ч?勰??鐚???隙?????臀勌????号???????瓜???鐚?絋?Web?????&lt;????劫???????????絖???井????膈?鐚????隋コ散莎?羣????綛九????????????兊?ц?醇?井?勛?????膣????緇?紊у勲綣????篁ヤ????壚??篋?絽梧?????膾推??JVM?????育??臀勖?劫?????箴?絖?鐚???隙????守??荀???号????????????笈????器??
+ * **??????絖?莅丞舟**鐚?
+ * `-Xms<size>` ??? `-Xmx<size>`鐚????絽梧倘臀勛?後???????種????水??菴?茵???九???????ï俉/膽ï俉絽??ョ????ц?遵????????箴?絋?鐚?`-Xms4g -Xmx4g`???
+ * `-Xmn<size>`鐚???亥??篁eぇ絨??絲剛??綛頑住篁e????狗??膵????綺???Ǎ???櫆札???綵?莪?紊э????鎞?Full GC???箴?絋?鐚?`-Xmn1g`???
+ * `-XX:NewRatio=<n>`鐚????綛岩撮筝???亥??篁g??罸?箴?鐚?藥?莅?2鐚??櫆札??号???????絲壕院?????遵?????莪???眼??
+ * `-XX:SurvivorRatio=<n>`鐚?Eden筝????筝?Survivor??榊??罸?箴?鐚?藥?莅?8???
+ * **GC??狗??????????**鐚?
+ * `-XX:+UseG1GC`鐚?絲剛??紊у??絖?鐚?>4G鐚??????≦??綺???Ǎ???ィ???篏睡??G1 GC鐚?菴醇??????羌???????蕁炊?狗?眼??
+ * `-XX:+UseParallelGC` ??? `-XX:+UseParallelOldGC`鐚?絲剛??菴醇??蕭???????????????劫????????????伻算??\???櫆札篏睡??Parallel GC???
+ * `-XX:+UseConcMarkSweepGC`鐚?絲剛??????????サ??????????劫????堺?姒???櫝?処?????篏睡??CMS鐚?篏????荀?????????後?喝????域??篌????
+ * **GC莪?篌???後??**鐚?
+ * `-XX:MaxGCPauseMillis=<time>`鐚?G1 GC?????勖?????紊у??蕁炊?狗?器??罸???鐚?鐚?G1篌???勖4莪????Region紊у??????????句????ャ??
+ * `-XX:ParallelGCThreads=<n>`鐚?綛区??GC膾睡????逸?????絽梧倘臀勌減膈?篋????絨鋋?CPU??後????違??
+ * `-XX:ConcGCThreads=<n>`鐚?綛九??GC膾睡????逸?????篋?綛九?????莅違??羝??????倶侊???
+ * `-XX:G1HeapRegionSize=<size>`鐚?G1筝?Region???紊у???綵怨??GC????????????蕁炊?狗?眼??
+ * `-XX:PretenureSizeThreshold=<size>`鐚?紊у噲莟∞?贋・菴???ヨ??綛岩撮???紊у???????若??
+ * `-XX:MaxTenuringThreshold=<n>`鐚?絲壕院?????????綛岩撮??????紊у拘蘊????
+ * **???腥咲?頑倘臀卡??JDK 8+鐚?**鐚?
+ * `-XX:MetaspaceSize=<size>`鐚????腥咲?翫??紮?紊у???莨上?井4??寂??茹???Full GC???
+ * `-XX:MaxMetaspaceSize=<size>`鐚????腥咲?贋??紊уぇ絨????我2???腥咲?贋?????紜???帥??
+ * **??銀??**鐚?
+ * `-XX:+UseCompressedOops`鐚?篏睡?????膽ð?勰??絲壕院??????鐚??????????絖????
+ * `-XX:+UseStringDeduplication`鐚???夌??絖?膃?顕?サ???鐚???鎞?絖?膃?顕絽檎?????絖??????Ǎ??G1??号??鐚????
+ * `-XX:+PrintGC` ??? `-Xlog:gc`鐚???????GC??ュ?????
+ * `-XX:+HeapDumpOnOutOfMemoryError`鐚?OOM??句?????Heap Dump???
+ * `-Djava.awt.headless=true`鐚?絋??????夌痕????佀????\???櫆札莅丞舟筝堺??紊贋─綣????
+ **???荀????腓?**鐚?篁ヤ??篁?筝榊ず箴?鐚?絎????膾推?????臀勰??荀?膸??????隙??綺??????茵????羌????????ァ???莪?篌????羃≧??膸?絲号??篌???????臀卡???Ŭ???????????綵????綺????????ッ紜???????臀勉??
+13. G1???cms??阪????
+ 膈?鐚?G1鐚?Garbage-First鐚????CMS鐚?Concurrent Mark Sweep鐚???醇?奝??絲号????≦?????????丈?狗????Ǎ????処????上?鎞?Full GC??????蕁炊?狗?器??篏?絎?篁サ??絎??ー?????????綏ヤ????劫?????????????堺?夌????拷?√???????乗????阪????
+ * **???絖?絽?絮?筝????篁?**鐚?
+ * **CMS**鐚?篁???九?坂??篌?膸???????篁f─???鐚???亥??篁c?????綛岩撮???羂娯??篁?/???腥咲?器??鐚?篏?筝肢????恰絵??亥??篁e???????????綛岩撮鐚?CMS?Û????倶?岩肩???綛岩撮?????岩肩??亥??篁o??????????岩肩??????筝???????鐚????
+ * **G1**鐚?筝?荀?羆???ñ??筝?菴?膸下?????絖?腥咲?器??絨??????????筝阪??筝?ぇ絨???悟???????ス??Region???罸鋇?Region?櫆札???Eden???Survivor???Old???G1?????句?∞????亥??篁e?????綛岩撮鐚?篏????菴?Region??ョ??膸????絎?菴????筝?筝?Humongous Region???篋?絖????紊у噲莟&lt;??
+ * **GC??勖??筝?膈????**鐚?
+ * **CMS**鐚?筝肢????勖????虁キ????????上????九??蕁炊?狗?眼??絎?筝肢???????綛岩撮腥咲?岩??莇恰?区Е???鐚???????綛九?????莅医??綛九??羝???ょ????ワ??紊ч?????綏ヤ??筝????????????欠鎖腮????
+ * **G1**鐚??????決申羆?篏????蕁随??篏???翫失莪?????羌???????蕁炊?狗?器?????菴? `-XX:MaxGCPauseMillis` ???絎?鐚????絎???????紜???鏁?????????号????篌?????????銀桟??惹??紊?Region???膈???ワ??筝?筝?罨≧?у????倶?岩肩?????????菴?莊?荼?Region????????銀桟??種???????句Ã??翫ぇ絨?????????倶?狗?器??鐚?篌?????????狗?d???????九????処キ緇?莨?紊у櫜??Ã??雁??Region???
+ * **???絖?腆????紊????**鐚?
+ * **CMS**鐚???坂????????莅?-羝???も??膊?羈?鐚?篌?篋х?????絖?腆???????腆????菴?紊???駈????割戎???綛岩撮菴????腥咲?器??箙??櫝?遵??筝堺??羈???上?域恭紊?菴?膸下?????絖???????茹???Full GC鐚?Concurrent Mode Failure鐚?鐚?罩ゆ?銀?????????????欠鎖腮?菴?茵?腆??????雁??鐚?絲取?翫??蕁炊?狗?翫櫝?遵????帥??
+ * **G1**鐚?????????倶?駈??Cleanup??倶侊鐚?篌?菴?茵?Region??雁??絲壕院紊???九????雁??鐚?篁????????????水??篋????絖?腆??????勰???????順??G1箙?菴?茵?絲壕院紊???駈??篏???区倘莅&gt;戎緇?菴?腱?紊???倶????ス?後噲?櫐ァ???
+ * **綛九??紊????**鐚?
+ * **CMS**鐚?綛九?????莅医??綛九??羝???ら?倶侊???荀??????欠鎖腮???????鐚???割????巡信??劫群???莅医噲莟∞??綣???????菴??????銀??綛九????????鐚?綛銀??絖???????羌????????鐘??鐚?綛九?????莅医????遺婚???????????常???Ű?巡??罨?GC?????駈?????
+ * **G1**鐚?綛九?????莅育?倶侊筝??????欠鎖腮?綛九??鐚?綛九??羝???ら?倶侊鐚?絎???????攻???紊???駈??箙?筝??????欠鎖腮?綛九?????G1???菴???雁仮隋勛??綛九?????莅医??Region膊∞??鐚???醇?翫ソ??医?????綛九??菴?腮?筝下??絲壕院綣??????????鐚?羌????????冗?勰????後噲莨?絅純??
+ * **????????堺??**鐚?
+ * **CMS**鐚??????????綛岩撮絲壕院絖?羇紫??筝?蕭?鐚???????絖?羇糸噲莟≦Û?????綛岩撮筝?絨???????鐚?筝?絲劫??蕁炊?狗?頑??羆?筝ユ?主??綺???????
+ * **G1**鐚???????紊у??絖?鐚?>4G鐚????紊????CPU????????≦??綺???Ǎ??絲劫??蕁炊?狗?贋??荀?羆?鐚?筝?絲壕院紊у?????絽??櫝?巡??????????堺?壔??絎???顔????Ǎ??綛銀????初????????紊у?鍽?????????ï?????
+ * **??銀??**鐚?
+ * **綛九??罔≦?鎀沿乾鐚?Concurrent Mode Failure鐚?**鐚?CMS筝左??絽梧??鐚?篌?絲取??STW菴?茵?腆??????雁?????
+ * **Promotion Failed**鐚?CMS筝昭和????亥??篁e噲莟≧???????域??綛岩撮??駈?????綛岩撮腥咲?岩??莇鰹??篌?絲取??STW菴?茵?Full GC???
+ * **Humongous Region**鐚?G1??号?????鐚????篋?絖???上ぇ絲壕院鐚?絋????筝?筝?ぇ絲壕院莇?菴?篋?筝?筝?Region???紊у???篌?茴???筝阪隈???絲壕院鐚???????紊?筝???膸下??Humongous Region???
+ 膊??????紫??鐚?CMS??岩??羈?篋????綛岩撮鐚????菴?綛九????鎞????蕁随??篏?腆??????勰??腦???削??G1??贋?岩????亥?∞?????鐚????菴?Region???篌????膾у??茵?絎??ー??翫櫐ァ???????羌????篏????蕁随??綛区В??割??腆??????勰??鐚?????????ф?翫洪???
+14. ???箙??????榊鎖腮????篆≧?壔??
+ 膈?鐚????Java筝昭和???櫆札???菴?篁ヤ?????腱???劫???キ???膾睡?????篆≧?姒??Thread Dump鐚?鐚?
+ * **篏睡??JDK???研???綏ュ??**鐚?
+ * `jstack <pid>`鐚?菴???壩??絽悟??????巡擦茵?綏ュ?激??`<pid>`??夌?勖??Java菴?腮????菴?腮?ID?????ц??莚ュ?巡擦篌??????医?肴唫JVM筝中?????膾睡?????綵??????倶?????莪???????篆≧?壔???櫆札絎??????ц??鐚?絋?罸?5腱???ц??筝?罨\??菴?膸中?ц?????罨\????ヨ??絲?膾睡????倶????????鐚??????î??絎?篏?罩脂?????膾睡????糸????勰?????
+ * `jcmd <pid> Thread.print`鐚?JDK 1.7???篁ヤ???????シ??箴??????????筝? `jstack` 膠私室鐚?莨???堺?弱???櫝?順?ユ??筝???????
+ * `jconsole`鐚???上就???綏ュ?件??菴??・???JVM???鐚???????膾睡????????蕁劫?&gt;賢?櫆札??ョ????????膾睡???????句?倶??鐚?菴??櫆札絲弱?榊鎖腮????篆≧?壔??
+ * `VisualVM`鐚???上就???綏ュ?件???????順瓜篌?jconsole鐚?箙???醇?ョ?????絲?
+15. 莚岩??筝?膠糸??莉順????ц??菴?腮????
+ 膈?鐚?Java膠紫?????莉処??腮?筝肢????????札筝?篋?筝??倶侊鐚????絽檎?球妾???篋峨??羇丈─???鐚?
+ 1. **???莉緒??Loading鐚?**鐚???ユ?上攻莚糸??膠紫??篋?菴???九?????羌?鐚?絋?.class???篁吟??臀?膸????????????????膈?鐚?鐚?絨???区習??≫減JVM????????`java.lang.Class`絲壕院絎?箴????菴?筝??倶侊筝肢????夌瓜???莉遵????号?勛瓜????????絎??????上?医噲綺????絖???????鐚?綛区嚞???菴?篋?絖??????????
+ 2. **薨?莚?鐚?Verification鐚?**鐚?隋勌?????莉順??膠紙??篁句????JVM茹????鐚?筝?篌???????絎????????í??菴??????シ??篁倶?弱?駚?莚?????????井?勰??莚????絖???????薨?莚????膃?垸???????莚????菴?筝??倶侊罸?莨??????駈??篏??櫆札篆?莚?膠紫??絎??????у??罩g`??с??
+ 3. **???紊?鐚?Preparation鐚?**鐚?筝榊瓜?????????????????????????????絖?鐚?綛区倘臀勛瓜?????????絎???????紮???種?????絽御?奝?九?種??絋?int筝?0鐚?boolean筝?false鐚?綣????瓜???筝?null鐚????羈?????菴????筝???????撮???筝中?丞ず莎???主????種??箴?絋? `public static int value = 123;` ??????紊???倶侊value?????惹??0鐚?莎???寂減123????????紮??????倶侊絎??????????
+ 4. **茹f??鐚?Resolution鐚?**鐚?絨?膠祉???・?叵??絖?罧球????号?????膃?垸?????習??≫減??贋・綣???????膃?垸???????夌??莚???句???????????莅逸????贋・綣??????壩????????絖?筝下?勖????医????????????????霡脂?????菴?筝???腮??櫝?遵???????????紮????箙???????箙????鐚??????割????隙??絎??ー???
+ 5. **???紮????鐚?Initialization鐚?**鐚?菴???夌瓜???莉順??????????倶侊鐚????罩f?ц??膠私賢絎?箙????Java篁g??鐚??????????紮?????????????????????顣???取喭?嫮??????????筝??倶侊鐚????????????鋍?茴???篋?腮?綺???????絎???????紮???種????????篁g?????篌?茴???ц?????菴?筝??倶侊??夌鎖腮?絎??????鐚?JVM篌?篆?莚?筝?筝?瓜?Ű←???紮????筝?罨&lt;??
+16. JVM?????上????倶?阪?駈??篏???区Е???MinorGC膈????篏??????
+ 膈?鐚?JVM????????上????倶?阪?倶??????????????銀?????茴???綺鋎睡???????絖?鐚?筝肢????勖??????鎞????絖?羈?羲?????????????絖?膊∞?????紊??????с??
+ * **篏???区Е???MinorGC鐚???亥??篁?GC鐚?**鐚?
+ MinorGC筝肢?????????????亥??篁e??絖?腥咲?岩??莇恰?吟??絽梧?????茹?????&gt;散?????ロ??
+ 1. Eden??榊Ã??雁??絨緒??綵???医??綮榊??絲壕院???羈????Eden??阪????????絖???駈??篌?茹???MinorGC鐚?絨?Eden??阪??From Survivor??坂賢菴?絖?羇紫??絲壕院紊???九??To Survivor??削??綛倶??腥?Eden??阪??From Survivor??冴??絖?羇糸噲莟≦拘蘊?+1???
+ 2. 莨上?遺??絎?罸?箴?????????種?????篋?GC膊?羈?鐚?絋?Parallel Scavenge鐚?篌???号????????????勖??????????倶???????ヨЕ???MinorGC鐚?筝?筝?絎?膈????Eden??阪?????紂?羯&lt;??
+ 3. System.gc()莪???Ǎ????順?銀????贋・篆?莚??ŰЕ???MinorGC鐚?篏???????篋??????灸???櫝?遵嚩???MinorGC???
+ * **篏???区Е???MajorGC / FullGC**鐚?
+ MajorGC???絽御?????綛岩撮?????上????駈?????FullGC???????シ?亥??篁c?????綛岩撮??????腥咲?器?????羂娯??篁o???????????絎???翫????上????駈??篌??????????????????欠鎖腮?鐚?STW - Stop-The-World鐚????茹???FullGC?????&gt;散???絽御?翫?????鐚??????ロ??
+ 1. **???綛岩撮腥咲?岩??莇?**鐚?綵?MinorGC???鐚????紊ч?鎛壕院鐚????絽梧??菴????筝?????種??絋?Parallel GC???`-XX:MaxTenuringThreshold`鐚?????????域??綛岩撮鐚?絲取?頑??綛岩撮腥咲?岩??莇恰?吟??
+ 2. **???腥咲??/羂娯??篁gÃ??岩??莇?**鐚????????????JVM鐚?篏睡??羂娯??篁o???????亥?????JVM鐚?篏睡?????腥咲?器??筝昭和?????莉順??膠私拭??夌???????井?????????腥咲?頑??菴?莅上????惹?吟??
+ 3. **膤紫??莪????System.gc()**鐚?綣榊??綮肴佈JVM??ц??FullGC鐚???隙??茵?筝坂??莎?JVM絎??ー鐚?篏????絽御?虁????件?????
+ 4. **MinorGC??句Ã??翫????????篆?紊沿乾**鐚??????ц??MinorGC???鐚?JVM篌?罍???ヨ??綛岩撮??î??腥咲?贋????恭紊?絖???丈?シ?MinorGC蘂?????????????絲壕院???絋????筝?紊?鐚?筝坂??篆?莚????絖?絎???Ǎ??篌???贋・茹???FullGC??ヨ?上?肴??綛岩撮腥咲?眼??
+ 5. **???腥咲??/羂娯??篁e????上?????**鐚???順?銀??蘂?膵?鐚?篏???????腥咲??/羂娯??篁gÃ??雁冠綣???駈??箙?篌?菴?茵??????上????銀札?????鞘?????篏睡????膠糸??莉遵???????九??莉順??膠私拭??壔??
+17. ZGC ?????丈?狗????Ǎ??篋?茹h?????鐚?
+ 膈?鐚???夌??鐚?ZGC鐚?Z Garbage Collector鐚????Oracle鐚??????ユ??筝?OpenJDK???筝???????鐚?綣???????筝?腱???医??篏?綮区???????丈?狗????Ǎ????????絎??ー???篏???????蕁炊?狗?器?????絽後?????罸??????鐚?鐚??????倶?壩?????絽後ぇ?????????絖?鐚?TB膾у???????
+ * **??????**鐚?
+ ZGC?????後???????恰??**綛九?????莅?**???**綛九????雁??**鐚?絨遵櫝?遵?鎞?STW鐚?Stop-The-World鐚??????狗?眼??
+ 1. **蘂???我?????鐚?Colored Pointers鐚?**鐚?菴????ZGC?????渇??????違??絎???ñ??ー篁?64篏?CPU?????????腥咲?器??絨??????????篏????篏????篋?絖????絲壕院?????倶??篆≧?姒??絋????????羇祉??絮?篋???ŭ肩???篁c???????←???絎?篏?膈?鐚????菴?篏水?????莅医?????絎?篏????篏??櫆札???筝?????????岩肩???????????灸??鐚????菴?????????セ昆?????倶??菴?茵???ゆ?上??篆勖?鴻??
+ 2. **莚糸?????鐚?Read Barriers鐚?**鐚??????綺顓糸??絲壕院綣??????倶????ヤ??筝?住??靮х??絮????篁g?????菴?筝?????????篋????綛九????雁??菴?腮?筝昭和??絋????莚糸????亥??綣??????????篋?筝?筝?3???←腱糸????絲壕院鐚????絨???倶?贋?遺減??亥????医?????菴?篆?莚?篋?腮?綺顒翠???亥??絲壕院??医??紮?膸???壩???????????
+ 3. **綛九??紊????**鐚?ZGC??????莅違??莉スЩ鐚?Relocation鐚?膈?筝肢????倶侊??醇??攻?????ц?????鐚??Ŭ??緇???下?????紮????莅医?????膸????絎?篏???倶侊篌?STW???
+ * **羌?腮?**鐚?
+ 1. **綛九?????莅逸??Concurrent Mark鐚?**鐚?????????????GC Roots鐚????莅井??????櫝松絲壕院???菴?筝???腮?筝?綺????鎖腮?綛九????ц?????
+ 2. **綛九??蘂?紊????絎?篏?鐚?Concurrent Prepare for Relocation鐚?**鐚?筝堺?鋇???荀????絎?篏???????絖???阪??鐚?Region鐚?莅∞?????絎?篏???????
+ 3. **綛九?????絎?篏?鐚?Concurrent Relocation鐚?**鐚????筝?????????絎?篏???????絨?絖?羇糸噲莟&gt;????у?医??紊???九?井?亥??菴?膸上??絖?腥咲?器??綛倶?贋?育????我?????筝下????医??篆≧?壔??菴?筝???腮?箙????攻??????鐚?莚糸?????茣?茣e?????綺????鎖腮??????絎?篏?菴?腮?筝左倧??勖?у?医??????????泣??
+ 4. **綛九?????絎?篏????茵?羝????鐚?Concurrent Relocation List Cleanup鐚?**鐚?羝???????絎?篏?菴?腮?筝下??筝贋?倶?井?勉??
+ * **篌?膽榊??**鐚?
+ * **篌????**鐚?
+ * ???篏???????蕁炊?狗?器?????絽? < 10ms鐚?鐚?筝????蕁炊?狗?翫?堺?コ????????紊у?????絖?羇糸噲莟≧?育?鍽?????????乗??紜???帥?? + * ??壩??莇?紊у?????絖?鐚?TB膾э????? + * 蕭?????????????後噲篋????蕁炊?狗?頑??荐?鐚???? + * **膽榊??**鐚? + * ??後噲篋?CMS???G1鐚?ZGC???荀???翫?????CPU莎?羣?鐚?絨ゅ?倶?壩?後????逸????ユ?壩??綛九??紊??????? + * ???絖????????ラ??鐚???延??蘂???我???????????絖???阪??膊∞??膈?綣????鐚???? + * 莨???亥???????姒???櫝?遵?????篋???劫????堺?壩????х ?篁銀?????茵?ー筝?絋??????????????????狗???????? +18. 絲壕院???莅翠????篏??????ŭ犬腱???劫??? + 膈?鐚?Java腮?綺????菴????筝????reference鐚?綣???Ǎ??膠糸????井?勖?ユ??篏????筝??????隙??絲壕院???JVM茹????筝上??箙?篋?筝ょ??筝紙?????絲壕院莅翠????篏???劫??? + 1. **?媳??羆???劫???Handle Pool鐚?**鐚? + * **膸????**鐚???????絖?筝上???????坂???????阪??篏?筝阪媳??羆?鐚?Handle Pool鐚????罸鋇?噲莟≦?????筝上???????駈??篌?????媳??羆?筝上?????筝?筝?噲綺?????媳????? + * **?媳?????絎?**鐚??媳?????絽後?????犬??????鐚?絲壕院絎?箴???井???????筝下??絎??????医??鐚?`instance data address`鐚????絲壕院膠糸????井?卡??絋???号?????絖?罧灸拭??夌??鐚??????医??鐚?`metadata address`鐚???? + * **綣???????絎?**鐚????筝????reference?????鎕????????虁??筝?媳???????医????? + * **莅翠?勤??腮?**鐚?荀?莅翠??噲莟≦??箴???井?勖?駈?????荀???????菴?reference??上?医媳??鐚???????菴??媳????上?医????????絲壕院??井???医?????荀?莅翠??噲莟∞瓜?????井?勖?駈?????菴?reference??上?医媳??鐚???????菴??媳????上?医????井???医????? + * **篌????**鐚?reference??セ昆??夌┳絎????鐚?絲壕院絎?箴???井?勖??膠糸????井???????腱糸?Ǎ??絋?GC??雁??鐚???駈???Ū??荀???劫???媳??筝下????医??鐚????reference??????篆勖?鴻?? + * **膽榊??**鐚?莅翠??噲莟♂??荀?筝ゆ????絖???贋・莅翠?卡??reference -> handle -> object鐚?鐚?????????後噲莨?篏????
+ 2. **??贋・????????劫???Direct Pointer / Inline Pointer鐚?**鐚?
+ * **膸????**鐚?絲壕院??????筝上???????駈????九??絖?絽?絮?筝TEL????????瓜?????????鐚???????絲壕院絲劫?????膠糸????井?卡?????
+ * **綣???????絎?**鐚????筝????reference????????贋・絖?????????噲莟≦??箴???井???????筝下??莎桁????医?????
+ * **莅翠?勤??腮?**鐚????菴?reference?櫆札??贋・絎?篏???医噲莟≦??箴???井?勉??莅翠?勛瓜?????井?勖?駈?????菴?絲壕院絎?箴???井???医?????筝?筝?筝??阪???????霡脂??????JVM??????墾絎?鐚???上?亥瓜?????????鐚???????菴?膠糸??????????上?医????井?勉??
+ * **篌????**鐚?莅翠??噲莟≦Ū??筝?罨≦??絖???贋・莅翠?卡??reference -> object鐚?鐚?????????顔???????????篋??媳??羆????腥咲?眼??
+ * **膽榊??**鐚?綵?絲壕院茴?Щ??Ǎ??絋?GC??雁??鐚???駈??reference筝下????医?????荀?茴???贋?逸??菴????絽檎??荀?STW鐚?Stop-The-World鐚???ヤ??莚?筝???贋?с??
+ * **?ー???**鐚??ー篁?HotSpot JVM筝肢????????**??贋・??????**??劫??????筝阪?????紊у????医?堺?壚????ц?醇?翫ソ????媳??羆???劫?????筝?篋?莨???ñ??JVM絎??ー?????劫????堺?壚???櫝?遵????????
+19. 莚岩??筝? jvm 莪?篌????綏ュ?件??
+ 膈?鐚?JVM莪?篌?菴?腮?筝TEL???????医??腱?綏ュ?傑?ョ???ァ???莚???上??篌????JVM??ц?緒??筝肢?????筝?JDK???研綏ュ?桁??膃コ????劫??筝?/綣?羣?綏ュ?件??
+ * **JDK???研綏ュ??**鐚?
+ 1. **jps (Java Process Status)**鐚???ョ??綵????筝紙?坂????????Java菴?腮????菴?腮?ID鐚?PID鐚????筝紫瓜???鐚???壚戎?????銀??JDK綏ュ?欠??膃コ??罩ャ??
+ 2. **jstat (Java Virtual Machine statistics monitoring tool)**鐚?????ァ???腱?JVM???????倶??鐚???劫?????????丈?狗??篆≧?壔??絽悟????蕁劫?? `jstat -gcutil <pid> <interval> <count>` ??ョ????????絖?篏睡???????GC膸?莅&lt;??
+ 3. **jstack (Java Stack Trace)**鐚???????膾睡??綽??э??Thread Dump鐚?鐚????篋???????膾睡????倶?????罩脂??膈???勰??鐚?綏峨???勰??14筝左唵膸?莚贋??鐚????
+ 4. **jmap (Java Memory Map)**鐚?
+ * `jmap -heap <pid>`鐚???ョ????????絖???岩???????居???????サ??紊у?????篏睡??????????篁f????窮?????
+ * `jmap -histo <pid>`鐚???ョ?????筝?絲壕院絎?箴???育???????????紊у?靳?莅\?????膠紙??綺?????
+ * `jmap -dump:live,format=b,file=<filename.hprof> <pid>`鐚??????????莉サ??綽??э??Heap Dump鐚?鐚????????????絖?羈?羲??????渇?卡??`live`?????域;腓阪Û?????絖?羇糸噲莟&lt;??
+ 5. **jinfo (Configuration Info for Java)**鐚???ョ???????????篆勖??JVM???菴?茵???九????違??`jinfo -flags <pid>` ??ョ????????JVM?????逸??`jinfo -sysprops <pid>` ??ョ??膤紫??絮???с??
+ 6. **jhat (Java Heap Analysis Tool)**鐚????篋??????????jmap????????????莉サ?????篁駈??.hprof鐚????綏臥??羝?茴?綣???Ǎ???ィ???篏睡??VisualVM???Eclipse MAT膈???翫失紊х??綏ュ?激??
+ 7. **VisualVM (jvisualvm)**鐚???????篋?jstat???jstack???jmap??????????????緒?????箴???上就????????????櫆札????ァCPU??????絖????膾睡?????GC?????居????ョ?????莉サ?????膾睡??綽??х??鐚????絽後????????
+ 8. **JConsole**鐚???坂??JMX?????上就???????ァ綏ュ?件???櫆札菴??・JVM鐚???ョ?????絖????膾睡?????膠糸??莉純??GC膈?莚???篆≧?姒??綛倶?壩??MBean???篏????
+ 9. **Arthas**鐚???水???????姒????奝?翠??綣?羣???????鎖莚???上轡??件????????篆勖?剛撮???????????????????喝櫔噲膾推??Java腮?綺颷?茵?莚???昭和????壩??膾睡???????????膠紙??篁倶?ョ???????号????ц??????ァ???JVM篆≧?壩?ョ??膈????
+ * **膃コ????劫轡???**鐚?
+ 1. **Eclipse Memory Analyzer (MAT)**鐚?綣阪ぇ??????莉サ????????綏ュ?件????劫???????水????????絖?羈?羲?????箴? Leak Suspects ??ュ??鐚??櫆札??ユ?上????????絖????紊????絲壕院鐚?DOM - Dominator Object Map鐚????
+ 2. **YourKit Java Profiler / JProfiler**鐚????筝?膾?Profiler鐚????箴?篌?腱????CPU??????絖????????????緒????壩????醇?桁??篁????????????鐚??櫆札綵???倶?号??莪????????????????絖???????莊???膈?鐚??????初??絽後???≪??
+ 3. **GCViewer / GCLogAnalyzer**鐚?筝??????篋?茹f???????????GC??ュ?????綏ュ?件???櫆札絨?GC??ュ???櫝?????鐚???????GC蘂??????????蕁炊?狗?眼??????????靁??????????
+ 4. **Prometheus + Grafana + JMX Exporter**鐚????菴?JMX Exporter絨?JVM???JMX??????絲弱?阪??Prometheus鐚???九?????Grafana筝左??茵??櫝?????????ァ??????茘???
+20. 絲壕院篁?箙???九??篌?菴???ヨ??綛岩撮鐚?
+ 膈?鐚?絲壕院篁???亥??篁f???????域??綛岩撮鐚?Tenuring鐚????絽後????????篁ヤ?????腱??????居??
+ 1. **莨上?井??紊у拘蘊???????**鐚?菴???壩??絽梧??????????泣??罸鋇?噲莟≦????亥??篁d賢膸????筝?罨?MinorGC絖?羇私????ワ????九拘蘊?鐚?Age鐚?絨怨??1???綵?絲壕院???綛顔??莨上??JVM?????? `-XX:MaxTenuringThreshold` 莅丞舟??????紊у?惹?駈?????筝?筝?罨?MinorGC??駈??菴?篋?莨上?井??紊у拘蘊????絲壕院篌?茴??贋・紊???九?域??綛岩撮???
+ 2. **Survivor腥咲?岩??莇?**鐚??????茵?MinorGC??駈??絖?羇私????ョ??絲壕院???荀?茴?紊???九??To Survivor??冴??絋????To Survivor??阪?î??腥咲?岩??莇割札絎合些??????絖?羇糸噲莟\????d??綛顔??莨?紊х??絲壕院鐚???割戎羃≧??莨上?? `MaxTenuringThreshold`鐚?篌???贋・茴?????????域??綛岩撮鐚?篁ヨ?上??Survivor腥咲?雁??綛頑住???絲壕院???
+ 3. **紊у噲莟∞?贋・菴???ヨ??綛岩撮鐚?Eden??阪?????紊沿乾鐚?**鐚?絲剛??筝?篋?篏?腱虁??紊х??絲壕院鐚??櫆札???菴? `-XX:PretenureSizeThreshold` ?????域倘臀勰????種?????篏?絖????鐚?鐚?筝坂????水?????Eden??阪??Survivor??坂????翫?????紊?罨≦????句Щ?????綣????鐚?JVM?櫆札?????ò份絎?篁サ??????????九葦??贋・菴???ヨ??綛岩撮???菴?筝?????医Û噲Serial???ParNew膈?紊???句??羈???????鐚?絲?Parallel Scavenge膈?筝?筝?絎??????????
+ 4. **??????綛顔????ゅ??**鐚???????篋?GC膊?羈?鐚?絋?Parallel Scavenge鐚?筝昭和????割戎羃≧??莨上?? `MaxTenuringThreshold`鐚?絋????Survivor??坂賢??後??綛顔???????????絲壕院?????糸ぇ絨鎀т??Survivor腥咲?雁??筝????鐚???d??綛顔??紊т?????膈?篋?莚ュ拘蘊????絲壕院箙?篌???贋・菴???ヨ??綛岩撮鐚???勛????壚減篋?絨遵辱??????Survivor腥咲?眼??
+21. ???絖?羈?羲???????絖?羣√?阪?阪????
+ 膈?鐚????絖?羈?羲??Memory Leak鐚???????絖?羣√?削??Memory Overflow鐚???壚犬腱?筝??????????絖???勰??鐚?篏???遵櫝?遵嚩??雁??綺???ц?巡??????????喝刊羣????
+ * **???絖?羈?羲??Memory Leak鐚?**鐚?
+ * **絎?箙?**鐚?腮?綺?????活噯???絖????鐚????篏睡??絎?罸????羃≧??罩g`?????常??絲取?頑???????????絖????羈?茴????罨≦?ñ?Ǎ?????膸下姦腱壔??
+ * **??????**鐚????絽御?夌??腮????莚姒??罸?絋?????????????膠誌??絋?HashMap, ArrayList鐚???炊????????絲壕院綣???Ǎ??????渇?下??IO羌??????井????菴??・???臀?膸?菴??・膈?鐚?篁g????肢?????莚?嚩??翫????????←羝???ょ?????
+ * **茵?ー**鐚???????腮?綺颷?茵???狗?翫????随???櫜?????絖?莇???ヨ??絨?鐚??櫝?遵嚩??翫??膸上??絖???????紊沿乾鐚????膸?綣???????絖?羣√?冴??腮?綺颷?茵????綺????????GC蘂????紜????鐚?GC??狗?翫????帥??
+ * **??????**鐚???炊??菴?茵????綺??????綺??櫝?巡?????筝阪??絖?羈?羲???????絨遵??絖?鐚???割戎??糸??絖????羆?綛倶????菴???ñ?????絖???????紊у?????
+ * **???絖?羣√?削??Memory Overflow鐚?**鐚?
+ * **絎?箙?**鐚?腮?綺???活噯??????絖?莇?菴?篋?膤紫???????醇??箴???????紊у??絖??????駈??絋?JVM?????????絖?筝???? `-Xmx`鐚????
+ * **??????**鐚?
+ * 腮?綺???セ昆???荀?紊?????????井?勰?颷?紊э??莇???坂??????????????絖????
+ * ??????篋????絖?羈?羲??膣夌Н???絲壕院??????篋?菴?紊????絖????
+ * ???筝?噲莟∴??紊э??絋?莇?紊у??膃?顕???莇?紊ф?亥?????莇?紊у噲莟≦?常??鐚?絲取?贋??羈??????î?????絖?筝上????????
+ * JVM?????? `-Xmx` 莅丞舟緇?菴?絨????
+ * **茵?ー**鐚?腮?綺??????? `OutOfMemoryError` 綣?絽醐??絋? `java.lang.OutOfMemoryError: Java heap space`???
+ * **??????**鐚????絽御?夌??綺鎦ð????????羈?膸х鮫菴?茵????
+ * **??阪????紫??**鐚?
+ * **??セ寒**鐚????絖?羈?羲????**???絖?膊∞??筝?綵?**絲取?翫??絖????羈??????駈?????絖?羣√?堺??**???絖????羆?莇????**絲取?贋??羈?????????医??絖????
+ * **??括鎧**鐚????絖?羈?羲????嚩??翫??絖?羣√?榊??絽梧????????箙?筝?鐚?篏????絖?羣√?坂???櫝?順?掩3絽悟????????羈????紊ч????井?勤噯羆?綣?莎件???Ŭ?虁????坂?????????????駈?????
+ * **????????倶??**鐚????絖?羈?羲???壩??菴?綣????鐚??????狗?雁姦腱姒?????絖?羣√?阪櫝?醇?夌????九????????鐚?絋?紊????筝?筝???紊ц噯羆?鐚?鐚?箙??櫝?醇?壩??菴?膣夌Н??井??筝?????弱???????????
+22. 篁?箙????tomcat膠糸??莉醇?阪?駈??
+ 膈?鐚?Tomcat???膠糸??莉醇?阪?倶???九???ー罔≦???????????胼紙?т札?????壩????右??讐/??上??莉順????渇?勰????????絎?綛狗??絎?????球妾JVM????????????篋峨??羇丈─???鐚??????虁??茵?篋???ï?????絎???駈??綵∽??篋????莪???????Tomcat膠糸??莉遵??絮?罨∞???????????
+ * **??後????????**鐚?筝坂??絎??ーWeb綺??????綺鋈???雁?????胼誌??篁ュ??綺????筝?Tomcat??後?????綺?????????≦??ッ紜?箙???雁?????胼誌??Tomcat絎?箙?篋?紊?筝?瓜???莉遵?Ǎ??罸鋇???莉遵????茣e??莉順?劫???????雁??膠祉??
+ * **筝肢??膠糸??莉遵??**鐚?
+ 1. **Bootstrap ClassLoader**鐚?JVM???研???綣?絲主瓜???莉遵?Ǎ?????莉?`JAVA_HOME/lib`筝??????後??Java膠糸??鐚?絋?rt.jar鐚????
+ 2. **Extension ClassLoader**鐚????莉?`JAVA_HOME/lib/ext`筝??????ï??膠糸?????
+ 3. **System ClassLoader (AppClassLoader)**鐚????莉遵???????綺????膠肢君緇?鐚?`CLASSPATH`鐚?筝????膠祉??Tomcat??セ昆篏?筝坂??筝?????Ǎ??箙????筝?筝?鎧膸?膠糸??莉遵????ュ??莉遵?倶?後???????順瓜???
+ 4. **Common ClassLoader**鐚?Tomcat??号?????鐚????篋????莉?Tomcat???昆篁ュ????????Web綺??????延昆???膠誌??絋?servlet-api.jar鐚????絎?篏?篋?膤紫??膠糸??莉遵?????WebApp ClassLoader箙???眼??
+ 5. **Catalina ClassLoader**鐚????篋????莉?Tomcat Catalina罔≦??鐚?Servlet絎劫????後??鐚????膠誌??菴?篋?膠糸噲Web綺??????絽御?壚???櫝?????鐚?絎??ー絎劫??筝?綺?????????胼祉??
+ 6. **Shared ClassLoader**鐚???ð???????ロ??Tomcat 7???箙????鐚?絖???Ǎ?????篋????莉醇?????Web綺??????延昆篏?筝?絮?篋?Common絮????膠祉?????Tomcat 8???箙????鐚???九????初??絽悟??Common ClassLoader???WebApp ClassLoader?????九??莉遵????炊?????
+ 7. **WebApp ClassLoader**鐚?罸鋇?Web綺?????醇??筝?筝??ス?????WebApp ClassLoader???菴????Tomcat絎??ー綺??????胼紫????渇?勉??絎?茣?茣e??莉?`WEB-INF/classes`???`WEB-INF/lib`筝????膠祉??絎???????莉順????ユ?姒??**???絨?莚????訓???莉緒??絎??ー?????ŭ絃?????????絖ï??篌???????鐚?鐚?絋??????鞘????逸?????紮????膸???九??莉遵?Ǎ??Common/Catalina膈?鐚?**???菴??????岩?????篋峨??羇丈─???鐚?隋勌??筝????綺?????櫆札篏睡???後??膠糸?????筝?????????ロ??絎??ー???胼祉??
+ 8. **JasperLoader**鐚????篋????莉?JSP膽?莚?????????????Servlet膠祉??綵?JSP???篁区←篆勖?劫??鐚???х??JasperLoader篌?茴?権綣?鐚????綮堺?亥??JasperLoader??ュ??莉醇?亥??Servlet膠誌??絎??ーJSP?????右??莉純??
+ * **??合??**鐚?
+ * **?????翫??篋峨??羇?**鐚?筝肢?????WebApp ClassLoader???JasperLoader鐚?絎??ー綺??????胼糸????右??讐???
+ * **絮?罨∞?????**鐚????膠糸??莉遵???????????莉順?劫???????筝????膠祉??
+ * **???胼紙??**鐚?筝????Web綺????箙???眼??綺????筝?Tomcat??後??箙???顔??菴?膠糸??莉遵??絎??ー膠糸?????胼祉??
+23. 篋?茹i????後?????????????鐚?
+ 膈?鐚???夌??鐚??????後?????鐚?Escape Analysis鐚???夌ー篁?JVM鐚?絋?HotSpot鐚?筝下??筝?蕁拷??荀????篌?????????壔??
+ * **絎?箙?**鐚??????後???????壩???????莚???????菴?茵????鐚?HotSpot筝肢???????恰?句??莚???? - JIT Compiler 筝左??茵?鐚???????絲壕院???綣????????器????ゆ?TEL??筝?噲莟∞??篏??????????????????????呉????阪???????号?????膾睡?????
+ * **??ゆ?中?????**鐚?
+ * **??号????????**鐚?絋????絲壕院茴???筝阪????遺?????膸???銀????号??鐚???????茴??????膸?莪??????鐚????莅や減??????篋???号???????吾??
+ * **膾睡????????**鐚?絋????絲壕院茴?絖??????医?????絖?鐚?絋?絎?箴???????????????????????鐚???????茴????絽???医?銀??膾睡???櫝???????井?刻??絋???延昆??井?勛?????鐚?鐚????莅や減??????篋?膾睡???????吾??
+ * **??勛??**鐚?絋????隋???筝?筝?噲莟&gt;??篌????????????醐????喝噲莟∞??篏???????篁????篋?綵??????号?????鐚?筝??Û??綵????膾睡?????茴?倧??卡??鐚?JVM絨怨櫆札絲壕??筝?噲莟∴??茵?菴?筝?罩ョ??篌???????
+ * **篌???????罧?**鐚?
+ 1. **???筝???????鐚?Stack Allocation鐚?**鐚?絋????絲壕院筝??????後?堺?号??鐚?JVM?櫆札絨???九???????????絽э??Stack Frame鐚?筝昭和?????筝??????筝??????号????ц??絎?罸?鐚????絽у執??削??絲壕院??????????駈????水??篋?GC?????????
+ 2. **????????炊????Scalar Replacement鐚?**鐚?絋????絲壕院筝??????醐??筝???九?????絖?罧灸??紊?鐚?JVM?櫆札絨?絲壕院???茹d減??句???????????紮?膠糸??絖?罧居?????????鐚???贋・絨?菴?篋?絖?罧球???????????筝????絲?絖????筝昭和??絎?????水??絲壕院??????綮阪??膊∞?????
+ 3. **???罩ユ????わ??Lock Elimination鐚?**鐚?絋????隋???絲壕院筝???????罩ラ??鐚?絋?`synchronized`???鐚?筝?篌???????腴?篋?鐚????筝阪噲莟&gt;???????醐???Û??綵????膾睡??篏睡?Ǎ??鐚?JVM?櫆札羔???よ??篋????罩ユ??篏?鐚????蕭?綛九????ц?純??
+ * **?ァ??九?????**鐚?
+ * `-XX:+DoEscapeAnalysis`鐚???夌??????後?????鐚?藥?莅ゅ????姒?????
+ * `-XX:-DoEscapeAnalysis`鐚?胼????????後????????
+ * `-XX:+PrintEscapeAnalysis`鐚??????育????後????????膸????鐚????篋?莪?莚?鐚????
+ * **絮???????**鐚??????後?????綛狗??筝???緒????九?????膸??????????隋勖?т??莎?篋?腮?綺鋌g?????紊????綺???JIT膽?莚??????????????遵?????絲剛??紊????絲壕院?????鞘札隋????????悟?倶??????????居??篌?????櫝?醇??羈?菴?茵????
+24. 莪????System.gc()篌???????篁?箙??
+ 膈?鐚?莪???? `System.gc()` ??? `Runtime.gc()` ??壚??筝?**綮肴佈**鐚?hint鐚????**莚傑??**鐚?request鐚?鐚?綮肴佈JVM菴?茵???句ッ紜???ц???????上????吟??JVM**筝?篆?莚?**筝?絎?篌?腴???恰?ц??GC鐚???隙??茵?筝阪????割??JVM???絎??ー???綵???????菴?茵???倶?????
+ * **?櫝?遵??????????????**鐚?
+ 1. **茹???Full GC**鐚?紊у????井????灸??鐚?莪???? `System.gc()` 篌?茴?JVM茹i??筝咲??荀?菴?茵?筝?罨≦????雁???????上????駈??Full GC鐚?鐚???喝????九????倶?亥??篁c?????綛岩撮??????腥咲?器?????羂娯??篁o??????????障??菴??????筝肴??????????絽御???????絖?膣у?????絽?????????乗??羣???区????Ǎ??Full GC??醇??紊х??綺??医????九??絖????
+ 2. **紜????GC??????**鐚???割戎JVM筝?腴???恰?ц??GC鐚?菴?筝????????セ昆箙?篌?紜????JVM????????割??GC?????ゆ?右?肢??鐚??櫝?醇?翫辱??域Е??????膸下??GC???
+ 3. **綽順?ヨ噯羆?**鐚?JVM絎??????????綽順?ヨ??筝?噯羆?鐚???劫??????????絖????莇潟??GC??????筝?紊ф?????罩e????ц????銀????渇?勌算??≧?吟??
+ * **羈???鋋?蕁?**鐚?
+ * **筝?篆?莚?腴???恰?ц??**鐚?綣???????筝?綺?箴?莎? `System.gc()` ??ョ仮隋勖ァ???GC??倶?冴??
+ * **?櫝?巡婚?????ц?遵?????**鐚?絋????JVM??喝?????綺?菴?筝?噯羆?綛倶?ц??Full GC鐚?篌?絲取?贋?乗????????蕁随??STW鐚?鐚?綵怨??腮?綺???ц?純??蘂?膵?莪?????櫝?遵噲??ц?巡婚???茣???√襲??????
+ * **???絽娯??綮肴佈???????????**鐚??ー篁?JVM???GC膊?羈?鐚?絋?G1, ZGC鐚?綏牙????後????肴?緒????遵????号?????????綺????菴?茵???九?笈?????????GC膈???ワ????????????? `System.gc()` 緇?緇??????篏????鐚??????喝櫝?初??緇???九??????Ŭ????????絨???亥?劫????堺?壚??鐚?絋????篋?JNI???篏???????荀????隋勰????乗??羣?鐚?鐚?????櫝?処?????篏睡?????
+25. 莪?莪?Minor GC??&gt;散鐚?full GC??&gt;散
+ 膈?鐚?菴?筝??勰??筝???勰??16???????????????鐚?菴???????菴?茵?罌括?????茵ュ??鐚?
+ * **Minor GC鐚???亥??篁?GC鐚?茹?????&gt;散**鐚?
+ 1. **Eden??堺察**鐚?菴???壩????後??????????贋・???茹?????&gt;散???綵???医??綮榊??絲壕院???羈????Eden??阪????????絖???駈??Minor GC絨延??茴?Е????????句?勛??????????Eden??坂札???From Survivor??坂賢筝????絖?羇紫??絲壕院鐚?綛九??絖?羇紫??絲壕院紊???九??To Survivor??冴??
+ 2. **??坂??GC膊?羈????膈????**鐚????篋?GC膊?羈?鐚?絋?Parallel Scavenge鐚??櫝?巡????号?勛?勖???????????????????倶?????膈???????膈???ユ?ユ?????茹???Minor GC鐚?筝?筝?絎????緇?膈????Eden??阪?????紂?羯&lt;??
+ 3. **System.gc()莪????**鐚???順?銀??篆?莚??ŰЕ???Minor GC鐚?篏???????篋?絎??ー?????劫???????灸??鐚?箙??櫝?処Е???Minor GC???
+ * **Full GC鐚?絎????GC鐚?茹?????&gt;散**鐚?
+ Full GC???噲??岩肩???鐚??????シ?亥??篁c?????綛岩撮鐚?篁ュ???櫝?遵??????????腥咲??/羂娯??篁g??絎???翫????駈?????絽娯軸??颴???睡??STW???茹?????&gt;散??翫?????鐚?筝肢???????ロ??
+ 1. **???綛岩撮腥咲?岩??莇?**鐚?
+ * Minor GC???鐚????紊ч?鎛壕院???荀?????????域??綛岩撮鐚?篏????綛岩撮??î??腥咲?岩??莇割札絎合些菴?篋?絲壕院???
+ * ???綛岩撮??セ昆腥咲?頑??絨緒?????羈?????????亥??紊у噲莟≧????亥?????
+ 2. **???腥咲??/羂娯??篁gÃ??岩??莇?**鐚????莉順??膠私拭??夌???????井?????????腥咲?頑??菴?篋?莅上?????筝????鐚?`-XX:MaxMetaspaceSize` ??? `-XX:MaxPermSize`鐚????
+ 3. **Minor GC??句??腥咲?翫????????篆?紊沿乾鐚?Promotion Failure鐚?**鐚??????茵?Minor GC???鐚?JVM篌?蘂????罍???ヨ??綛岩撮??î??腥咲?贋????恭紊?絖???丈?シ?Minor GC蘂?????????????絲壕院???絋????罍???ュけ茣ワ????括Ã??岩??莇鰹??鐚?筝坂??篆?莚????絖?絎???Ǎ??篌???贋・茹???Full GC??ヨ?上?肴??綛岩撮腥咲?器????九?????絨?莚?Minor GC???
+ 4. **System.gc()莪????**鐚?綣榊??綮肴佈JVM??ц??Full GC???
+ 5. **???腥咲??/羂娯??篁e????上?????**鐚???順?銀??蘂?膵?鐚?篏???????腥咲??/羂娯??篁gÃ??雁冠綣???駈??箙?篌?菴?茵??????上????銀札?????鞘?????篏睡????膠糸??莉遵???????九??莉順??膠私拭??壔??
+ 6. **CMS GC?????号????????**鐚????CMS?????丈?狗?????筝昭和???櫝?巡?????筝財??Concurrent Mode Failure???鐚?綛九??罔≦?鎀沿乾鐚???喝攻??????莅育?倶侊???綛岩撮腥咲?岩??紊???Ǎ????????Promotion Failure???鐚???????紊沿乾鐚????莨上?謂??InitiatingHeapOccupancyPercent???鐚????紮???????????上??罸?鐚?膈???&gt;散茹???Full GC鐚?絎????筝????CMS???Remark??倶侊?????九??????????駈?????
+ 7. **G1 GC?????号????????**鐚?G1 GC??????訓???茹???Full GC?????&gt;散鐚?箴?絋?綵?綛九??GC???羈?羯∴恭?????句?勖???????????絖?篏睡????菴??????寂?????羈????菴?綛九???????倶察莇潟?????????????????Evacuation Failure???鐚? evacuation 紊沿乾鐚?膈????
+ ??紫????ヨ?鐚?Minor GC筝肢????恰絵??亥??篁g???????駈?????絽悟??Eden??堺察茹???鐚????Full GC?????絮???х???????駈??茹?????&gt;散??翫????件?????絽娯?????綛岩撮??????腥咲?雁Ã??岩??莇潟??膤紫??莚傑???????劫??GC膊?羈????紊沿乾?????潟??
+26. Stop The World 篋?茹h?????鐚?
+ 膈?鐚?Stop The World (STW) ??壩???????茵??????上????駈??GC鐚???駈??JVM篌?????????????????????欠鎖腮?鐚?綺??????綺靮睡??鐚?鐚?莅?GC膾睡????遵??絎???????蕭??????井?ц?????絖??????九轡篏????菴?筝???????????器??綺??????綺鋇?篌????綺?篁私??莚傑??鐚?絲取?贋????&gt;賢??KK??STW?????狗?顔?睡?中?虁 ???GC??ц?順??筝?筝???荀???????鐚???狗?頑????昭和??絲劫???????綺????綵怨??莇?絨????筝????????????丈?狗????????筝???????STW膈???ュ?????膸中?狗?眼??箴?絋?鐚?Serial GC???Parallel GC???紊ч??????????狗?倶侊??初??荀?莨???炊?狗?雁??STW鐚?CMS GC莚???上??STW??狗?雁而??昭和??筝肢????????紮????莅医???????井??莅育?倶侊???STW鐚????G1???ZGC膈??ー篁?GC?????翫??篋?絨?STW??狗?贋ァ??九???????昭和??罸???膾х????恰?岩??鐚?綛銀????後噲腮喝?????
+27. 莪?莪?篏?莅よ??紊?絨?腱?OOM鐚?絋?篏???水??OOM?
+ 膈?鐚?絽梧?????OOM鐚?OutOfMemoryError鐚?膠糸???????ロ??
+1. `java.lang.OutOfMemoryError: Java heap space`鐚???????絖?筝?莇潟?????絽御?夌?延?????綮坂??菴?紊?絲壕院鐚???????絖???????絖?羈?羲??絲壕院筝????篏睡??篏?篁???区←綣???Ǎ?????羈?茴?GC?????駈?????
+2. `java.lang.OutOfMemoryError: PermGen space`鐚????JDK 7???箙????鐚????篏睡??-XX:+UseParallelOldGC??九櫝?初????逸??鐚???号????削??羂娯??篁o?????絖?筝?莇潟?????絽御?夌?延?????莉巡??紊???膠誌??絋?罅???吟????????篁g????????絨?膈?鐚?鐚???????絽檎?閺?菴?紊с??
+3. `java.lang.OutOfMemoryError: Metaspace`鐚?JDK 8???箙????鐚?鐚????腥咲?翫??絖?筝?莇潟?????腥咲?岩戎?????サ?医??絖?鐚?絋???????莉順??膠私拭??壔??絽檎?靁?菴?紊?鐚??櫝?遵嚩??翫??腥咲?贋頃??冴??
+4. `java.lang.OutOfMemoryError: Direct buffer memory`鐚???贋・???絖?鐚?Native Memory鐚?筝?莇潟?????絽御?夌?延??篏睡??篋?NIO鐚?New I/O鐚?筝下??ByteBuffer.allocateDirect()??????篋?紊ч????贋・???絖?鐚???????篏睡??Netty膈?罅???倶?倶??????狗????障??
+5. `java.lang.OutOfMemoryError: GC overhead limit exceeded`鐚?GC?????倶?????菴?篏????綵?GC??沿換篋?紊ч????狗?器??藥?莅よ??菴?98%?????狗?器???Û????銀??絨???????絖?鐚?藥?莅ゆ?閩≦????九???櫜?????絖?絨鋋?2%鐚?鐚?JVM篌??????堺4???莚姒????我2腮?綺???桁?モ??GC-膈?緇?-???GC??????罩糸妾?ッ???
+6. `java.lang.OutOfMemoryError: unable to create new native thread`鐚????羈????綮堺?亥????サ?亥鎖腮???????絽御?夌?延?????綮坂??菴?紊?膾睡??鐚???????膾睡?????紊у?顒丞舟菴?紊э??絲取?翫櫜????サ?医??絖?筝?莇割札???綮堺?亥鎖腮????
+ ??水??OOM?????号??鐚?
+1. **????ァ筝?蘂?茘?**鐚?篏睡?????ァ綏ュ?件??絋?JConsole, VisualVM, Prometheus+Grafana鐚?絎???句???ァ???絖?篏睡???????居??莅丞舟?????守??茘???
+2. **??????莅丞舟??????絖?**鐚???号???????絎???????羆?鐚???????莅丞舟-Xms鐚????紮????紊у??????-Xmx鐚????紊у??紊у???鐚???水??菴?紊ф??菴?絨???????絽後産莅?-Xms???-Xmx莅丞舟??後??鐚???水????????莪???翫研??ョ????ц?遵????????
+3. **??水?????絖?羈?羲?**鐚?篁?膸?罍???ヤ撮???鐚?隋勌??筝????篏睡????絲壕院??遵??茴?GC?????吟??羈???????箴???????????????????篋?篁句????サ????????絮?膠紫??絎号????????綣??????篁g?????
+4. **篌??????井?勛?????**鐚??????ï??????????井?勛?????鐚???水??筝?綽?荀????紊у噲莟≧???????????
+5. **?????狗????乗??羣?**鐚?絲剛??筝????篏睡????莎?羣?鐚?絋????篁九媳???????井????菴??・???臀?膸?菴??・???紊у噲莟∞??鐚?鐚?荀??????九?渇?中??臀勛Ã???
+6. **莪????GC膈???ュ????????**鐚???号????????合?刻??絋????綺???狗?贋?????綺???????????頳?羆?鐚?鐚??????ï?????????????丈?狗????Ǎ??絋?G1, ZGC鐚?綛区????雁?後?喝????逸??絋???亥??篁?/???綛岩撮罸?箴???? Survivor??堺??箴????GC茹????????主??鐚????
+7. **?ァ??句鎖腮???育??**鐚????????ァ??句鎖腮?羆?紊у?????水?????綮肴??紊?膾睡?????
+8. **篏睡???贋・???絖???区姶???**鐚?絋????篏睡???贋・???絖?鐚?羈??????????????????丞????倶?削????水??羈?羲????
+9. **篁g??絎≧?ヤ??羌?莚?**鐚?菴?茵???????羌?莚???????絖?羈?羲闈?莚?鐚??????ï???ー??勰?????
+28. 篋?茹h??JVM莪?篌?羃\????堺?シ??莊壩?壚??箙??絋?篏?隋???絎?篁ス??紊у???????
+ 膈?鐚?篋?茹?JVM莪?篌??????堺?シ??莊奝??絽後????ロ??
+1. **??勰??絎?篏?**鐚?薤???????荀????隋勤??篌??????勖??鐚???虁В??恰?ц?順?狗??鐚?絋?CPU??????????????綺???狗?顔?随??菴???虁В??喝??絖???勰??鐚?絋?OOM???GC蘂?膵?鐚????篏睡?????ァ綏ュ?件??絋?jstat, jstack, jmap, Arthas, VisualVM膈?鐚???狗??菴?茵???倶?井?卡????????GC??ュ??鐚?絎?篏???勰????号??鐚????CPU莅∞??絲??????????IO絲???????鐚?菴??????絖???????/?????狗?勰??鐚????
+2. **?????ï????????GC**鐚???号?????????堺?姒??蕭?????????????篏?綮区????????絖???????膈?鐚??????ï?????????????丈?狗????????箴?絋?鐚?絲劫散菴?????????????鎖?????≦櫝?初?????CMS???G1鐚?絲劫???????頳?羆?蕭??????劫?????篁糸?≦櫝?初?????Parallel GC???
+3. **莪???翫?????絖?紊у??**鐚?莅丞舟???????????????紮?紊у???-Xms鐚???????紊уぇ絨??-Xmx鐚????筝???サ???????夌??綺????恭紊????腥咲?頑??茵?鐚?篏?筝?荀?莇?菴???ñ?????絖??????駈????水??蘂?膵???????絖?篋ゆ????Swap鐚???????絽後産莅?-Xms???-Xmx莅鞘減??後????種????鎞???????莪???雁??綣???????
+4. **莪???翫??絖???阪??罸?箴?**鐚?莅丞舟??亥??篁e?????綛岩撮???罸?箴?鐚?-XX:NewRatio鐚?鐚?Eden??阪??筝や肩Survivor??榊??罸?箴?鐚?-XX:SurvivorRatio鐚??????亥??篁eぇ絨鏄怨??Minor GC???蘂??????????綺??????綛岩撮紊у?鏄怨??Full GC???蘂??????????綺??????荀???号??噲莟∞????遵???????合?壕??茵?莪???眼??
+5. **篌????GC??????**鐚????絲合?劫??GC菴?茵??????域??篌?鐚?絋?CMS???綛九??膾睡????違??G1???Region紊у???????勖?????蕁炊?狗?雁?????
+6. **篁g??絮???≫?????**鐚?篌????篁g????肢??鐚???鎞?筝?綽?荀????絲壕院???綮削????水?????絖?羈?羲??篏睡?????????????井?勛????????膊?羈????
+7. **???膸下???ァ筝?菴TEL撮**鐚?莪?篌?筝???壚??罨≧?х??鐚????荀????膸下???ァ綺??????茵???倶??鐚???号?勛???ァ膸????????????桁??薤?鐚?筝???左????翫??篌?????????違??
+ 隋??????紊у???-Xmx/-Xms鐚??????号??鐚?
+1. **膸駚?羈????**鐚?絲剛???????阪????Ǎ?????絽後産莅???紊у?顒丞舟筝阪櫜???ñ?????絖????50%-80%鐚?篏?荀?隋勌?????莇喝????????絖????膸????篏?膤紫???????銀??菴?腮?鐚?綛狗?水??Swap?????隙??罸?箴????荀???号????????号?у???????≦????臀勤????眼??
+2. **??????羌?莚?**鐚????罔≧?????篋хッ紜?茣?莉順???????灸??菴?茵???????羌?莚?鐚?茹?絲????絖?篏睡??絣医?若?????罩ュ?????茣?莉緒????上?医??絖?篏睡???????腮喝??紜???粋????随????九??莅丞舟筝?筝??ラ??篋?絣医?種??絋?絣医??+10%-20%鐚???????紊у?鋎?筝?-Xmx????????区??絲?GC茵?筝削??絋????GC菴?篋?蘂?膵???????蕁炊?狗?頑????随???櫝?初??荀?莪???翫??紊у?????GC?????違??
+3. **??サ?鋍亥??**鐚????筝?篋?篌亥????サ???絋? `???紊у?? ??? (綛喝??絲壕院紊у?? * 絲壕院??育??) / ???膽ï??絖?`鐚?篏?菴????絽御??莨?膕???ワ?????荀?膸????絎?????????笈????眼??
+4. **????ァ??????**鐚????菴???炊?狗?頑??茵????綺???????ァ??井?卡???????????絖?篏睡??罔≦?????上?阪??絖????羆????絣医?弱??綛喝????種??篁ユ4篏?筝肴倘臀???紊у??????????????
+ 隋?????亥??篁e?????綛岩撮罸?箴?鐚?-XX:NewRatio鐚????Eden/Survivor罸?箴?鐚?-XX:SurvivorRatio鐚??????号??鐚?
+1. **絲壕院?????遵???????????**鐚???????綺????筝上噲莟∞???????遵????????絋????紊ч?????絲壕院??壎????????紊???No??鐚???括????遵?????緇???昭和??鐚?????櫆札紜?紊ф?亥??篁f??箴?鐚???鎞?NewRatio??種??鐚???鎞?Minor GC蘂???????絋????絲壕院?????遵?????莨???随??????櫆札???綵?紜?紊ц??綛岩撮罸?箴????
+2. **GC??ュ????????**鐚????菴???????GC??ュ??鐚?茹?絲?Minor GC???Full GC???蘂????????????銀札???????????域??綛岩撮???絲壕院紊у?????絋????Minor GC菴?篋?蘂?膵?鐚??櫝?醇?亥??篁eお絨??絋????Full GC蘂?膵?筝?筝肢????掩?????紊沿乾綣?莎件???櫝?処??綛岩撮紊????????亥??篁eお紊у嚩??頑??紊?絲壕院?????????
+3. **膸駚????**鐚?藥?莅ゆ????灸??鐚???亥??篁e????????1/3鐚?NewRatio=2鐚?鐚?Eden??阪????亥??篁g??8/10鐚?SurvivorRatio=8鐚????菴????絽御?壚??筝ŭ????????莎欠?刻???櫆札??号????????????笈??茵?莪???眼??箴?絋?鐚??櫆札絨?莚?絨???亥??篁f??箴?莪???岩減40%-60%???
+4. **???罩ヨ?????**鐚?篁?藥?莅ゅ?惹??膸駚???弱??紮?鐚???号?勛???ァ???GC??ュ??茵?ー鐚????罩ヨ????贋??箴?鐚?茹?絲?絲?GC蘂??????????蕁炊?狗?翫????岩????ц?順??綵怨?????
+29. 羞?絎???右????????篆≧????JVM??ŭ肩???絖???阪??
+ 膈?鐚?羞?絎???右????????篆≧?姒??篏?筝肴??茵???狗??荀?紊?????????井?卡????九噲莟≦??箴????絽後????????JVM???**???鐚?Heap鐚?**???絖???阪???????隙????ヨ?鐚?
+* 絋????菴?篋???????篆≧??噲莟≧?夌?中??絖??????鐚?箴?絋?鐚???????筝?噯羆?紊????菴?腮?筝上??綮阪攻緇?綽??????篏睡?Ǎ??鐚?絎?篁コ??薤?????????????????????亥??篁o??Young Generation鐚????Eden??冴??
+* 絋????菴?篋?絲壕院絖?羇紙?狗?雁????随??箴?絋?鐚?茴???上?ョ??絖????篌?莚?筝昭和??鐚?絎?篁コ??膸????筝?罨≧??紊?罨?Minor GC???鐚?絋????篁???九??羇誌??篌?茴?Щ?????井?亥??篁g??Survivor??削?????膸??櫝?処←??????鐚?Promotion鐚???域??綛岩撮鐚?Old Generation鐚????
+* 筝?菴?篋???????篆≧??噲莟∞?後?括??膠糸??箙?鐚?絋???????膠祉????颷亥瓜膈?鐚?????????井?卡??Method Area鐚?篌?絖???????**???腥咲?器??Metaspace鐚?JDK 8???箙????鐚?**???**羂娯??篁o??PermGen鐚?JDK 7???箙????鐚?**筝KK??
+* 絋????紊??????????篆≧?壩?銀戎???篋?膾睡??鐚?膾睡????????絽э???????サ?????????????????篏???井??膈?鐚?篌?絖???????????????**???鐚?Stack鐚?**???絖?筝KK??
+* 絋????篏睡??篋???贋・???絖?鐚?箴?絋?鐚????菴?NIO菴?茵?紊ф?井?勌??莨?鐚?鐚???後?割拭??壚??絖???????**??サ?医??絖?鐚?Native Memory鐚?**筝KK??
+ ???罩わ????????篆≧?壩?セ昆?????井?勌源荀????**???**筝KK??
+30. 絖??????????膽?莚?菴?腮?
+ 膈?鐚?Java絖??????????膽?莚?菴?腮?筝肢?????筝坂犬筝??倶侊鐚?
+1. **羣?篁g??膽?莚?鐚?膽?莚???駈??**鐚?
+ * 綣???????膽????`.java`羣?篁g?????篁吟??
+ * 篏睡??Java膽?莚???Ǎ??`javac`鐚?絨?`.java`???篁句??莚????綛喝佀????括??絖???????鐚?Bytecode鐚?鐚?莨???坂減`.class`???篁吟??
+ * 菴?筝??倶侊筝肢??菴?茵?莚中??罍???ャ??莚TEL???????????篁g??篌????鐚?絋?絽檎?????????????サ?怨??茵?松綣闉???ょ??鐚?鐚?綛九??蕭?膾х??Java莚左????号?ц習??≫減??坂???????????篁ら??鐚???喝????????鐚????絖?????????壚??腱?筝右?頑;腓削????????????号?????絖?罧泣??膠紫?????膈?篆≧?姒??篏?菴?筝???順?贋・茴?綺?絮?隋コ散??ц?????
+2. **絖???????茹i??筝???恰?句??莚?鐚?菴?茵???駈??**鐚?
+ * 綵?Java腮?綺颷?茵???駈??JVM???莉?`.class`???篁吟??
+ * **茹i????ц??**鐚?JVM筝下??茹i????Ǎ??Interpreter鐚??????∴嚞???絖??????????篁わ??綛九????句浸莚????綺?絮????篏?膤紫?????隋コ散??順??茹g????阪??????ユ?ц?????菴?腱???劫???????綽???篏???ц??????????後噲莨?篏????
+ * **??恰?句??莚?鐚?Just-In-Time Compilation, JIT鐚?**鐚?筝坂?????蕭???ц????????鐚??ー篁?JVM鐚?絋?HotSpot鐚?篌?????ァ篁g???????ц???????泣??絲剛??蘂?膵???ц??????????下?剛撮??????鐚?Hotspot Code鐚?鐚?JVM?????恰?句??莚???Ǎ??絋?C1, C2鐚?篌?絨?菴?篋?絖???????膽?莚??????サ?井?阪????鐚?綛句??絖?莎傑?ャ??筝?罨≧?ц????駈????贋・菴?茵?膽?莚?絅順????サ?遺撮???鐚????綺???綽???茹i????ц?????JIT膽?莚?篌?菴?茵???贋??菴????篌????鐚?絋??????????緇?ッ絮?綣?????????後?????膈?鐚????
+ ??紫????ヨ?鐚?絖???????膽?莚?菴?腮???壚??篋榊瓜?櫝嚞???Java羣?篁g?????JVM?櫐?ц?????筝右?贋??篁わ??絖???????鐚?鐚??????井??膸????JVM茹i?????膽?莚??????サ?井?阪??????ц?????菴?腮????
+31. Java???荀?綣????篋阪???????九??絖??????上??鐚?
+ 膈?鐚????Java筝昭和??**???絽娯?????荀?**綣????篋阪????上????医????九??絖??????障??Java莚左?????莅乗?≦??茵隙??筝?絨掩?奝??菴?????????絖?膊∞????ヨВ??上?????篋阪??鐚???水???????????絖?膊∞??鐚?絋?C/C++筝下??`malloc`/`free`???`new`/`delete`鐚?絽??ョ??紊??????у??絎号????咲???????勰??鐚?絋????絖?羈?羲??????サ????????膈?鐚????
+ Java????????上????九?Ǎ??Garbage Collector, GC鐚?篌????????茣h?????綛九????狗?d??筝????茴?綺??????綺鏁?????????絖?絲壕院???綣????篋阪???Ū??荀?隋勌??鐚?
+* 綵?絲壕院筝???????荀???駈??筝??????????絲壕唫絲壕院???綣???Ǎ??箴?絋?鐚?絨?綣?????????靷勌減`null`鐚???????莅ï噲莟∴????坂????????鐚????
+* ??水?????綮坂??綽?荀????絲壕院???
+* 羈???鋇?篋???号???????居??絋???????????????????箴?罔≦???????????瓜膈??櫝?遵嚩??雁??絲壕院綣???????羈??????常??篁????綣???????絖?羈?羲????
+ ??順?銀?????荀????????????駈??篏?綣????篋阪?????荀????茹?GC???綏ヤ????????鐚?篁ヤ梢膽??????堺?癌??GC???絅盾?????篁g??鐚?綛九????榊ー???絖???勰????区??茵?莚???上??莪?篌????
+32. Java筝上????上????倶??篁?箙???勛??鐚?篁?箙???九??菴?茵??????上????駈??
+ 膈?鐚?
+ **??勛??**鐚?
+ Java筝上????上????句??筝肢????勛???????ロ??
+1. **????????絖?膊∞??**鐚??????????鞘?????篏睡????絲壕院??????????????絖?鐚?茹f?上?????篋阪??鐚???鎞????絖?羈?羲??????サ????????膈????莚壔??
+2. **???絖?腥咲?翫????銀??紊????**鐚?絨??????句?????絖?腥咲?翫??菴?膸????鐚?箴???亥??絲壕院??????篏睡?Ǎ?????蕭????絖???ñ???????
+3. **??我2???絖?羣√??**鐚????菴?絎?????????倶?????絲壕院鐚???水????????絖?茴???絨緒??篁??????我2`OutOfMemoryError`???
+4. **篆???????絖?膸??????????**鐚????篋?GC膊?羈?鐚?絋????篁f?狗??鐚?菴?篌???雁?????絖?腥咲?器????鎞????絖?腆????鐚????蕭?絲壕院???????????????
+ **篁?箙???九??菴?茵??????上?????**鐚?
+ ?????上????句??茹?????倶?阪????割????隙??????????丈?狗??????????狗??臀卡??篏?絽梧?????茹?????&gt;散?????ロ??
+1. **??????絖?莨上?遺??絎???????**鐚?綵?Eden??削????亥??篁g??筝???????鐚????絖?篏睡??松??遺??絎?罸?箴?鐚????絽御??100%鐚???駈??篌?茹???Minor GC鐚?箙?腱?Young GC鐚?鐚??????倶?亥??篁d賢???綺?綣?絲壕院???
+2. **???綛岩撮腥咲?岩??莇?**鐚?綵?絨?莚?絨???亥??篁d賢???絖?羇糸噲莟≧?????鐚?Promote鐚???域??綛岩撮??駈??絋???????綛岩撮??î??腥咲?岩??莇割札絎合些菴?篋?絲壕院鐚?篌?茹???Full GC鐚??????サ噲??亥??篁c?????綛岩撮??????腥咲?雁??????√????駈???????????鐚????綛岩撮??セ昆???絖?篏睡??松??遺??絎??????惹?銀???櫝?処Е???Full GC???
+3. **???腥咲??/羂娯??篁gÃ??岩??莇?**鐚?綵????莉順??膠私拭??夌???????????腥咲??/羂娯??篁g?????絖?莨上?遺???????駈??篌?茹??????絲劫??腥咲??/羂娯??篁g???????上????吟??
+4. **膤紫????上?顓傑??**鐚?莪????`System.gc()`???`Runtime.gc()`??号??篌?綣榊??綮肴佈JVM??ц??Full GC鐚?篏?JVM筝?筝?絎?腴???恰?ц??鐚???隙??茵?筝阪????割??JVM絎??ー????????域倘臀卡??絋?`-XX:+DisableExplicitGC`?櫆札胼????罩ゅ????緒?????
+5. **GC膊?羈???劫????&gt;散**鐚?筝???????GC膊?羈??????句?劫?????茹?????&gt;散???箴?絋?鐚?CMS GC???綛九?????莅育?倶侊????ー??????紊沿乾鐚?Concurrent Mode Failure鐚???銀??茹???Remark??倶侊??????膸下???????駈??G1 GC篌???坂??Region????????銀桟??弱??????????????蕁炊?狗?贋?ュ?喝??篏???区??茵??????吟??
+ ??紫????ヨ?鐚?GC筝肢????????絖?膣у?????莨上?育??莅冗????惹?区←茹???鐚?篁ョ惨???JVM???腮喝??菴?茵????
+33. System.gc()???Runtime.gc()篌????篁?箙?篋????鐚?
+ 膈?鐚?`System.gc()`???`Runtime.gc()`絎????筝???夌????????鐚????筝?`System.gc()`??????絨掩?虁?????篋?`Runtime.getRuntime().gc()`???絎?篁サ?????篋??????姒??
+* **??????GC莚傑??篆≦??**鐚?菴?筝や肩??号??篌????JVM??????筝?筝?**綣榊??綮肴佈**??ц???????上????句??篆≦垩??
+* **筝?篆?莚?腴???恰?ц??**鐚?JVM??九?域??筝ŭ拭?垸??鐚?**筝?篆?莚?**篌?腴???喝?????????上????区??腮?????????札???篏???倶?ц??GC鐚????膸????JVM??号?勤??昆膈???ュ??綵??????倶????喝?????箴?絋?鐚?JVM?櫝?巡??綽順?ヨ??筝?噯羆?鐚???????膈?緇???翫??????????倶?阪????ц?????
+* **???絽梧Е???Full GC**鐚?綵?菴?筝や肩??号??茴????????駈??紊у????井????灸??篌?茹???筝?罨?**Full GC**鐚???喝噲??岩肩???鐚??????シ?亥??篁c?????綛岩撮鐚?篁ュ???櫝?処????????腥咲??/羂娯??篁h??茵?????∝???????上????吟??菴??????筝?Minor GC???絽御?夌??Eden??堺察?????Е??????鐚???????????????`gc()`緇?緇??????括??綣???????莅や減???荀?羝??????岩肩??????
+* **綵怨????ц??**鐚?綣阪?区Е???Full GC篌?絲取?翫???????綺靮睡????????鐚?Stop The World鐚?鐚??櫝?遵??莎傑????丞????ц?巡?????????????&gt;賢??KK?????罩わ??筝??ィ????????ц?醇???????????篋хッ紜?筝右????顖??????筝や肩??号?????
+ 膊????荐?箙?鐚?絎?篁サŬ?夌??JVM筝?筝ĵ???ー???唫羝?????????鞘???????????腓削??篏?JVM筝?筝?絎?篌???ケ??
+34. 筝糸??絖?筝?綏ヤ?????絖?
+ 膈?鐚?筝糸??絖?鐚?Main Memory鐚????綏ヤ?????絖?鐚?Working Memory鐚?箙?絽悟О筝榊鎖腮?????????サ?医??絖?鐚????Java???絖?罔≦??鐚?Java Memory Model, JMM鐚?筝下??筝や肩??後??网?綽居?????篋???颷亥鎖腮?箙???翫??篏????菴????絖?菴?茵?篋や?????
+* **筝糸??絖?鐚?Main Memory鐚?**鐚?
+ * 絮?篋?**??延昆???絖?**??阪?????
+ * ??????膾睡????延昆筝糸??絖????
+ * 絖????篋?Java絎?箴?絲壕院??????????????????膠私拭??夌????井?勉??
+ * ?櫆札???茹d減??ñ?????絖?筝昭和??茴?JVM??????膸?莚ヨ??腮?篏睡???????鐚?Heap鐚???????腥咲?器??Metaspace鐚?/羂娯??篁o??PermGen鐚?膈???阪?????
+* **綏ヤ?????絖?鐚?Working Memory鐚?**鐚?
+ * 絮?篋?**膾睡??腱????**??阪?????
+ * 罸鋇?鎖腮???ユ?????訓??ス?????綏ヤ?????絖????
+ * 綏ヤ?????絖?筝上?????篋?莚ョ鎖腮?篏睡????亥??筝糸??絖?筝下??????????壩?ロ???????サ??????????????????????延昆???????????壩?ロ?????
+ * 膾睡??絲劫?????????????????篏?鐚?莚糸?????莎???主??鐚???遵??蕁糸??綏ヤ?????絖?筝左??茵?鐚????筝???順?贋・莚糸??筝糸??絖?筝下???????????
+ * ?櫆札???茹d減??ñ?????絖?筝昭和??茴???????膸?膾睡??篏睡???????鐚?Stack鐚?腥咲?岩賢???????????阪?????
+ **篋や????括鎧**鐚?
+ 膾睡?????綏ヤ?????絖?筝?筝糸??絖?箙???顔??荀????菴???劫???????顒勤??茵???井????罩ワ??
+* **莚誌??Read鐚?**鐚?膾睡??篁?筝糸??絖?筝左嚞??????????????種??綛九????九???????医轡篏????絖??????壩?コ賢???
+* **???鐚?Write鐚?**鐚?膾睡??絨?綏ヤ?????絖?筝上??????????弱?傑?医??筝糸??絖????
+* **莉遵?ワ??Load鐚?**鐚?絨?Read???篏?篁?筝糸??絖?筝左嚞??????????????種????上?医轡篏????絖????????????壩?コ賢???
+* **絖???Ǎ??Store鐚?**鐚?絨?綏ヤ?????絖?筝上??????????種??篌??????遺源???絖?筝昭和??篁ヤ??Write???篏?篏睡?????
+* **篏睡?Ǎ??Use鐚?**鐚?膾睡??篁?綏ヤ?????絖????????????壩?コ賢莚糸?????????????種??綛句??篋???ц??綣???????
+* **莎???種??Assign鐚?**鐚?膾睡???????ц??綣????筝中?ц?????篏????鐚?絨?膸????莎???主??綏ヤ?????絖?筝下??????????壩?ケ??
+ JMM???菴?菴?篋????篏??????狗〆綺頵????鐚?絋?happens-before??????鐚???ヤ??莚?紊?膾睡???ッ紜?筝????絖?莅翠?勛???櫝????э??Visibility鐚???????綺???э??Ordering鐚?鐚???水?????膽?絖?筝?筝???雁????勰??絲取?雁????井?勛??篋???????莚壔??
+35. ???絖???岩困篋????篏?
+ 膈?鐚???号??Java???絖?罔≦??鐚?JMM鐚?鐚?膾睡?????綏ヤ?????絖????筝糸??絖?箙???雁??篋や?????篏?筝肢?????篁ヤ?????腱?鐚?菴?篋????篏??????絖????篏?鐚?鐚?
+1. **Read鐚?莚糸??鐚?**鐚?膾睡??篁?筝糸??絖?筝左嚞???筝?筝???????????若??菴?筝???篏??Ŭ?????筝糸??絖?鐚?膸????篌????篋????膸下??Load???篏????
+2. **Load鐚?莉遵?ワ??**鐚?膾睡??絨?Read???篏?篁?筝糸??絖?莚糸????亥??????????種?????莉遵?医轡篏????絖????????????壩?コ賢???
+3. **Use鐚?篏睡?Ǎ??**鐚?膾睡??篁?綏ヤ?????絖????????????壩?コ賢莚糸?????????????種??綛九????銀?????膸?膾睡???????ц??綣????鐚?絋?CPU絲?絖???Ǎ?????菴???夌鎖腮?絎????綣?紮????篏??????????膃コ??罩ャ??
+4. **Assign鐚?莎???種??**鐚?膾睡???????ц??綣??????ц??絎????篏????鐚?絨?膸????莎???弱??綏ヤ?????絖?筝下??????????壩?ケ??
+5. **Store鐚?絖???Ǎ??**鐚?膾睡??絨?綏ヤ?????絖?筝上??????????種??絖??????遺????≦?喝??????????遺源???絖????Write???篏?筝KK??菴?筝???篏??Ŭ?????綏ヤ?????絖????
+6. **Write鐚????鐚?**鐚?膾睡??絨?Store???篏?筝上??紊?絅順??????????種???????ュ?遺源???絖?筝KK??菴??????綏ヤ?????絖????篆勖?劫??罩ュ??筝糸??絖????罩ラĽ???
+ **???篏?絲劫?倶??**鐚?
+* Read???Load??壚??絲号??篏?鐚?Read篁?筝糸??絖??????種??Load絨???惹?上?ュ轡篏????絖????
+* Store???Write??壚??絲号??篏?鐚?Store???紊???弱??Store???篏?筝昭和??Write絨???弱????ヤ源???絖????
+* Use???Assign筝???壚献??主??筝?絲刻??Use??虁嚞?????壩?サ?主????ц??綣????鐚?Assign???????ц??膸????????????壩?ケ??
+ **??ц??蕁阪??**鐚?
+* 筝?筝?????鋇???処←???筝?筝?鎖腮????Read???Load???篏?莅翠?勌犬罨\??箙?筝???処←???筝?筝?鎖腮????Store???Write???篏?莅翠?勌犬罨\????ら???????銀????翫?????篋?Assign???篏????
+* 筝?筝?????????Assign???篏?箙????鐚?綽?蕁糸????九??膸下??Store???Write???篏?箙?????????????
+* Use???Assign???Read???Load???Store???Write箙???翫櫝?遵??????????綺??篏?JMM???菴?happens-before??????膈?茹??????ラ????区??腱???????綺??篁ヤ??莚????絖?筝???贋?с??
+ 菴?篋????篏????JMM??颷医??膾睡?????絖?篋や???????榊??鐚?隋勌??篋??????処院絮???≫??膾睡?????篏???延昆?????????罩g`??с??絎???????隋コ散絎??ー?櫝?巡?????膽?絖????羌?羂雁鎖膈???阪?駈??JMM絮???巡??菴?篋?膸????鐚????箴?篋?膸?筝???????絖?莅翠?勖─??????
+
+絅順??鐚?膸х鮫???膈?鐚?
+36. volatile 胼?罩√??絖???????綺????
+ 膈?鐚?`volatile` ??渇??????? Java 筝TEL源荀????篋?篆?莚???????????櫝????у??胼?罩∽??篁ら?????綺????
+* **?櫝?????**鐚?綵?筝?筝?鎖腮?篆勖?剛?? `volatile` ???????????種????医?寂??腴???活←?????ヤ源???絖?鐚???銀??膾睡?????嚞???莚ュ???????駈??篌?篁?筝糸??絖?筝右????域嚞???鐚?隋勌???????亥????壩????医?若??
+* **胼?罩∽??篁ら?????綺?**鐚?Java ???絖?罔≦??鐚?JMM鐚????莅悟??莚???????紊???????筝坂??篌??????ц?処??絲号??篁よ??茵???????綺????`volatile` ?????????莚紙??篏??????????篏?篌?綵∽??筝?腱???????絖?絮???????鐚?Memory Barrier鐚?鐚???紙2膽?莚???????紊???????絲? `volatile` ?????顒翠?勖??篁ゅ??????????勰??莚糸?????篁よ??茵???????綺????菴?隋勌??篋???? `volatile` ?????鋈??????????篏?筝?絎?篌??????銀???????ц??鐚?箙??????????篏?筝?絎??????銀???????ц??鐚?篁????篆?莚?篋?紊?膾睡???ッ紜?筝????篋???劫??篁g??????????ц??蕁阪?????
+37. ???絖?罔≦??筝?紊х?号?с??
+ 膈?鐚????絽梧丨筝削?????絖?罔≦??鐚?Memory Model鐚?筝肢??羔????篁ヤ??筝?紊х?号?э?????篋???颷医??膾睡???ッ紜?筝????絖?莅翠?勛??茵?筝阪??篆?莚?鐚?
+1. **???絖???? (Atomicity)**鐚?篆?莚?篋?罸鋇??堺?シ??篏?鐚?絋?莚糸??????????ヤ??筝???????荀?箙?絎??????ц??鐚?荀?箙?絎????筝???ц??鐚?筝?篌?茴???銀??膾睡???????KK??JMM 茹?絎?篋?絲劫?堺?シ?井?勛瓜???鐚?絋? `int`, `long`, `boolean` 膈?鐚????莅翠?勖????絖????鐚???や?? `long` ??? `double` ?????????絖???у?鎘?鐚?篏??ー篁? JVM ???絽娯??篆?莚???九??絖???э?????`volatile`, `synchronized`, `Atomic*` 膠紫????阪?九櫆札篆?莚???翫ぇ?????贋??篏???????絖???с??
+2. **?櫝????? (Visibility)**鐚?綵?筝?筝?鎖腮?篆勖?剛????延昆???????????種????銀??膾睡????遵??腴???括????域??筝ŭ信??鴻??絋????羃≧?????罩ユェ??緒??筝?筝?鎖腮?絲劫????????篆勖?劫櫝?遵Û?????篋???九轡篏????絖?筝昭和????銀??膾睡???櫝?順??筝???違??`volatile`, `synchronized`, `final` 膈???渇?????櫆札篆?莚??櫝????с??
+3. **???綺???? (Ordering)**鐚?篆?莚?篋?腮?綺??????т撮??????膽????蕁阪????ц?????JMM ???莅悟??莚???????紊?????????茵????篁ら?????綺鋌ユ??蕭???ц?緒??篏? `volatile`, `synchronized` 膈????罩ユ?阪?九櫆札胼?罩∝?劫???????灸???????????綺??篆?莚?腮?綺????紊?膾睡???ッ紜?筝??????ц??蕁阪?霳???蘂???????
+38. 莪?莪????茵????????????????
+ 膈?鐚????茵?????????????鐚?Happens-Before Rule鐚???? Java ???絖?罔≦??鐚?JMM鐚?筝上??箙????筝?膤糸??茹????鐚????篋???ゆ?上??膾睡?????篏?箙???雁?????絖??櫝????у??蕁阪????с??絋???????篏? A ???茵???????篋????篏? B鐚???d?? A ?????ц??膸????絲? B ?櫝??鐚?綛銀?? A ?????ц??蕁阪???????? B 箙?????????割戎膽?莚???????紊???????絲号??篁よ??茵?篋???????綺??箙?綽?蕁脂?球??菴?篋?茹???????筝肢????????茵?????????括鎧?????ロ??
+1. **腮?綺閩≦?頵????**鐚?筝?筝?鎖腮????鐚??????т撮???蕁阪??????????????∝?????篏????茵???????篋????????????∝?????篏????
+2. **???絎?茹????**鐚?筝?筝? `unlock` ???篏????茵???????篋??????√噲???筝?筝?????? `lock` ???篏????菴??????括??絋????膾睡?? A 茹i??篋????筝???鐚?膾睡?? B ???膸左キ???篋????筝?筝???鐚???d??膾睡?? A ???В????????????篏???遵噲膾睡?? B ?櫝?????
+3. **`volatile` ?????頵????**鐚?絲剛??筝? `volatile` ???????????????篏????茵???????篋??????√噲菴?筝?????????莚紙??篏????
+4. **篌???????**鐚?絋???? A ???茵???????篋? B鐚?筝? B ???茵???????篋? C鐚???d?? A ???茵???????篋? C???
+5. **膾睡????????????**鐚?`Thread` 絲壕院??? `start()` ??号?????茵???????篋?莚ョ鎖腮????罸鋇?筝???篏????
+6. **膾睡??筝中?左?????**鐚?絲合鎖腮? `interrupt()` ??号?????莪???????茵???????篋?茴?賢??下鎖腮???? `interrupted()` ??号????? `isInterrupted()` ??号?????菴????膸???????
+7. **膾睡??膸?膸?茹????**鐚?膾睡??筝中???????????篏???遵??茵???????篋?膾睡????? `finalize()` ??号?????綣?紮????
+8. **絲壕院膸?膸?茹????**鐚?筝?筝?噲莟∞??????????醇?井?ц??絎???????茵???????篋?絎???? `finalize()` ??号?????綣?紮????
+9. **篌???????**鐚?絋???? A ???茵???????篋? B鐚?筝? B ???茵???????篋? C鐚???d?? A ???茵???????篋? C???
+ ???菴?菴?篋?茹????鐚?JMM 筝榊??綺???????箴?篋?筝?腱????紊????紊?膾睡???ッ紜?筝?鐚????茹e??篆?莚????絖?筝???贋?х????号?????
+39. JVM ??????絖?羣√?阪??鐚???銀??膾睡???????櫜薩膸上轡篏?鐚?
+ 膈?鐚?菴??????割?? JVM ?????隙??絎??ー??????臀卡??篁ュ??????????????????膠糸????????絖?羣√?冴??
+* **`java.lang.OutOfMemoryError: Java heap space`鐚????羣√?削??**鐚?絋????篁?篁?????????絖????絨緒???????銀?????絖???阪??鐚?絋???????絖???????腥咲??/羂娯??篁c??膾睡????サ?医??絖?膈?鐚?菴????腥咲?器??綛銀??羃≧????銀??絲取?? JVM 膸?罩∝??筝ラ?????莚姒????d????や??絨?莚???????筝??????????絖????膾睡??鐚?絎?篌??????? OOM 綣?絽後攻?櫝?順??罩???箙?紊?鐚???銀??筝?箴?莎???????絖??????????膾睡?????莅坂??**?櫆札膸х鮫綏ヤ??**???篏???姒??絋??????????絖??????紊?膾睡????延昆??井?勛????榊??鐚????羣√?阪櫝?遵嚩??頑??篋?膾睡?????羈?罩e幻綏ヤ??????????????篏????
+* **`java.lang.OutOfMemoryError: PermGen space` ??? `java.lang.OutOfMemoryError: Metaspace`鐚????腥咲??/羂娯??篁f頃??削??**鐚?菴????絽後???????????莉巡??菴?紊????膠誌????????膠糸????井?勌拭????????Ã??頑??紊ф?吟??絋??????????菴?膠? OOM鐚???岩肩 JVM ?櫝?巡?????緇?筝?腮喝??鐚????筝榊瓜???莉遵????梧十??? JVM ??後???????順??筝????????????順?倶??篋?筝?羔????膠糸??莉順??膾睡???櫝?処????順?中??菴?茵?鐚?篏???岩??膤紫??緇??櫝?遵??綽?經ð????????羈?罩e幻???綺????
+* **`java.lang.OutOfMemoryError: Direct buffer memory`鐚???贋・???絖?羣√?削??**鐚?菴?羔??????? `ByteBuffer.allocateDirect()` ????????????絖?鐚?菴??????????絖?筝???怨??膊∞?????絋??????????菴?膠? OOM鐚??????隙??膸?罩√??莚?????????贋・???絖????膾睡??鐚?綛九櫝?遵襲?????岩肩 JVM ???腮喝????с??
+* **`java.lang.OutOfMemoryError: unable to create new native thread`鐚????羈????綮堺?亥鎖腮?鐚?**鐚?菴????絽娯???????筝阪?????絖?筝?莇鰹??????????筝堺??篏?膤紫??膾у????莎?羣??????駈??絋? ulimit 莅丞舟???膤紫?????絖?筝?莇喝嚩??贋??羈???????膾睡?????腥咲?雁??鐚??????????菴?膠脂??莚壩?駈??JVM ???羈????綮堺?亥鎖腮?鐚??ー???膾睡???櫝?巡??膸х鮫菴?茵?鐚?篏?膤紫????岩??紊??????遵??篌?紊уぇ筝???????
+ ??紫????ヨ?鐚???順?倶??篋??????灸????銀??膾睡???櫝?巡??篌?腴???括??罩???篏????絖?羣√?咲??絽御?壚??筝ŭ献?????????莚壚拭?埦??茵????膤紫??莎?羣????絨醇??絖???????絖?羈?羲靁???勰??鐚????膸?緇??櫝?遵嚩??贋?岩肩綺??????綺???? JVM 經ð?????
+40. 莚岩??筝?JVM 絽悟???????井????ŭ??鐚?
+ 膈?鐚?JVM ?????亥??膠紫??紊?鐚?篁ヤ????壚??篋?絽悟??筝????荀?????????亥瓜??????腓坂??鐚?
+* **??????絖???後??**鐚?
+ * `-Xms<size>`鐚?莅丞舟 JVM ???????句?????紮???????絖?紊у?????????絨???種?????綮肴佈莅丞舟筝? `-Xmx` ??後??鐚???水??????????ï??絽??ョ?? GC ?????????
+ * `-Xmx<size>`鐚?莅丞舟 JVM ?櫆戎????????紊у?????絖?紊у?????????紊у?種???????号??????????絖????羆?????????≦????糸??絖???????莅丞舟???
+ * `-Xmn<size>`鐚?莅丞舟??亥??篁eぇ絨???????絽梧倘臀勌減??岩肩?????? 1/3 ??? 1/2?????? G1 GC 筝TEL????贋・莅丞舟鐚???? G1 ??????∞?????
+ * `-XX:NewRatio=<n>`鐚?莅丞舟??亥??篁d?????綛岩撮???罸?箴????藥?莅ゅ?守??絽御?? 2鐚???活??綛岩撮??壩?亥??篁g??筝ゅ?????箴?絋? `-XX:NewRatio=2`???
+ * `-XX:SurvivorRatio=<n>`鐚?莅丞舟 Eden ??坂?????筝? Survivor ??榊??罸?箴????藥?莅ゅ?守??絽御?? 8鐚???? Eden ??阪ぇ絨???? Survivor ??榊?? 8 ??????箴?絋? `-XX:SurvivorRatio=8`???
+* **???腥咲??/羂娯??篁g?後??**鐚?JDK 8 ???筝肢????????腥咲?器??鐚?
+ * `-XX:MaxMetaspaceSize=<size>`鐚?莅丞舟???腥咲?贋??紊уぇ絨????藥?莅ゆ????灸??鐚????腥咲?翫ぇ絨鋌??????サ?医??絖??????吟??
+ * `-XX:MetaspaceSize=<size>`鐚?莅丞舟茹??? Metaspace GC ??????紮?紊у?????莨上?井4??惹?銀???????? Full GC ??ュ????句瓜?????井?勉??
+ * 鐚?JDK 7 ???箙????鐚?`-XX:MaxPermSize=<size>`鐚?莅丞舟羂娯??篁f??紊уぇ絨????
+ * 鐚?JDK 7 ???箙????鐚?`-XX:PermSize=<size>`鐚?莅丞舟羂娯??篁e??紮?紊у?????
+* **GC ??後??**鐚?
+ * `-XX:+UseSerialGC`鐚?篏睡?? Serial GC鐚?筝画???????九?Ǎ?????
+ * `-XX:+UseParallelGC` ??? `-XX:+UseParallelOldGC`鐚?篏睡?? Parallel GC鐚?綛区???????九?Ǎ?????
+ * `-XX:+UseConcMarkSweepGC`鐚?篏睡?? CMS GC鐚?綛九?????莅井????ゅ????九?Ǎ??鐚????絽檎??荀??????? `-XX:+UseParNewGC`鐚????篋???亥??篁e攻茵??????駈?????
+ * `-XX:+UseG1GC`鐚?篏睡?? G1 GC鐚?Garbage-First ?????九?Ǎ?????
+ * `-XX:MaxGCPauseMillis=<time>`鐚?G1 GC ?????勖?????紊у??蕁炊?狗?器??罸???鐚????G1 篌?絨?莚?筝?莇?菴?菴?筝??狗?眼??
+ * `-XX:ParallelGCThreads=<n>`鐚?莅丞舟綛区?? GC 膾睡????逸?????篋?綛頑住篁e????駈?????
+ * `-XX:ConcGCThreads=<n>`鐚?莅丞舟綛九?? GC 膾睡????逸?????篋????綛岩撮?????駈??絋? CMS???G1鐚????
+* **??????絖???後??**鐚?
+ * `-Xss<size>`鐚?莅丞舟罸鋇?鎖腮???????紊у?????藥?莅ゅ?守??絽梧恭紊?鐚?篏??????綵?羞怨墾紊ф??膾睡????医???????堺?壚???櫝?初??荀?莪???眼??
+* **莚???TEL??????ァ**鐚?
+ * `-XX:+PrintGCDetails`鐚??????域唵膸???? GC ??ュ??篆≧?壔??
+ * `-XX:+PrintGCDateStamps`鐚???? GC ??ュ??筝中????井?ユ????狗?贋?潟??
+ * `-Xloggc:<file>`鐚?絨? GC ??ュ??莨???阪?井??絎????篁吟??
+ * `-XX:+HeapDumpOnOutOfMemoryError`鐚?????????? OOM ??区????????????莉サ?????篁駈??heap dump鐚????
+ * `-XX:HeapDumpPath=<path>`鐚????絎????莉サ?????篁句????????莊??????
+ * `-XX:+PrintCommandLineFlags`鐚??????? JVM ???????銀戎???????巡擦茵????綽????
+ * `-XX:+UseCompressedOops`鐚???夌?????膽ð?勰??絲壕院??????鐚?藥?莅ゅ?夌?Ǎ??鐚??????? 64 篏? JVM 筝???????絖??????????
+* **??銀??**鐚?
+ * `-verbose:gc`鐚?莨???榊??荀???? GC 篆≧???井ァ??九伹??
+ * `-server` ??? `-client`鐚????絎? JVM 菴?茵?罔≦????ー篁? JVM 藥?莅や戎??? Server 罔≦??????
+ 菴?篋??Ŭ?奝?????絽悟???????逸??JVM ???箴?篋????絽娯鍵絲?????????亥??篋?莪?篌????莚???KK??
+41. VM 筝坂??箙?篏睡?????腥咲?贋?炊?≫??羂娯??篁o??
+ 膈?鐚?JVM鐚?筝肢????? Oracle ??? HotSpot JVM鐚?篁? JDK 8 綣?紮???????腥咲?器??Metaspace鐚???炊?∽宛箙?篁o??PermGen鐚?筝肢??????坂??篁ヤ?????筝??????鐚?
+1. **羂娯??篁eぇ絨???阪??筝?絎号??羣√??**鐚?羂娯??篁g??紊у?????菴? `-XX:MaxPermSize` ?????域倘臀卡??藥?莅ら??絽御??莨?絨??絋? 64MB ??? 82MB鐚?????????? Java 綺????????ヨ??紊????鐚????莉順??膠祉??絽檎???????号????坂拭??夌???????井?勰????ュ?у?????鐚?緇?絎号??絨沿??絨醇宛箙?篁gÃ??器??絲取?? `java.lang.OutOfMemoryError: PermGen space` ???莚壔??菴?筝??勰?????罅???駈??絋? Spring???Hibernate鐚?綛炊??篏睡?????OSGi 膈???????罔≦???????堺?壚??絨や減腦???冴??
+2. **?????井??ぇ絨鋇??????上????句????ヤ????拷??**鐚?羂娯??篁f???????筝???????鐚?篏睡??筝????綛岩撮??後????????篁e????上????句????ャ??篏???姒??膠糸??莉遵????セ昆????????遵??????櫝?巡?????莉順??膠私?????鐚?菴?絲取?贋宛箙?篁d賢絖????紊ч????鞘札?????句???????常??絋???梧十???膠糸??莉遵???????九??莉順??膠誌????????腥咲?翫????贋・篏睡????サ?医??絖?鐚?Native Memory鐚?鐚?筝???????絖????胼誌????九????上????句????ヤ??膠糸??莉遵?????????遵???????翫?拷??鐚??櫆札??贋???????医????銀?????篏睡????膠糸????井?勉??
+3. **???腥咲?翫ぇ絨???雁?究柑**鐚????腥咲?顔??莅や??莅丞舟???紊т?????鐚???????篋???サ?医??絖???脂???鐚??Ŭ????? `-XX:MaxMetaspaceSize` 茴???上?顒丞舟??倶?????筝?筝ŭ????????菴???水??篋?羂娯??篁i?g????阪??筝????絽??ョ?????腦???金??羣√?咲?勰??鐚?篏水?????腥咲?翫櫆札??????綺??????荀?????????ï??鐚???翫?域松??遺??????????サ?医??絖????絨純??
+4. **??鎞? Full GC 蘂????**鐚???延?????腥咲?岩?????筝?絽梧???????????絖? GC鐚???ら?? `-XX:MaxMetaspaceSize` 茴?倘臀勌??腥咲?岩??莇鰹??鐚?絨??????井?勛??膊∞??篁????筝上??胼糸?堺?ワ???櫆札??鎞????羂娯??篁e????区??茹?????? Full GC鐚?篁???????篏? GC ???蕁水噲綺??????ц?順??綵怨?????
+ ??紫????ヨ?鐚????腥咲?雁??莅乗?≧?????В??恰宛箙?篁gÃ??岩??莇潟???????倶?????篏????絎号??羣√?榊????勰??鐚????箴???雁?究柑?????翫?ュ??????号????阪??絖?膊∞????号?????
+42. Java??????膸??????壚??箙???桁?????鐚?篁?箙??????筝下??羂娯??篁?(Perm Gen space)?
+ 膈?鐚?
+* **Java ??????膸????**鐚?Java ?????? JVM 膊∞????????絖???阪??筝中??紊х??筝????鐚?茴???????膾睡????延昆鐚?筝肢?????篋?絖???上噲莟≦??箴??????亥???????????篁e????上????句????ヤ??鐚???????絽梧←??????筝坂犬筝ŭ源荀???阪??鐚?
+ * **??亥??篁? (Young Generation)**鐚???医??綮榊??絲壕院薤???????????????????????亥??篁e??膸????筝削??
+ * **Eden ???**鐚?紊у????井?医噲莟♂??????????????????????
+ * **筝や肩 Survivor ??? (From ??? To)**鐚????篋?絖???丞?颷?筝?罨≧??紊?罨? Minor GC ???篁???九??羇紫??絲壕院???罸閩? Minor GC ???鐚?Eden ??? From ??坂賢絖?羇紫??絲壕院篌?茴?紊???九?? To ??削????九?? Eden ??? From ??肴←羝?腥冴??筝?筝?罨? Minor GC ??駈??From ??? To 茹???俄????≪?????絽後Ŭ??筝?筝? Survivor ??堺?壩柑????????
+ * **???綛岩撮 (Old Generation / Tenured Generation)**鐚??????亥??篁d賢膸????篋?紊?罨? Minor GC 篁???九??羇紫??絲壕院鐚??????????菴? `System.gc()` 綣阪?区??????????????紊у噲莟∞?贋・??????鐚??????割?????臀卡??鐚?篌?茴?習腱糸?域??綛岩撮??????綛岩撮筝肢??絖???丞????遵?????莨???睡??絲壕院???
+ * **(JDK 8 箙????) 羂娯??篁? (PermGen Space)**鐚???順?銀献??惹?ヨ?羂娯??篁d??絮?篋???????筝???????鐚?絎???壩?号????阪?? HotSpot JVM 筝????絎??ー鐚?鐚?篏???? JDK 8 箙????鐚?絎?絽後幻茴???颷遺減??????筝??????????筝????膣у????後?潟??絎????篋?絖????瓜????????井?勌拭??姒??絋?膠糸??箙????絽檎?閺??????号??篆≧?夌??鐚?????????????????????恰?句??莚??????莚???????篁g??膈????羂娯??篁g??紊у????ス??篋????鐚???? `-XX:MaxPermSize` ?ァ??吟??
+ * **(JDK 8 ???箙????) ???腥咲?? (Metaspace)**鐚????篁d??羂娯??篁o?????篋?絖????瓜????????井?勌拭??壔?????腥咲?岩戎?????サ?医??絖?鐚?紊у?騌?莅ゅÛ??膤紫???櫜?????絖??????駈??????菴? `-XX:MaxMetaspaceSize` 莅丞舟筝???????
+* **篁?箙??????筝下??羂娯??篁?(Perm Gen space)**鐚?菴???壚??筝?幻茹????莚虁В???**羂娯??篁o??PermGen鐚?綛銀??????????筝???????**???絎???? HotSpot JVM 絲? Java 茹????筝No????号????財??鐚?Method Area鐚????筝?腱?絎??ー?????号????堺?? JVM 茹????茹?絎????筝?筝??肢??网?綽球?阪??鐚????篋?絖????綏画←????????阪??莉順??膠私拭??壔??絽檎??????????????????????恰?句??莚??????莚???????篁g??膽?絖?膈??????? HotSpot JVM ?????ð????? JDK 8 箙????鐚?菴?筝??阪??茴???隙??絎??ー筝財??羂娯??篁b??鐚?綛銀????句Ã??贋?壩????????鐚???? `-XX:MaxPermSize` ?????駈??鐚?筝?筝? Java ??????綣?膊∞??鐚?篏?筝よ????順?? JVM 膊∞???????延??羂娯??篁gÃ??翫?阪??筝?絎号??羣√?削??JDK 8 綣?紮???????腥咲?器??Metaspace鐚???推撮篋?絎?鐚????腥咲?雁?贋・篏睡????サ?医??絖?鐚?紊у????雁?究柑???
+43. JVM???羂娯??篁d賢篌????????????上????銀??鐚?
+ 膈?鐚???夌??鐚?JVM ???羂娯??篁o??PermGen鐚?筝TEL?????????????上????駈??篏?絎?????????倶?阪?銀????????絖?鐚???亥??篁c?????綛岩撮鐚?筝???????
+* **篏???九?????**鐚?綵?羂娯??篁gÃ??岩??莇鰹?????羈?筝堺?亥??膠糸??莉純??絽檎?靁??????????絖???駈??JVM 篌?茹??? Full GC鐚????絮??????上????駈??鐚???銀賢???筝???????綏ヤ??絨掩????莚??????倶宛箙?篁d賢筝????篏睡???????絖????
+* **?????銀??箙?**鐚?羂娯??篁d賢????????鞘源荀????**??梧十???膠糸??莉遵???????九??莉順??膠?**???綵?膠糸??莉遵??←?????上????九????ゅ??筝坂?????茴?綣???Ǎ???櫆札茴??????駈????駈????九??莉順????????膠私???櫆札茴???梧十鐚?篁?????????丈宛箙?篁d賢????????腥咲?器???????ス瓜?????井?勉?????????????靁?鐚????篏???姒??菴?筝???腮?罸?莨?紊????鐚????筝? JVM ???荀?隋勌????梧十膠私??篌???翫????銀??篁???倶柑莊????篁g?????
+* **?????倶?????**鐚???延??羂娯??篁g???????倶???????亥瓜??梧十鐚?菴???壚??筝??後噲莨??????????篏?鐚?綛銀????九????倶????????絽娯??絋???亥??篁e?????綛岩撮????????吟??菴?箙???壚減篁?箙?羂娯??篁e俉??????筝阪??莉処??紊?膠肢??絲取?? OOM鐚????筝阪?割戎???緇?紊?膠糸??莉遵??←?????駈??篏?絎?篁サ??莉順??膠糸櫝?遵??筝阪???????括鎧紊?????????鞘札茴???梧十???
+ ??紫????ヨ?鐚?羂娯??篁d?????????????上????駈?????絽御?? Full GC ???筝???????鐚?鐚?筝肢????勖??????梧十筝???????荀????膠糸????句?後?括???????井?卡??篏??????倶??????????倶?坂??絋???????絖???究柑???
+44. 篁?箙????????????鐚???????絖?????????????紊уソ紊???壚??箙?鐚?篁?箙????Java????????削??
+ 膈?鐚?
+* **篁?箙????????????**鐚?絖???????鐚?Bytecode鐚???? Java 羣?篁g??膸颷?膽?莚???Ǎ??`javac`鐚?膽?莚?????????????筝?腱?筝???隙??隋コ散??????篏?膤紫???????括??筝右?岩撮??????絎???壚??膤糸?????篁ょ????????鐚?菴?篋????篁ょ??莅乗?≧?壚減篋???遵?? Java ????????削??JVM鐚?筝?茹i????ц?????膽?莚???ц?????絖??????????篁狗??絽娯札 `.class` 筝堺?ï????????絎?筝???壩?阪????鐚?筝???順?贋・??????篏?膤紫??筝?菴?茵????
+* **??????絖?????????????紊уソ紊?**鐚?
+ 1. **綛喝佀????恰?э??Write Once, Run Anywhere - WORA鐚?**鐚?菴???壩??紊х??絅遵???????延??絖???????筝?箴?莎???劫?????隋コ散??倶????????篏?膤紫??鐚??Ű????勖????阪??筝?絎?茖?篋?絲劫???????ス?? JVM鐚?絨怨櫆札茹i???????ц??菴?罧球???????????菴????紊у?亥?????篋? Java 腮?綺???????讐???膸贋?ゃ??
+ 2. **???蕭???ц????????**鐚???順?区В?????ц??絖???????罸???贋・??ц????サ?井?阪?????????篏??ー篁? JVM ???絽後???????恰?句??莚???Ǎ??JIT - Just-In-Time Compiler鐚?鐚?絎??櫆札?????茵???九????下?剛撮???鐚?蘂?膵???ц?????篁g??鐚?膽?莚??????サ?井?阪????鐚?篁?????キ緇??・菴???????篁g???????ц?????綺???
+ 3. **絎???????**鐚?絖?????????セ昆?櫆札菴?茵?薨?莚?鐚?JVM ??????莉遵????ц??絖??????????篌?菴?茵?筝?膤糸??絎????罍???ワ????我2??倶?鋌g????翫?靗紫?????
+ 4. **篌?????櫝?醇??**鐚?JVM ?櫆札?????茵???九噲絖???????菴?茵????腱?篌????鐚?絋???????????????後????????緇?ッ絮?綣?膈?鐚?菴?篋?篌????絲剛??膽?莚??????ヨ??櫝?初?鞘札?????莚????絎???????
+* **篁?箙????Java?????????**鐚?Java ????????削??Java Virtual Machine鐚?膊?腱? JVM鐚???壚??筝?????????莅∞????削??絎???壚??腱???処院?????阪??罔≦?????絎?綛銀?????絎?絖???Ǎ???????虁??茵?????ñ??莅∞????坂?????筝?筝???腮????JVM ???筝肢??篁糸?≧?姒??
+ 1. **???莉?**鐚?篁????篁句鎧膸????臀?膸????莉? `.class` 絖??????????篁吟??
+ 2. **薨?莚?**鐚?隋勌?????莉順??絖???????膃??? JVM 茹????鐚?筝?篌???翫????九????????
+ 3. **???紊?**鐚?筝榊瓜???????????????絖?綛区倘臀勰??莅ゅ??紮???若??
+ 4. **茹f??**鐚?絨?膃?垸????Ǎ??絋???号????????絖?罧球??鐚?茹f??筝榊?贋・綣???Ǎ?????絖???医??鐚????
+ 5. **茹i??/膽?莚???ц??**鐚?絨?絖???????膺肢???????劫?????篏?膤紫?????隋コ散綛喝佈?遵?????茹g????サ?井?阪?????篁ゅ攻??ц?????菴????絽檎??菴?茹i?????絎????鐚???下?剛撮???篌???? JIT 膽?莚??????莚??????サ?遺撮???篁ユ??蕭???ц?純??
+ 6. **???絖?膊∞??**鐚?膊∞?? JVM ???????????絖???阪??鐚???????????????号?????/???腥咲?雁??鐚?鐚??????サ??絖???????????????上????吟??
+ 7. **???箴?菴?茵???句ッ紜?**鐚?筝? Java 腮?綺????箴???ц????????????ッ紜?鐚??????ス瓜綺????絎?????∞??????????
+ 膊??????ヨ?鐚?JVM ??? Java 腮?綺颷?茵??????榊??鐚?絎?絎??ー篋? Java ???莊?綛喝佂?号?э??綛区??茣g?∞?????絖??????ц??篁g??膈???後???????純??
+45. MinorGC ???菴?腮?
+ 膈?鐚?Minor GC鐚?箙?腱遺減 Young GC鐚???奝??絲? Java ???筝中?亥??篁e?阪??????????上????区??腮??????句?勖?????????? Eden ??阪?? From Survivor ??坂賢筝????茴?綣??????絲壕院鐚?綛九??絖?羇紫??絲壕院腱糸????? To Survivor ??堺?????綛岩撮???筝肢??菴?腮?絋?筝?鐚?
+1. **???莅? (Mark)**鐚?GC 膾睡??篌?篁? Eden ??阪?? From Survivor ??阪??羇紫??絲壕院綣?紮?鐚???????絎?篁ス??綣?????常?????莅井??????櫝松鐚?篁???区←綣???Ǎ?????絲壕院????????????←???莅亥??絲壕院茴?丨筝堺??????障??
+2. **紊???? (Copy)**鐚?GC 膾睡??絨? Eden ??阪?? From Survivor ??坂賢??????茴????莅遺減絖?羇紫??絲壕院紊???九?? To Survivor ??冴?????紊???区??腮?筝昭和??絲壕院???綛顔??鐚?Age鐚?茵?ず絲壕院膸????菴?紊?絨?罨? Minor GC 篁???九??羇誌??篌?紜???? 1???
+3. **羝????/羝?腥? (Sweep/Clear)**鐚?Eden ??阪?? From Survivor ??肴←羝?腥削?????筝阪??篁コ賢?????????絖?羇糸噲莟♂?遵群膸頮?紊???九?? To Survivor ??削?????←紊???句??絲壕院鐚??????常???櫆札茴??????吟??
+4. **??贋?井?????**鐚???贋?井?????菴?篋?絖?羇糸噲莟∞??綣???Ǎ??篏水?倶????? To Survivor ??榊????遺??臀卡??絋????絲壕院茴?Щ???篋?鐚????
+5. **茹???俄?????**鐚?Eden ??坂?????筝????鐚?From Survivor ??阪?? To Survivor ??榊??茹???俄????≪??筝?筝?罨? Minor GC ??駈??綵???? To Survivor ??坂???????? From Survivor ??削?????箙?篋??吟??
+6. **綛顔???????? (Promotion)**鐚????紊???区??腮?筝昭和??絋????絲壕院???綛顔??莨上?遺??絎??????種????? `-XX:MaxTenuringThreshold` ?????井ァ??駈??藥?莅? 15鐚?鐚???????絲壕院???紊у?顥?菴?篋? survivor ??榊??絎拷?????????菴?茵?篋?筝?罨? Minor GC ???鐚?絲壕院篁???九??羇私?? survivor ??堺?鞘??筝?鐚?菴?篋?絲壕院篌?茴??贋・紊???九?域??綛岩撮???
+ Minor GC ???絽御??莨?綽???鐚????筝阪???Û???????亥??篁e?阪??鐚?絲壕院絖?羇紫????後噲莨?篏????篏?罸閩? Minor GC ??巡??綣?莎隙??罨∞?中????? Stop The World鐚?STW鐚?鐚???????綺??????綺靮睡?????
+46. CPU ????????蕭?絋?篏???????
+ 膈?鐚??????? Java 綺???? CPU ????????蕭??????勰?????絽檎??荀?膸????紊?腱?綏ュ?桁????号??鐚?罩ラĽ紊ц?翫??筝?鐚?
+1. **隋勤丨??勰??**鐚?篏睡?????篏?膤紫??綏ュ?件??絋? `top`, `htop`, `vmstat`, `ps aux &#124; grep java`鐚?隋勤丨????ŭ肩 Java 菴?腮? CPU ????????蕭?鐚?篁ュ??????ŭ肩 CPU ??後?????????????後????初?????
+2. **?キ???膾睡??綽???**鐚?篏睡?? `jstack <pid>` ??巡擦?キ??? JVM ???膾睡????????篆≧?壔??紊?罨∴キ???鐚?絋???顔?????腱??キ??????罨\???櫆札茹?絲?膾睡????倶??????????????
+3. **??????膾睡????????**鐚?
+ * ??? `jstack` 莨???坂賢鐚???ユ?? `java.lang.Thread.State: RUNNABLE` ???膾睡??鐚???劫????奝?d???????? CPU ???蕭????膾睡??鐚??櫆札???菴? `top -H -p <pid>` ??ョ??罸鋇?鎖腮???? CPU ?????Ǎ????九????上?医噲綺????膾睡?? ID鐚??????? `jstack` 莨???坂賢??ユ?乗唫膾睡?? ID 絲劫???????????鐚????
+ * ??????菴?篋?膾睡??罩e????ц??篁?箙?篁g???????????篆≧?壚????丞ず膾睡??綵????罩e????ц?????膠祉????号?????茵??垩??
+ * 絽梧?????蕭? CPU 羔???????????????ロ??罩糸妾?ッ???蘂?膵????絖?膃?顕??惹・鐚?篏睡?? `+` ?埈????? `StringBuilder`鐚????篏???????膊?羈????菴?紊???????腴?篋????蘂?膵???? GC鐚?絨ゅ?倶?? Full GC鐚????紊ч?? I/O ???篏?鐚?絋?臀?膸?莚傑????????篁区嚞???鐚?膈????
+4. **篏睡?? Profiler 綏ュ??**鐚?篏睡??筝?筝???? Java Profiler 綏ュ?件??絋? VisualVM, JProfiler, YourKit, Async Profiler 膈?鐚?菴?茵???贋訓??ョ???????????
+ * **CPU Profiling**鐚?Profiler ?櫆札膸?莅≧?号??莪???????????駈????上?堺????? CPU ??狗?贋??紊??????下?号?号??鐚?Hotspot Methods鐚????菴???順?贋・絎?篏???遺撮???絮???∝????ц?順?狗?????
+ * **????医?? (Flame Graph)**鐚?莅後???ー篁? Profiler ??壩?? Flame Graph鐚???頑????医??腓肴??????????????絮?膾х?? CPU 羔????罸?箴?鐚????絽檎?????綽???絎?篏???下?鴻??
+ * **?????????**鐚?罍???ユ?????????鎖腮????膈?緇?????????糸??鐚?絲取?雁鎖腮??????√?????紜?紊э????贋・絲取?? CPU ???????????
+5. **膸????筝???♂?肢??**鐚?????????上?亥????下?剛撮??????罩糸妾?ッ鐚?膸????筝???♂?肢????ゆ?中?????奝?????茵?筝削??罸?絋?蕭?絣井??紊????紊ч?顓傑??鐚?鐚?菴???壚撮???膽咲?傑??莅乗?♂?勰?????
+6. **篌????**鐚???号???????膸????菴?茵?篁g??篌????鐚?絋???壕??膊?羈??????鎞????腴?篋????篌???? I/O ???篏??????水??筝?綽?荀????莅∞??膈????
+ ??岩肩菴?腮????荀????綽????膸???器???櫝?初??荀?紊?罨≧????????????????井?勖????醇?上?井?号?サ????????
+47. Serial筝?Parallel GC箙???雁??筝????箙?紊?鐚?
+ 膈?鐚?Serial GC ??? Parallel GC ??? HotSpot JVM 筝TEL犬腱?筝????????????上????九?Ǎ??筝肢????阪?????篋?鐚?
+1. **綏ヤ??膾睡????育??**鐚?
+ * **Serial GC**鐚?篏睡?????筝? GC 膾睡??菴?茵??????上????吟?????莅堺?壩?亥??篁e????駈??Minor GC鐚?菴???虁??綛岩撮?????駈??Full GC鐚?鐚???遵Ü??莎?筝?筝?鎖腮????
+ * **Parallel GC**鐚?箙?腱遺減 Throughput Collector鐚?鐚?篏睡??紊?筝? GC 膾睡??綛区??菴?茵??????上????駈????劫?????????亥??篁e????駈??Minor GC鐚???倶侊??????綛岩撮?????駈??Full GC鐚???倶侊鐚?Parallel GC ???絽娯????????筝? Serial Old鐚?筝画?????綛岩撮?????九?Ǎ??鐚???割戎??????筝?鎖腮????
+2. **????????堺??**鐚?
+ * **Serial GC**鐚???????篋??????? CPU ??? CPU ??後????域??絨???????絖?莨?絨??????堺?壔?????筝阪??筝?羔????紊?膾睡?????罩ュ?????鐚??????羣???????????ッ紜?筝??櫝?処;?ー??翫ソ?????? Client 罔≦?? JVM ???藥?莅ゅ????九?????
+ * **Parallel GC**鐚???????篋?紊???? CPU???菴醇??蕭???????????????堺?壔?????菴?綛区???????九櫆札??乗??膽ñ?? Minor GC ??????蕁炊?狗?器?????蕭?綺??????綺??????岩?????????????????隙撮?????ц????狗?? / (?????隙撮?????ц????狗?? + GC ??狗??)鐚??????? Server 罔≦?? JVM ???藥?莅ゅ????九?Ǎ?????????亥????コ賢?櫝?初??莅ゆ?? G1鐚????
+3. **???蕁炊?狗?? (Pause Time)**鐚?
+ * **Serial GC**鐚???延???Ü戎???筝?筝?鎖腮?鐚? Minor GC ??? Full GC ??????蕁炊?狗?顔??絽梧????随?????筝堺??????????欠鎖腮???初??荀???????鐚?STW鐚???ョ??緇? GC 絎???????
+ * **Parallel GC**鐚?Minor GC ??延??篏睡??篋?紊?筝?鎖腮?綛区??紊????鐚????蕁炊?狗?顔??絽御?? Serial GC ??昭和?????紊???御?阪??筝?鐚????篏? Full GC鐚?絋????篏睡?? Serial Old鐚?篁???銀?????莨???睡?????蕁帥??
+4. **????????? (Throughput)**鐚?
+ * **Serial GC**鐚????????????後噲莨?篏?鐚????筝? GC 膾睡????????篋? CPU 莎?羣?鐚?筝????膾睡???????狗??綺?????≪??
+ * **Parallel GC**鐚?莅乗?∞?勖????壩??蕭??????????????菴?綛区???????九?鎞? GC ??狗?器??莅ð?翫?? CPU ??狗?雁??篋?綺??????綺???ц?????
+5. **???絖???????**鐚?
+ * **Serial GC**鐚????絖?????????篏?鐚????筝阪??筝????荀?筝阪??筝? GC 膾睡????????蘂?紊???????絖?腥咲?眼??
+ * **Parallel GC**鐚??櫝?初??荀???翫????????絖????篋?紊?膾睡??綛区??紊????鐚?箴?絋????荀?蘂?紊??????井?勛???????ユ?壩??綛区?????莅違??紊???句?????篏????
+ ??紫??鐚?Parallel GC ??? Serial GC ???紊?膾睡???????ロ??筝肢??篌???水??篋?紊???悟ッ紜?筝??????ц?醇?????鐚???劫????夌而??? Minor GC ???蕁炊?狗?翫?????蕭??????????????????ï?ŭ肩?????割??綺????絲劫??蕁炊?狗?翫????????????????隙??荀?羆?篁ュ??隋コ散?ッ紜????
+48. WeakHashMap ??壩??箙?綏ヤ?????鐚?
+ 膈?鐚?`WeakHashMap` ??? Java ??????罅???銀賢???筝?腱???号????? `Map` 絎??ー鐚?絎?筝???勰????? `HashMap` 筝????箙?紊????篋?鐚?絎?絲拷?卡??Key鐚?篏睡??綣怨????Ǎ??`WeakReference`鐚??????九轡篏???????絋?筝?鐚?
+1. **??勛??綣怨?????**鐚?`WeakHashMap` 筝下??罸鋇??勰?醇?壚??筝? `WeakReference` 絲壕院???菴??????括??綵???や?? `WeakHashMap` 箙?紊?羃≧????銀??綣阪???????????莚ラ??噲莟≧?駈??菴?筝???噲莟≦葦???筝阪????上????句????????絲壕院?????割戎 `WeakHashMap` 筝左????????莚ラ?勛??綣???Ǎ??GC 篁???九櫆札?????九?????
+2. **??主??綣阪?????**鐚?`WeakHashMap` 絲劫?種??Value鐚?篁???銀戎???綣阪????Ǎ????勰?????絲壕院綣???Ǎ??????Ű?? `WeakHashMap` 筝中?????絲劫?主??綣???Ǎ????????紊?????????銀??綣阪???????????莚ュ?種??莚ュ?弱葦筝?篌?茴? GC ?????吟??
+3. **綣????????? (Reference Queue)**鐚?`WeakHashMap` ??????惨??や??筝?筝? `ReferenceQueue`???綵? GC ?????銀??筝?筝? `WeakReference` ???噲莟≧?駈??菴?筝? `WeakReference` 絲壕院??セ昆鐚?羈?????筝??????綣?????????噲莟\??篌?茴??????ュ?域??筝??????筝KK??
+4. **羝??????阪??**鐚?`WeakHashMap` 篌?絎????鐚??????????篋????篏?絋? `get`, `put` ??駈??罍???ヨ??筝? `ReferenceQueue`???絋????????ー??? `WeakReference` 絲壕院菴???ラ?????鐚?莚贋??絲劫????????群膸頮? GC ?????銀??鐚?`WeakHashMap` 篌?篁????昆???絨?筝下Щ??よ??篋?????弱噲鐚?篁?????????上噲??弱噲莟∞??綣???Ǎ??莅ï?弱噲莟&gt;????処← GC ?????吟??
+ **筝肢???????**鐚?`WeakHashMap` ??????篋????荀?膽?絖???井?卡??篏????筝?絽????膽?絖?絲壕院??紙2??区← GC ?????句????堺?壔??箴?絋?鐚?膽?絖?筝?篋?筝贋?区?∞??膸????鐚?綵?膤紫?????絖?膣у????駈??菴?篋?膽?絖??櫆札茴?????羝???わ????水?????絖?羣√?冴??絎?絽悟??篋?膽?絖?筝?膠糸??莉遵???後?括??莎?羣?鐚?綵?膠糸??莉遵??← GC ??駈????九??莉順??膠紫?後?括??膽?絖???井?勌????初?鋈?茴?羝???ゃ??
+49. 茹i?? Java ???腥咲?翫?? GC鐚?
+ 膈?鐚?
+* **Java ???腥咲??**鐚?Java ?????? JVM ???膊∞?????絖?筝中??紊х??筝????鐚???壩?????膾睡????延昆??????絖???阪?????絎????筝肢??篏???????????????箙??????????絲壕院絎?箴??????亥??????????? JVM ???????九??綮削?????篋??????????絖??????????筝坂?????蕭??????上????倶?????鐚???????絽梧←??????筝坂??????????阪??鐚????絽梧??????????篁f─???鐚?絨??????????筝堺?亥??篁o??Young Generation鐚???????綛岩撮鐚?Old Generation鐚??????亥??篁e??膸????筝? Eden ??阪??筝や肩 Survivor ??削?????篋?絖???丈?医??綮榊??絲壕院??????綛岩撮???篋?絖???丞????遵?????莨???睡??絲壕院鐚????絽御?夌?颷?紊?罨? Minor GC 篁???九??羇紫??絲壕院篌?茴?Щ?????域????????
+* **?????上????? (GC)**鐚??????上????倶?? JVM ??????∞?????絖????筝?腱???阪?駈????句?勛????虁????罍?羌?綛九????狗?d??筝????茴?算篏?綣?????????????絲壕院??????????????絖?鐚?篁??????水??腮?綺???????????∞?????絖?絽??ョ??紊??????у?????莚姒??絋????絖?羈?羲???????絖?羣√?削?????GC 筝肢?????菴?篁ヤ??罩ラĽ絎??ー鐚?
+ 1. **???莅? (Mark)**鐚?GC 膾睡??篁?筝?膸???劫噲莟\??絋????絮?????????????筝下??絮??????????????????違??JNI 綣??????鐚?綣?紮?鐚??????????????櫝松???絲壕院鐚????莅医??篁コ減???絖?羇獅?????
+ 2. **羝????/紊????/??雁?? (Sweep/Copy/Compact)**鐚???号?勌???????? GC 膊?羈?鐚???????筝???????膈???ュ????????←???莅亥??絲壕院鐚???喝????常??鐚?
+ * **???莅?-羝???? (Mark-Sweep)**鐚????莅井?????絖?羇糸噲莟\????九??羝???ゆ????????←???莅亥??絲壕院鐚?絨???九??????????絖????莅遺減?櫔?????鐚????篌?篋х?????絖?腆???????
+ * **???莅?-紊???? (Mark-Copy)**鐚?絨?絖?羇糸噲莟≦????九?遺???????亥?????絖???阪??鐚????絽御?壩?亥??篁g???Ί??筝? Survivor ??堺??筝????筝?????????絖?鐚?鐚???九??羝?腥阪????ョ?????絖???阪???????????篋?絖?羇紫??篏??????阪??鐚?絋???亥??篁o??鐚?筝?篌?篋х??腆????鐚?篏?篌?羌?換筝???????腥咲?眼??
+ * **???莅?-??雁?? (Mark-Compact)**鐚????莅医??羇糸噲莟\????九??絨???????絖?羇糸噲莟∞Щ?????医??絖????筝?腴姒??羝???ゅΊ??腴夌?????絖??????????篋?絖?羇紫??蕭??????阪??鐚?絋????綛岩撮鐚?鐚?筝?篌?篋х??腆????鐚?篏?腱糸??絲壕院?????セ??蕭????
+ 3. **??????**鐚??????乗←隋???筝阪????丞??絲壕院??????????????絖?腥咲?器??篏水?九櫆札茴?????医?????膸???亥??絲壕院???
+ 筝??????? GC 膊?羈?鐚?絋? Serial GC, Parallel GC, CMS GC, G1 GC, ZGC鐚???????莅医??羝????/紊????/??雁????倶侊篏睡??筝???????膈???ワ??篁ュ抗茵≦??絖??????句??????????????蕁炊?狗?翫?????絖?腆????膈???勰?????
+50. 篏???巡??莚? GC ??ц?????鐚?
+ 膈?鐚?筝???純??Java ????????榊??莅乗?≦?????箙?筝???虁?????∞?????絖?鐚?腮?綺???????羈?膕丞`?ァ??倶??篆?莚??????上????駈??GC鐚?篏???九????????GC ???茹?????倶?榊?? JVM ????????上????九????号???九???????羈????綵???????絖?篏睡???????笈??????喝???????順?倶??箴?篋? `System.gc()` ??? `Runtime.gc()` ??号??鐚?篏?莪????絎?篁?**綛銀??篆?莚?**篌?腴???活Е??? GC鐚?箙?筝???巡??莚? GC 筝?絎?篌???ц?????
+ 莪???? `System.gc()` ??? `Runtime.gc()` ?Ŭ???? JVM ?????坂??筝?**綮肴佈**鐚?莚傑?? JVM 絨遵辱??ц?? GC???JVM ?櫆札?????ï申??ヨ??筝?噯羆?鐚?????????号?????????倶????喝???????札???篏???倶?ц?? GC???菴?腱?莅乗?≧?壚減篋???水??腮?綺???????菴?蘂?膵?莪???? GC ??モ??篌??????????絖?篏睡?Ǎ?????筝阪失??? GC ?櫝?巡??絽??ラ??紊??????ц?遵?????鐚?綛銀???櫝?順?翫?? JVM ???昆???篌????膈???ワ??絋? JIT 膽?莚???????絖???????膈???ョ??鐚????
+ ???罩わ??罩g`??????羈???壚拭篁? JVM ???????????絖?膊∞????阪?駈??筝?羈?篋?膽???????絖?篏睡??????????篁g??鐚?綛九??綽?荀???狗??菴?????ァ?????????綏ュ?傑?ヤ??茹? GC ???茵?筝阪?????絖?篏睡???????居?????筝???虁????上サ???篆?莚??????????綣阪?金??GC ?????ц?????
+51. JVM筝上?ŭ肩?????井?夌????ユァ??句鎖腮?????????????絨?????
+ 膈?鐚???? JVM 筝昭和???????ユァ??倶?鋇?鎖腮????紊у??????????井?? `-Xss`鐚???? `-XX:ThreadStackSize`鐚????
+* **??弱??**鐚?`-Xss<size>`
+* **莚贋??**鐚?菴?筝?????井??絎?篋?罸鋇?鎖腮????綮堺?九???????????腥咲?翫ぇ絨????箴?絋?鐚?`-Xss1m` 茵?ず罸鋇?鎖腮??????? 1MB ??????腥咲?眼??
+* **綵怨??**鐚?
+ * ???腥咲?岩源荀????篋?絖????絮????????????????篏???井???????号??莪????篆≧?夌?????罸鋇??号??莪?????巡????????筝????綮坂??筝???絽э??絋???????腥咲?岩??莇鰹??絨延???????? `java.lang.StackOverflowError`鐚????絽悟?演??綵?菴?羞掩?????絽ц??紊у??莎件????? `java.lang.OutOfMemoryError: unable to create new native thread`鐚?綵?膤紫?????羈?筝堺?亥鎖腮???????莇喝????????腥咲?贋?駈?????絽後??筝? `-Xss` 莅丞舟菴?紊ф??膤紫??莎?羣????絨緒?????
+ * ??????絖?莎?羣???????????ッ紜?筝?鐚???鎞? `-Xss` ?櫆札???莅後??綮堺?翫?????膾睡??鐚?篏??櫝?巡??紜???????羣√?榊??蕋???í?????箙?鐚?紜?紊? `-Xss` ?櫆札??鎞????羣√?榊??蕋???ú??篏?篌???鎞??櫔??綮榊??膾睡????育?????
+ ???絽醐??JVM 篌?筝坂????????篏?膤紫?????罔≦???Server/Client鐚?莅丞舟筝?筝???莅ょ?????紊у???????? 64 篏?膤紫??筝?鐚?藥?莅ゆ??紊у???櫝?処??紊э??絋? 1MB鐚?鐚??????? 32 篏?膤紫??筝??櫝?処??絨??絋? 256KB ??? 512KB鐚??????号????????????羆????隋コ散莎?羣?鐚??櫝?初??荀?莪???頑??筝?????違??
diff --git "a/Java351円235円242円350円257円225円351円242円230円351円233円206円347円273円223円345円217円267円/README.MD" "b/Java351円235円242円350円257円225円351円242円230円351円233円206円347円273円223円345円217円267円/README.MD"
index 7397d39..84f495a 100644
--- "a/Java351円235円242円350円257円225円351円242円230円351円233円206円347円273円223円345円217円267円/README.MD"
+++ "b/Java351円235円242円350円257円225円351円242円230円351円233円206円347円273円223円345円217円267円/README.MD"
@@ -2,6 +2,7 @@
 
 ??恰絵??コ???埦????∞?域?榊??絨???桁9
 ???
+
 - [oppo???腴?16菴????](https://mp.weixin.qq.com/s?__biz=Mzg3NzU5NTIwNg==&amp;mid=2247498750&amp;idx=1&amp;sn=19fe8b4fff28fe81db14e733053bbc74&amp;chksm=cf2224d7f855adc1d0984980a4e3de31fe33329164a472ca8d8255a8a80b69b2e23850811323&token=2001057130&lang=zh_CN#rd)
 - [絨???????腴???菴???卡?????膈?罅?鐚?](https://mp.weixin.qq.com/s?__biz=Mzg3NzU5NTIwNg==&amp;mid=2247498316&amp;idx=1&amp;sn=7749b78293b7b2af51eda99844e08a56&amp;chksm=cf222565f855ac7324232e2af459f8b6e6eb5fd5b272c2b29bda08cc579421b6704a0de94b2e&token=2001057130&lang=zh_CN#rd)
 - [??乗佉篋????腴?15菴???卡??](https://mp.weixin.qq.com/s?__biz=Mzg3NzU5NTIwNg==&amp;mid=2247498171&amp;idx=1&amp;sn=f5a7ec25a569822be0f73fbcd413e8ba&amp;chksm=cf222692f855af84fba419166fcd4235c0e78af3a2e1ec4c723a4efb1bd1ad6f8a5b9404c599&token=2001057130&lang=zh_CN#rd)
@@ -10,9 +11,11 @@
 - [??∵??綽?紊?鐚???丞?勖????∞?15菴????](https://mp.weixin.qq.com/s?__biz=Mzg3NzU5NTIwNg==&amp;mid=2247497256&amp;idx=1&amp;sn=3b799c2d514aa25e85a6faa60d639a0b&amp;chksm=cf222901f855a017b73356b99b830b8800a7a9172fab891c5759d8dd69a270872ea9480c0b7c&token=2001057130&lang=zh_CN#rd)
 - [絎?絎???&gt;?????????????膸???檎?∵??蘂?茹f??](https://mp.weixin.qq.com/s?__biz=Mzg3NzU5NTIwNg==&amp;mid=2247495342&amp;idx=1&amp;sn=54e1c0c16a6467001524c34818025331&amp;chksm=cf223187f855b89140db5ca429e6efc19d0111abf7f36b78a0ecd73b00fded1ff1e7ba32a6f1&token=2001057130&lang=zh_CN#rd)
 - [????????????筝????????????膸???檎?∵??蘂?茹f??](https://mp.weixin.qq.com/s?__biz=Mzg3NzU5NTIwNg==&amp;mid=2247493270&amp;idx=1&amp;sn=1c78a81d6e1bd0f0fd947fe8c3a33e32&amp;chksm=cf2239bff855b0a9627855f20a17799e0506eb7548a409bfa0ee0450328d7519ec70f7b962cc&token=2001057130&lang=zh_CN#rd)
-???
-## 2. 綽????膸???檎?∵??蘂?
-???
+ ???
+ 
+ ## 2. 綽????膸???檎?∵??蘂?
+ 
+ ???
 - [Redis筝私??????????泣?? Cluster???臂や?????腴姒??](https://mp.weixin.qq.com/s?__biz=Mzg3NzU5NTIwNg==&amp;mid=2247498254&amp;idx=1&amp;sn=6489360c3b226df9811e66cb40ec7656&amp;chksm=cf222527f855ac3112628bcec7730064fee3fdbe869fbd0a7410c22766a0c036a7e5c1a69fa0&token=2001057130&lang=zh_CN#rd)
 - [???篁コ減篁?箙?荀????綺????茵Ǎ??](https://mp.weixin.qq.com/s?__biz=Mzg3NzU5NTIwNg==&amp;mid=2247498625&amp;idx=1&amp;sn=0d7bd9d1b46eeff4c715a6761355e9b0&amp;chksm=cf2224a8f855adbea8931c8e011711f6c70cffeef8ddf8b87729c710eacef11b46eef80fda36&token=2001057130&lang=zh_CN#rd)
 - [??∵??綽?紊?鐚???????MySQL???筝私??](https://mp.weixin.qq.com/s?__biz=Mzg3NzU5NTIwNg==&amp;mid=2247497982&amp;idx=1&amp;sn=bb589329cceb5462fc41f66ec63dbf56&amp;chksm=cf2227d7f855aec16dd4d3b3425c0401850eeaf2c9cdc82e82722d38a00c24ee9ccfa3353774&token=2001057130&lang=zh_CN#rd)
@@ -22,7 +25,7 @@
 - [???筝????絨援??茹o??IO罔≦??莚?В](https://mp.weixin.qq.com/s?__biz=Mzg3NzU5NTIwNg==&amp;mid=2247496448&amp;idx=1&amp;sn=cd502f850290a25949dd4a11ac55a039&amp;chksm=cf222c29f855a53f094bde2868900fa252b07385e73564e9ee9f0510cb4e74387d9d23ab67e6&token=2001057130&lang=zh_CN#rd)
 - [???筝????絨援??茹o??MVCC??????莚?В](https://mp.weixin.qq.com/s?__biz=Mzg3NzU5NTIwNg==&amp;mid=2247495277&amp;idx=1&amp;sn=a1812febb4246f824ce54d778f672025&amp;chksm=cf223144f855b8528ad6cce707dc3a1b4d387817bd751dfab4f79dda90c6640f9763d25f3f33&token=2001057130&lang=zh_CN#rd)
 - [2W絖?鐚?莚?В20???Redis膸???檎?∵??蘂?鐚?鐚??????????鐚?](https://mp.weixin.qq.com/s?__biz=Mzg3NzU5NTIwNg==&mid=2247494124&idx=1&sn=c185f7d999d5f006608d05707a8a7eea&chksm=cf2236c5f855bfd329c6e2ee27f23f8131ebcd312960190a10f1a819d67f07a21a08ad17f263&token=162724582&lang=zh_CN&scene=21#wechat_redirect)
-- [筝?腱???号??鐚??「莅?Redis???絽?綣???????罩g`篏睡??紮水??](https://mp.weixin.qq.com/s?__biz=Mzg3NzU5NTIwNg==&mid=2247488142&idx=1&sn=79a304efae7a814b6f71bbbc53810c0c&chksm=cf21cda7f85644b11ff80323defb90193bc1780b45c1c6081f00da85d665fd9eb32cc934b5cf&token=162724582&lang=zh_CN&scene=21#wechat_redirect)
+- [筝?腱???号??鐚??「莅?Redis???絽?綣???????罩g`篏睡??紮水??](https://mp.weixin.qq.com/s?__biz=Mzg3NzU5NTIwNg==&mid=2247488142&idx=1&sn=79a304efae7a814b6f71bbbc53810c0c&chksm=cf21cda7f85644b11ff80323defb90193bc1780b45c1c6081f00da85d665fd9eb32cc934b5cf&token=162724582&lang=zh_CN&scene=21#wechat_redirect)
 - [??∵??綽?紊?鐚?TCP??顒勛????後??篋?菴???卡??](https://mp.weixin.qq.com/s?__biz=Mzg3NzU5NTIwNg==&mid=2247490868&idx=1&sn=96889bfe6a97f9200fa2d682cf2f5d89&chksm=cf21c21df8564b0b0757df584560a69340b1775fe1c70b867439565969ec3aed19c442ff4eeb&token=162724582&lang=zh_CN&scene=21#wechat_redirect)
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 - [ZooKeeper??????篋?菴???卡??篏?蕁九??篋????鐚?](https://mp.weixin.qq.com/s?__biz=Mzg3NzU5NTIwNg==&mid=2247488047&idx=1&sn=4913c7e1c3b8835f7512d8dc6b845727&chksm=cf21cd06f8564410cce6121230256facb1ab3b5a9ed35579896f428d84bdea7b86836109d575&token=162724582&lang=zh_CN&scene=21#wechat_redirect)
diff --git "a/Java351円235円242円350円257円225円351円242円230円351円233円206円347円273円223円345円217円267円/mybatis/mybatis351円235円242円350円257円225円351円242円230円/mybatis351円235円242円350円257円225円351円242円230円.md" "b/Java351円235円242円350円257円225円351円242円230円351円233円206円347円273円223円345円217円267円/mybatis/mybatis351円235円242円350円257円225円351円242円230円/mybatis351円235円242円350円257円225円351円242円230円.md"
index 23b5ef7..2afe9c1 100644
--- "a/Java351円235円242円350円257円225円351円242円230円351円233円206円347円273円223円345円217円267円/mybatis/mybatis351円235円242円350円257円225円351円242円230円/mybatis351円235円242円350円257円225円351円242円230円.md"
+++ "b/Java351円235円242円350円257円225円351円242円230円351円233円206円347円273円223円345円217円267円/mybatis/mybatis351円235円242円350円257円225円351円242円230円/mybatis351円235円242円350円257円225円351円242円230円.md"
@@ -1,21 +1,41 @@
 ### mybatis
-1. mybatis 筝? #{}??? ${}?????阪????壚??箙?鐚?
-2. 篁?箙????SQL羈???? 鐚?絋?篏???水?????
-3. 莚岩??筝? mybatis ???筝?膾х??絖????篋?膾х??絖?
-4. mybatis ??????壩??綮区?????莉緒??綮区?????莉順??????????壚??箙?鐚?
-5. mybatis ??????sql筝TEL戎???<where>???膈鞘????贋・???where??渇???????篁?箙???阪????
-6. mybatis ??????sql???膈鞘賢緇?ッ???膈鞘賢?????ŭ??絮???э??????????篏???????
-7. mybatis ??? hibernate ?????阪???????ŭ??鐚?
-8. RowBounds??壚??罨≧?ф?ヨ哆?????????????鐚?筝坂??箙?鐚?
-9. MyBatis 絎?箙?????・???????箙???上?医???ー???鐚?
+1. mybatis 筝? #{}??? ${}?????阪????壚??箙?鐚?
+ #{}??奝??膽?莚????篏?膃???篌?菴?茵?膠糸??莉シ?√??SQL羈???ラ?我?わ??${}?????膃?顕??炊??????贋・??惹・SQL鐚????SQL羈???ラ????í??
+2. 篁?箙????SQL羈???? 鐚?絋?篏???水?????
+ SQL羈???ユ?壩?糸?肢?????菴???惹・SQL莚上媳?ユ?ц????倶?鋌g???????水????号??鐚?篏睡????膽?莚?莚上嫮??絋?MyBatis???#{}鐚?鐚?絲合????決????ヨ??茵???♂?????菴?羯ゃ??
+3. 莚岩??筝? mybatis ???筝?膾х??絖????篋?膾х??絖?
+ 筝?膾х??絖????SqlSession膾у????鐚?藥?莅ゅ????姒??篋?膾х??絖????Mapper膾у????鐚????荀????臀?????姒??紊?筝?SqlSession??延昆???
+4. mybatis ??????壩??綮区?????莉緒??綮区?????莉順??????????壚??箙?鐚?
+ ??壩??????????????????荀???狗??菴?AOP????????????絎??ー膠誌??莪??????九???サ???莉遵?活????井?勉??
+5. mybatis ??????sql筝TEL戎???<where>???膈鞘????贋・???where??渇???????篁?箙???阪????
+ <where>???膈鞘?????????ゆ?中?&gt;散?????????Ǎ???????羞糸??WHERE??渇????鐚?綛九?????紊?篏?AND/OR鐚???贋・???WHERE???荀???????紊???????
+6. mybatis ??????sql???膈鞘賢緇?ッ???膈鞘賢?????ŭ??絮???э??????????篏???????
+ <foreach>???膈丈??collection鐚???????鐚????item鐚????膣???????鐚????index鐚?膣√????????鐚????open鐚?綣?紮?膃?埦?????separator鐚???????膃??????close鐚?膸????膃?埦??膈?絮???с??
+7. mybatis ??? hibernate ?????阪???????ŭ??鐚?
+ MyBatis??????????ORM鐚????荀????????????SQL鐚?Hibernate?????????ORM鐚???????????SQL???MyBatis??雁?究柑鐚?Hibernate??贋?剛梢???
+8. RowBounds??壚??罨≧?ф?ヨ哆?????????????鐚?筝坂??箙?鐚?
+ ??夌?????RowBounds???菴????絖????蕁球???ー鐚?綺?絮?菴???壚??罨≧?ф?ヤ??????????井?卡?????Java絮???∵??茵?????????
+9. MyBatis 絎?箙?????・???????箙???上?医???ー???鐚?
+ ???菴??・?????????絎???????Mapper.xml筝中?ユ?上噲綺????SQL莚上媢??筝阪???ー???
 10. Mybatis???綺?絮?絎??ー?????????
+ ???菴????絨??????????篁g?????OGNL茵?松綣靁??????姒??絨?Java絲壕院筝?SQL莚上媺??茵????絨?鐚???ц????井???????篏????
 11. Mybatis?????篏?菴?茵????蕁窮??鐚????蕁究??篁句??????????壚??箙?鐚?
+ ?櫆札???菴?RowBounds???SQL莚上嫮??絋?limit鐚????蕁泣?????蕁究??篁狗??菴?????????????SQL鐚????SQL???羞糸??limit莚上媱???ー???
 12. Mybatis??ц????拷???????ワ????処???????井????筝脂????茵????鐚?
+ ?櫆札鐚????菴????臀?useGeneratedKeys="true"???keyProperty???絎?筝脂????罧泣??
 13. Mybatis??醇????ŭ??Executor??ц????Ǎ??絎?篁コ????雁????阪????壚??箙?鐚?
+ SimpleExecutor鐚?膊??????ц????Ǎ?????ReuseExecutor鐚????????Statement??ц????Ǎ?????BatchExecutor鐚???劫???????ц????Ǎ?????ReuseExecutor鐚????????Statement??ц????Ǎ?????CachingExecutor鐚?膽?絖???ц????Ǎ???????阪?????篋?Statement??????????????劫????????膽?絖?膈???ヤ????????
 14. Mybatis??????sql???篁?箙???Ǎ????ц????????鐚??????ŭ????????sql鐚?
+ ??????SQL???篋???号?勌???????&gt;散??惹・SQL莚上媠???????????MyBatis?????茵???倶?号?勌????ュ????逸?????菴?OGNL茵?松綣頵f??XML筝下?????膈常??????????????SQL??????膈丈??<if>???<choose>???<when>???<otherwise>???<foreach>???<div class="naked_tr">???<where>???<set>膈????
 15. mybatis??????腱????蕁究?劫???
+ 絽梧????????RowBounds???蕁泣????ñ?????蕁居??SQL莚上??limit鐚???????蕁究??篁九??蕁泣??
 16. MyBatis罅???句??篌???劫??膽榊??
+ 篌???刻??SQL??究柑鐚?絖?????牙鎖綛括??鐚???ц?処??絅純??膽榊?刻?????荀?膽????SQL鐚?絲劫???????ヨ哆膸贋?ゆ?х??綏勉??
 17. 篏睡??MyBatis罅???駈??綵?絎?篏?膠私賢???絮???у?????茵?筝下??絖?罧球??筝?筝???? 鐚????箙???? 鐚?
+ ?櫆札???菴?resultMap???膈乗??茵?絖?罧灸??絮???х?????絨?鐚??????????SQL筝TEL戎????????????
 18. ???絽娯??筝?Xml???絨????篁駈????巡?????筝?筝?Dao?・????箙?絲劫??鐚?莚潔?卡??菴?筝?Dao?・????綏ヤ??????????壚??箙?鐚?Dao?・?呢???????号??鐚??????遺???????駈????号????初??莉遵??鐚?
+ 綏ヤ??????????奝??菴??・?????????絎??????上?医噲綺????Mapper.xml???篁倶?ц??SQL????・?吨?号??筝???初??莉緒??MyBatis???菴???号?????????????亥瓜?????阪????号?????
 19. Xml???絨????篁銀賢鐚???や??絽梧?????select&#124;insert&#124;updae&#124;delete???膈鞘??紊?鐚?菴??????ŭ?????膈常??
-20. 膊?菴?Mybatis??????篁区??茵???????鐚?篁ュ??絋?篏?膽????筝?筝???篁吟??
\ No newline at end of file
+ 菴????<resultmap>???<sql>???<insert>???<update>???<delete>???<select>???<if>???<choose>???<when>???<otherwise>???<foreach>???<div class="naked_tr">???<where>???<set>膈????
+20. 膊?菴?Mybatis??????篁区??茵???????鐚?篁ュ??絋?篏?膽????筝?筝???篁吟??
+ ??????鐚?MyBatis???菴???????篁g????????Mapper?・????篁g??絲壕院鐚????篁狗??菴?絎??ーInterceptor?・???????intercept??号??筝中????Executor???StatementHandler???ParameterHandler???ResultSetHandler膈?絲壕院?????劫????号??鐚?菴?茵?紜?綣阪????????膽???????篁狗??荀?絎??ーInterceptor?・??????????intercept???plugin???setProperties??号??鐚?綛九????臀勖??篁銀賢羈???????
\ No newline at end of file
diff --git "a/Java351円235円242円350円257円225円351円242円230円351円233円206円347円273円223円345円217円267円/345円210円206円345円270円203円345円274円217円/345円210円206円345円270円203円345円274円217円351円235円242円350円257円225円351円242円230円.md" "b/Java351円235円242円350円257円225円351円242円230円351円233円206円347円273円223円345円217円267円/345円210円206円345円270円203円345円274円217円/345円210円206円345円270円203円345円274円217円351円235円242円350円257円225円351円242円230円.md"
index afc09b8..9800386 100644
--- "a/Java351円235円242円350円257円225円351円242円230円351円233円206円347円273円223円345円217円267円/345円210円206円345円270円203円345円274円217円/345円210円206円345円270円203円345円274円217円351円235円242円350円257円225円351円242円230円.md"
+++ "b/Java351円235円242円350円257円225円351円242円230円351円233円206円347円273円223円345円217円267円/345円210円206円345円270円203円345円274円217円/345円210円206円345円270円203円345円274円217円351円235円242円350円257円225円351円242円230円.md"
@@ -1,11 +1,24 @@
-### ???絽?綣? 
+### ???絽?綣?
+
+絅順??鐚?篁ヤ????壩??蕁阪?????膈??????勰?????莨???榊?????鐚?
+
 1. 莚頑????絽?綣鋋???\?????絽?綣鋋???∞??茹e?恰?号??
+ 膈?鐚????絽?綣鋋???≧?壩??羔????紊?筝??ス???????≧????井???????篋???\??菴?篋??????≧????井?????櫝?巡??篋?筝?????????ñ??篏?臀勉?????絽?綣鋋???∞??茹e?恰?号???????コ犬??倶侊???篋わ??2PC鐚????筝???倶侊???篋わ??3PC鐚????茵ュ?推????\??TCC鐚??????サ?井????虁;???羔???奝?????篋???∞?????
 2. 篁?箙??????絽?綣靗紫??鐚?
+ 膈?鐚????絽?綣靗紫????壩????怨??筝??ス??莅∞????榊????????膤紫??鐚?菴?篋?莅∞????咲??菴?臀?膸???娯?????篆≦????顖?鐚???怨??絎??????劫?????篁糸?&lt;?????絽?綣靗紫???????合?号?奝???櫜????с???櫐?ï????у??絎拷????с??
 3. 莅画佪CAP???綽泣??
+ 膈?鐚?CAP???綽究?壩????????絽?綣靗紫??筝昭和??筝???贋?э??Consistency鐚?????櫜????э??Availability鐚?????????阪俉?????э??Partition Tolerance鐚?菴?筝?筝?????уŰ?遵????倶察莇喝?銀賢筝や肩???筝???贋?ф?壩?????????????劫?????筝???狗?雁????亥????井?勖?壚????雁??鐚??櫜????ф?壩??罸鋇?噯羆???処?遵????医??綺?鐚??????阪俉?????ф?壩??膤紫?????????亥??膸??????堺?銀????順薩膸左??茵????
 4. ???箙????茹e失筝???贋?с?????莪?筝???贋?у?????膸?筝???贋?э??
+ 膈?鐚?綣坂????贋?ф?壩?????????????劫?????筝???狗?雁????亥????井?勖?壚????雁??鐚?篁私??筝?罨∴嚞??処?巡??莚?莚糸?井????亥?????鐚????莪?筝???贋?ф?壩??絋?????????壕嚞?????井??筝??井?勰々?????種?????膸左嚞???莚ユ?井?勰々?????寂??篌?罸?箙????莚糸???????惹?贋?э?????膸?筝???贋?ф?壩??膤紫??????颷?筝?罧究?狗?翫??鐚????????????号??膸?篌?莨上?遺????雁????倶??鐚?篏?筝?篆?莚????篁紙????九?紙??????????拷?巡????眼??
 5. 絋?篏?絎??ー???絽?綣????鐚?
+ 膈?鐚????絽?綣?????櫆札???菴?紊?腱???劫?鎘??ー鐚?絽梧??????????坂????井???????????????坂??Redis???????????坂??Zookeeper??????膈??????坂??Redis?????????絽娯戎???SETNX??巡擦絎??ー鐚???坂??Zookeeper?????????絽娯戎???筝贋?狗〆綺??????劫???ー???
 6. 絋?篏?絎??ー???絽?綣? Session?
+ 膈?鐚????絽?綣?Session?櫆札???菴?紊?腱???劫?鎘??ー鐚?絽梧??????????坂????井???????Session??延昆?????坂??Redis???Session??延昆?????坂??Nginx???Session sticky膈??????坂??Redis???Session??延昆?????Session??井??????????Redis筝昭和?????????????∴????劫?延昆???筝?筝?Redis絎?箴????
 7. 茣?莉遵??茵∞?????茹o??
+ 膈?鐚?茣?莉遵??茵≧?壩??絨?臀?膸?羌???????莅∞??篁糸?≦???????医???????医??筝?????≦??筝?鐚?篁ユ??蕭?膤紫???????ц?純????????у???櫐?ï????с??茣?莉遵??茵≦櫆札???菴?隋コ散莅上??鐚?絋?F5鐚????莉壚散鐚?絋?Nginx???HAProxy鐚?絎??ー???
 8. ???絽?綣????臂や??絋?篏??????医?壚??綺?????埦??
+ 膈?鐚???????絽?綣????臂や??????????壚??綺?????垸櫆札???菴?紊?腱???劫?鎘??ー鐚?絽梧????????UUID???Snowflake膊?羈??????井?????????ID???Redis???絖????篏?膈????Snowflake膊?羈???壚??腱????絽?綣?ID??????膊?羈?鐚?膸????篋???狗?贋?潟????阪??ID???綺?????埇???????壚??ID???
 9. ???絽?綣鋋????
+ 膈?鐚????絽?綣鋋???≧?壩??羔????紊?筝??ス???????≧????井???????篋???\??菴?篋??????≧????井?????櫝?巡??篋?筝?????????ñ??篏?臀勉?????絽?綣鋋???∞??茹e?恰?号???????コ犬??倶侊???篋わ??2PC鐚????筝???倶侊???篋わ??3PC鐚????茵ュ?推????\??TCC鐚??????サ?井????虁;???羔???奝?????篋???∞?????
 10. 篁?箙???壚????贋??hash???
+ 膈?鐚?筝???贋?у??絽???壚??腱???号????????絽?膊?羈?鐚????篋???????絽?綣靗紫??筝上????井?????????医??絽???医??筝?????剛?????筝???贋?у??絽????菴?絨???井?????????号??絨???遺??筝?ッ綵√??絽?腥咲?器??篏水?????????劫???????駈???Ŭ??????????井?勰??荀??????医??絽?鐚?篁??????鎞???井?勤??腱紫??綣???????
diff --git "a/Java351円235円242円350円257円225円351円242円230円351円233円206円347円273円223円345円217円267円/346円223円215円344円275円234円347円263円273円347円273円237円/346円223円215円344円275円234円347円263円273円347円273円237円351円235円242円350円257円225円351円242円230円.md" "b/Java351円235円242円350円257円225円351円242円230円351円233円206円347円273円223円345円217円267円/346円223円215円344円275円234円347円263円273円347円273円237円/346円223円215円344円275円234円347円263円273円347円273円237円351円235円242円350円257円225円351円242円230円.md"
index f854380..1535849 100644
--- "a/Java351円235円242円350円257円225円351円242円230円351円233円206円347円273円223円345円217円267円/346円223円215円344円275円234円347円263円273円347円273円237円/346円223円215円344円275円234円347円263円273円347円273円237円351円235円242円350円257円225円351円242円230円.md"
+++ "b/Java351円235円242円350円257円225円351円242円230円351円233円206円347円273円223円345円217円267円/346円223円215円344円275円234円347円263円273円347円273円237円/346円223円215円344円275円234円347円263円273円347円273円237円351円235円242円350円257円225円351円242円230円.md"
@@ -1,22 +1,44 @@
 ### ???篏?膤紫??
 1. Linux膤紫??筝?篏???恰絵菴???ŭ???????後????逸??莚頑?篏???ラ????????
+膈?鐚??????恰絵菴????筝?篋??????後????医?????net.core.somaxconn???net.ipv4.tcp_tw_reuse???vm.swappiness膈????net.core.somaxconn???篋??ァ??句????ソ???????????紊ч?水墾鐚?net.ipv4.tcp_tw_reuse???篋??ァ???TIME_WAIT??倶?????絅??・絖??????櫆札茴?????Ǎ??vm.swappiness???篋??ァ??九????娯戎???篋ゆ?∝Ã??雁????上?????
 2. epoll???poll???篁?箙???阪????
+膈?鐚?epoll???poll??醇??I/O紊?莊????????阪?駈??篏?epoll???紊????紊ч?????篁倶?颷亥???倶???????顔?????poll篏睡??舟莚∽?劫?閈???ユ??篁倶?颷亥??????倶??鐚????epoll篏睡??篋?篁狗o?????阪?駈???Ű???????????????????????篁倶?颷亥????罩ゅ??鐚?epoll??壩??莨合??茹???鐚?ET鐚????羂翫抗茹???鐚?LT鐚?筝ょ??罔≦??????poll?Ŭ?壩??羂翫抗茹??????
 3. 膾推??CPU???蕭?鐚?莚潔?勌??絋?篏???上?育?勰???????????
+膈?鐚?薤????鐚????篌?篏睡??top??巡擦??ョ??CPU篏睡????蕭????菴?腮?鐚???九??篏睡??ps??巡擦菴?筝?罩ユ?ョ??莚ヨ??腮????莚???篆≧?壔???・???鐚????篌?篏睡??strace???gdb綏ュ?決??荼?唫菴?腮????膤紫??莪?????????ц????倶??鐚???上?阪嚩???CPU蕭?茣?莉順????隙???????????
 4. Linux筝?IO罔≦????????腱?鐚????????????????壚??箙????
+膈?鐚?Linux筝?IO罔≦?????篋?腱?鐚?????????奝?糸??IO????????糸??IO???IO紊?莊?????????篆≦埌o???IO???綣?罩?IO?????糸??IO篌???糸??菴?腮???翫?井?井????紊?絅緒???????糸??IO篌?腴???活?????筝?筝???莚夌??鐚?菴?腮????荀?莉勤哆罍???ユ?井?勖????葦膸???IO紊?莊??????篏睡??select/poll/epoll膈?膤紫??莪????????サ??筝???篁倶?颷亥?鐚?篆≦埌o???IO???菴?篆≦埌????ヨ??腮???井??葦膸???綣?罩?IO??怨????後???????井?勤嚞???鐚?菴?腮???????膈?緇????
 5. top ??巡擦箙?????????ŭ?????絎刻?????篁?箙?篏???????
+膈?鐚?top??巡擦??丞ず??????絎劫????セ??腮?ID鐚?PID鐚?????????件??USER鐚????CPU篏睡????鐚?%CPU鐚???????絖?篏睡????鐚?%MEM鐚?????????????絖?篏睡?????VSZ鐚????絽檎Ä???絖?篏睡?????RSS鐚??????巡擦茵?鐚?COMMAND鐚?膈????菴?篋?篆≧?夌??篋?????ァ膤紫??筝上??筝???腮????莎?羣?篏睡???????居??絽??ò???????羣?羔????紊х??菴?腮????
 6. 菴?腮????篆≧?????腱???劫???
-7. 莚頑?菴?腮????莪?綺???羈?
-8. 絽梧????????腱????絖?膊∞????阪??
+膈?鐚?菴?腮????篆∞????劫???????ス?♂??鐚?Pipe鐚??????遵??膊♂??鐚?Named Pipe鐚????羔???奝?????鐚?Message Queue鐚??????延昆???絖?鐚?Shared Memory鐚????篆≦埌???Semaphore鐚????絅??・絖?鐚?Socket鐚?膈????
+7. 莚頑?菴?腮????莪?綺???羈????
+膈?鐚?菴?腮????莪?綺???羈??????サ????ュ???????\??FCFS鐚??????TEL??筝?篌????鐚?SJF鐚????篌????膾ц??綺?????狗?雁??莉勤習鐚?RR鐚????紊?膾у??薤???????莪?綺??????FCFS???菴?腮???域松蕁阪?顖?綺???SJF?????ð?ц????狗?贋????下??菴?腮?鐚?篌????膾ц??綺??号?勤??腮?篌????膾ц??綺???RR?????狗?雁??莉勖??莪?綺???紊?膾у??薤???????膸????篌????膾у????狗?雁??莉勤習???
+8. 絽梧????????腱????絖?膊∞????阪?吟??
+膈?鐚?絽梧????????絖?膊∞????阪?九????サ??蕁居??Paging鐚???????罧居??Segmentation鐚????罧級ゝ綣??Segmented Paging鐚?????????????絖?鐚?Virtual Memory鐚?膈???????蕁球?????絖???????筝阪?阪??紊у?????蕁居?????罧球?????絖???????筝咲?肢??罧居??罧級ゝ綣靳???????罧球?????蕁居???????????絖????莅梧??腮?篏睡??罸???ñ?????絖???翫ぇ?????医??腥咲?眼??
 9. 篁?箙???虁????????絖?(Virtual Memory)?
-10. ???絖?臀勖?∝??羈?
+膈?鐚??????????絖???壚??腱????絖?膊∞???????姒?????莅御??篏?膤紫??絨?隋ス??腥咲?岩??筝阪??絖?篏睡?Ǎ??筝堺?鋇???腮????箴???ス????????菴?膸下????医??腥咲?眼???????????絖?篏水??菴?腮??櫆札莅翠?勖????ñ?????絖???翫ぇ?????医??腥咲?器??綛狗??菴????蕁究?阪?九???ー??ñ?????絖????隋ス??箙???雁????井?勌困??≪??
+10. ???絖?臀勖?∝??羈????
+膈?鐚????絖?臀勖?∝??羈??????シ??篏括舟?????OPT鐚???????菴??????削??FIFO鐚???????菴????絨?篏睡?Ǎ??LRU鐚???????筝?膸鎵娯戎??Ǎ??LFU鐚?膈????OPT?????ð???ユ??箙?筝?篌?篏睡????蕁級?∝舟?????FIFO?????ð????ò????ュ??絖????蕁級?∝舟?????LRU?????ð??菴????絨?篏睡????蕁級?∝舟?????LFU?????ò倧??勖???井??絨????蕁級?∝舟??≪??
 11. ????????医???????肢????医?????膾炊?у?医???????ñ????医???????阪????
-12. ???篏?膤紫?????蕁球?鎕????
-13. 菴?腮????膾睡???????阪??
-14. socket絎∽?欠?????????∞????篆∴??腮?
+膈?鐚?????????医????虁??腮?篏睡??????医??鐚???肢????医????夌??綺鋇下????医??鐚?膾炊?у?医????夌?颷?罧球?????絨?????????医??鐚???ñ????医???????絖?筝下??絎??????医?????????????医?????菴?蕁笈;???絨???亥鎖??у?医??鐚???????菴?蕁笈;???絨???亥?ñ????医?????
+12. ???篏?膤紫?????蕁球?鎕???????
+膈?鐚?蕁球?鎕??????壚??腱????絖?膊∞????劫???絨????絖???????筝阪?阪??紊у?????蕁究??鐚?菴?腮???医??腥咲?翫?????筝阪ぇ絨???後?????蕁泣?????菴?蕁笈;絨???????蕁究??絨???亥?ñ??蕁究??鐚?絎??ー?????????絖??????ñ?????絖?箙???雁????井?勌困??≪??
+13. 菴?腮????膾睡???????阪????
+膈?鐚?菴?腮???虁??羣????????????堺?サ??篏?鐚???ユ????ス???????医??腥咲?翫??膤紫??莎?羣?鐚?膾睡?????CPU莪?綺?????堺?サ??篏?鐚???延昆菴?腮????莎?羣????菴?腮???翫????√?????紊э??膾睡????翫????√?????絨??菴?腮???顔??篆♂??荀????菴?IPC??阪?駈??膾睡????翫櫆札??贋・??延昆???絖????
+14. socket絎∽?欠?????????∞????篆∴??腮????
+膈?鐚?socket絎∽?欠?????????∞????篆∴??腮??????ロ???????∞????綮?socket綛句??絎???医??鐚??????セ???・莚傑??鐚?絎∽?欠????綮?socket綛区???・?????∞?鐚??????∞??・???菴??・鐚?綮榊?????篆\???????拷??菴?send/recv膈???醇?医?????????・??倶?井?卡?????篆∞??????????渇??socket???
 15. 綵怨??莪?綺???綺????????????壚??箙?鐚?
+膈?鐚?綵怨??莪?綺???綺???????????????サ??綺???狗?眼?????習??狗?眼??膈?緇???狗?眼??????????靁???????綺???狗?贋?壚??莚傑????育??罨≦??綺??????狗?器?????習??狗?贋?虁??腮?篁????篋ゅ?医??????????狗?器??膈?緇???狗?贋?虁??腮????絨援鯖??????筝下????狗?器????????????????篏???狗?翫??絎???????菴?腮???違??
 16. 菴?腮???雁?倶???????ŭ??鐚?
-17. 筝?筝?鎖腮???????絖?筝上??篏?絖???Ǎ??
-18. ??球宛菴?腮???壚??箙?鐚?絋????篋х??筝?筝??球宛菴?腮?鐚?絋?篏???ユ?上?球宛菴?腮?
-19. 筝?筝???腮????20筝?鎖腮?鐚???????筝?鎖腮?筝左?????fork鐚???亥??菴?腮?篌????20筝?鎖腮????鐚?
-20. 篁?箙???? RR 莪?綺???羈?鐚?
-21. 篁?箙???? DMA鐚???贋・???絖?莅翠?卡??鐚?
+膈?鐚?菴?腮???雁?倶???????シ?医産鐚?New鐚????絨援鯖鐚?Ready鐚????菴?茵?鐚?Running鐚????膈?緇?鐚?Waiting鐚????膸?罩???Terminated鐚?膈??????医産??虁??腮????綮堺?句????倶??鐚?絨援鯖??夌??緇?CPU莪?綺?????倶??鐚?菴?茵???虁??腮???????CPU??ц???????倶??鐚?膈?緇???虁??腮?膈?緇????篋?篁句????倶??鐚?膸?罩∽?虁??腮???ц??絎?罸??????倶?????
+17. 筝?筝?鎖腮???????絖?筝上??篏?絖???Ǎ??
+膈?鐚?筝?筝?鎖腮???????絖?筝上??????????ス鎖腮??ァ??九??鐚?TCB鐚??????????絲?絖?????????TCB??????鎖腮??????倶?????篌????膾с???????????膈?篆≧?姒????????篋?絖????鎖腮????絮???????????????醇?域?????篆≧?姒??絲?絖??????篋?絖????鎖腮??????ц????倶?????
+18. ??球宛菴?腮???壚??箙?鐚?絋????篋х??筝?筝??球宛菴?腮?鐚?絋?篏???ユ?上?球宛菴?腮????
+膈?鐚???球宛菴?腮????群膸靳?罩≫????区??腮?絨????????九?区??羣?鐚?菴?腮???颷亥?????????榊?倶??鐚????菴?腮??????ユ?上?球宛菴?腮??櫆札篏睡??ps??巡擦鐚???ョ????倶??筝?Z???菴?腮?????櫆札篏睡??wait膤紫??莪???????kill??巡擦?????九?球宛菴?腮????
+19. 筝?筝???腮????20筝?鎖腮?鐚???????筝?鎖腮?筝左?????fork鐚???亥??菴?腮?篌????20筝?鎖腮????鐚?
+膈?鐚?筝?篌???????Linux筝昭和??fork膤紫??莪????篌?紊???句?区??腮??????医??腥咲?器??篏?筝?篌?紊???句鎖腮??????亥??菴?腮??Ŭ??筝?筝?鎖腮?鐚???活?????fork???膾睡?????
+20. 篁?箙???? RR 莪?綺???羈?鐚?
+膈?鐚?RR鐚?Round Robin鐚?莪?綺???羈???壚??腱???狗?雁??莉勤習莪?綺???羈?鐚?絨?CPU??狗?翫?????筝堺?狗?雁??鐚?莉勖????????膸????筝???腮????罸鋇???腮???ц??筝?筝??狗?雁?????鐚?莪?綺???綺鋍??????î??筝?筝???腮???ц??鐚???翫?井?????菴?腮???醇?ц??絎?罸????
+21. 篁?箙???? DMA鐚???贋・???絖?莅翠?卡??鐚?
+膈?鐚?DMA鐚?Direct Memory Access鐚???壚??腱????莅?I/O莅上????贋・莅翠?勛鎧膸????絖?????????姒????????CPU綛臥?????DMA?ァ??九????茣g?∞????井?勌??莨?鐚????蕭?膤紫?????I/O??ц?遵???????????
+
diff --git "a/Java351円235円242円350円257円225円351円242円230円351円233円206円347円273円223円345円217円267円/347円274円223円345円255円230,円Redis/Redis344円270円272円344円273円200円344円271円210円350円277円231円344円271円210円345円277円253円.md" "b/Java351円235円242円350円257円225円351円242円230円351円233円206円347円273円223円345円217円267円/347円274円223円345円255円230,円Redis/Redis344円270円272円344円273円200円344円271円210円350円277円231円344円271円210円345円277円253円.md"
index a3f6b30..4aa27e8 100644
--- "a/Java351円235円242円350円257円225円351円242円230円351円233円206円347円273円223円345円217円267円/347円274円223円345円255円230,円Redis/Redis344円270円272円344円273円200円344円271円210円350円277円231円344円271円210円345円277円253円.md"
+++ "b/Java351円235円242円350円257円225円351円242円230円351円233円206円347円273円223円345円217円267円/347円274円223円345円255円230,円Redis/Redis344円270円272円344円273円200円344円271円210円350円277円231円344円271円210円345円277円253円.md"
@@ -1,11 +1,9 @@
-
 ## ???荐?
 
 紊у侔絅遵??鐚??????壩?∞?域?榊??絨???桁9??????篁ソ?順?ラ??Redis緇?綽???絎?QPS?櫝松10筝?鐚?罸霡?莚傑????逸?????**Redis筝坂??箙?菴?箙?綽????**,??シ??絨?莊?紊у侔筝?莎桁6箙????
 
 ![](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/3880491879ed4a228d8f4213d987f6a3~tplv-k3u1fbpfcp-zoom-1.image)
 
-
 - ??コ???埦??**??∞?域?榊??絨???桁9**
 - [github??医??](https://github.com/whx123/JavaHome)鐚????莪∽?鋇?蘂?star
 
@@ -19,13 +17,10 @@
 
 ???篁ス?ラ??鐚?MySQL膣√??筝坂?????蕭???????鐚??????î??B+????????井?勛??????????九?????????????井?勛?????鐚?絨掩??櫆札莅î?????綺????/腮?綺???翫辱?????????筝?Redis?????井?勛?????&?????????????常??
 
-
 ![](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/4ddd7723cc0e4953b746b13db7a5cea3~tplv-k3u1fbpfcp-zoom-1.image)
 
-
 ### SDS膊??????????絖?膃?顕
 
-
 ![](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/0e68a18c50f149dda136fc9b1aa73ab8~tplv-k3u1fbpfcp-zoom-1.image)
 
 ```
@@ -33,13 +28,12 @@ struct sdshdr { //SDS膊??????????絖?膃?顕
 int len; //莅医??buf筝上群篏睡????腥咲??
 int free; // buf筝下Ã??牙Ã??顔?水墾
 char buf[]; //絖??????絎???????絎?
-}
-```
 
+```
 
 #### 絖?膃?顕??水墾紊????
 
-???C莚左??筝昭和??荀??キ???```??∞?域?榊??絨???桁9```菴?筝???膃?顕?????水墾鐚????荀?篁?紊翫??紮???????鐚?紊????綺?減O鐚?n鐚?;
+???C莚左??筝昭和??荀??キ???菴?筝???膃?顕?????水墾鐚????荀?篁?紊翫??紮???????鐚?紊????綺?減O鐚?n鐚?;
 ???Redis筝昭和?? 綏牙?????筝?筝?**len**絖?罧笈佖綵?綵????絖?膃?顕?????水墾???????贋・?キ?????喝櫽????狗?翫?????綺?減O(1)???
 
 #### ??鎞????絖??????医????????罨≧??
@@ -66,6 +60,7 @@ Redis 篏?筝坂??筝?K-V??????絖???井????鐚?絎?篏睡????筝?綣????絮???????絽????
 ???絽?茵???ユ?冗?????緇?綽???鐚??????合瓜篌寂??Java筝下??**HashMap**鐚?絎?莅ð??篁サ??**O(1)** ?????狗?翫?????綺?辱?????上?育???弱噲???薤???????菴?key莅∞?????絽???種????上?医噲綺???????絽?罅銀??臀卡????九??絎?篏????entry鐚????entry??上?医噲綺??????井?勉??
 
 ???篋?絨鋍?篌翫櫝?巡??????????卡??篏?緇????絽?茵?筝上????ュぇ?????井?勖?駈??筝???壚????????**???絽???牙??**??勰?????鐚???f?????絨延?????筝???ュ????
+
> **???絽???牙??鐚?** ???菴?筝???????key鐚?莅∞????坂????欠?????絽???種??絲取?頑?遵?????筝?筝???絽?罅銀賢???
 
 Redis筝坂??茹e?喝??絽???牙??鐚???????篋?**??上?????絽?**?????上?????絽???壩?????筝?筝???絽?罅銀賢鐚?紊?筝???膣????筝?筝??乗;??ヤ??絖?鐚?絎?篁コ????岩??罨∞????????菴??・???
@@ -85,12 +80,10 @@ Redis筝坂??茹e?喝??絽???牙??鐚???????篋?**??上?????絽?**?????上?????絽???壩??
 - 罸鋇?絮???醇??筝???≧??綺??????乗;鐚????綺?絮??????乗;????????????????????膣????
 - 莊活??茵???壩??綛喝?? O鐚?logN鐚?,?????? O鐚?N鐚?紊????綺????????号?ユ?常??菴??櫆札???菴?蕁阪????ф??篏???拷?鎀?????????鴻??
 
-
 #### ???膽ï??茵?ziplist
 
 ???膽ï??茵?ziplist?????茵?????絖???檎?勛?????綺?絮?絎??ー箙?筝????絎???夌?延??膤糸????号??膽??????????絖????????????????茵Ǎ?? 筝?筝?ziplist?櫆札??????紊?筝?entry鐚? 罸鋇?entry?櫆札篆?絖?筝?筝??水墾?????????絖?膃??亥??????????贋?逸??絋?筝?鐚?
 
-
 ![](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/4ce3da7cddbe4e6e94a775151664ed93~tplv-k3u1fbpfcp-zoom-1.image)
 
 - zlbytes 鐚?莅医????岩肩???膽ï??茵????????????絖?絖???????
@@ -101,14 +94,13 @@ Redis筝坂??茹e?喝??絽???牙??鐚???????篋?**??上?????絽?**?????上?????絽???壩??
 
 ??延?????絖????**菴?膸上?????**???鐚????篁ラ????????綺???綽??????
 
-
-## ???????????井?勛?????
+## ???????????井?勛?????
 
 Redis??壩??紊?腱???井???堺?ス瓜???鐚?罸霡???堺?ス瓜???絲劫??筝?????????井?勛?????鐚?罸霡???井?勛?????絲劫??筝?筝???欠??膽???????筝坂?????蕭???ц?緒??Redis莅乗?∴????紫????削????井?勛?????????????????膽??????右?????
 
 Redis??壚戎???絲壕院鐚?redisObject鐚???ヨ;腓堺?井????筝下??????種??綵????篁サ?? Redis 筝上??綮坂??筝????弱噲??駈????喝?????綮坂犬筝?噲莟\??筝?筝?噲莟≧?夌?????????弱噲??????噲莟\???Ί??筝??奝???弱噲?????弱噲莟&lt;??
+
 ```
-//??恰絵??コ???埦????∞?域?榊??絨???桁9
 typedef struct redisObject{
 //膠糸??
 unsigned type:4;
@@ -130,7 +122,6 @@ redisObject筝昭和??**type** 絲劫????????噲莟∞瓜???鐚???????String絲壕院???List
 
 ## ?????????膾睡??罔≦??
 
-
 ### ???膾睡??罔≦??鐚???水??篋?筝?筝??????????
 
 Redis?????膾睡?????鐚???九????壩??**Redis???臀?膸?IO???????弱噲莚糸??**??夌?延??筝?鎖腮???ュ???????????篏?Redis?????銀???????緒??罸?絋????箙???????綣?罩ュ????ゃ?????臂ゆ?井????罩ョ??膈?鐚?絎??????夌?演??紊????膾睡????ц????????
@@ -148,15 +139,14 @@ Redis??????膾睡??罔≦??鐚???水??篋?**CPU筝?綽?荀????筝?筝??????????**???**腴?篋?
 ### I/O 紊?莊??????
 
 篁?箙????I/O紊?莊?????Ǎ??
+
 - I/O 鐚?臀?膸? I/O
 - 紊?莊? 鐚?紊?筝???膸?菴??・
 - 紊???Ǎ??紊???????筝?筝?鎖腮????
 - IO紊?莊????????九??絨掩?壚??腱????罩?IO罔≦??鐚?絎?絎??ー篋?筝?筝?鎖腮??櫆札???茹?紊?筝???篁九媳??鐚?筝??????筝???篁九媳??絨援鯖鐚?絨沿?遵???????ュ???????綺颷?茵???後?????莚糸?????篏?鐚????羃≧?????篁九媳??絨援鯖???,絨延????糸??綺??????綺??篋ゅ??cpu???
- 
 
 ![](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/07838d0a48ef4b38acccb7b52e5435e1~tplv-k3u1fbpfcp-zoom-1.image)
 
-
> 紊?莊?I/O紊??????????櫆札莅ï??筝?鎖腮?蕭???????紊????紊?筝????・莚傑??鐚????Redis篏睡????epoll篏?筝?I/O紊?莊???????????夌??絎??ー???綛銀??Redis???昆???篋?篁九?????罔≦??絨?epoll筝下??菴??・???莚糸???????渇?右?処習??≫減篋?篁駈??筝??????膸?I/O筝?羌?換菴?紊??????狗?眼??
 
 ## ?????????絖???阪??
@@ -164,6 +154,7 @@ Redis??????膾睡??罔≦??鐚???水??篋?**CPU筝?綽?荀????筝?筝??????????**???**腴?篋?
 Redis??贋・???訓???綮坂??VM??阪?? 鐚?筝?篌???鋇???ス??膤紫??篌?莪????鎧膸???醇?医?????鐚?篌?羌?換筝?絎??????狗?翫サ腱糸?????莚傑?????
 
 **Redis????????????絖???阪?倶???ュ????** 
+
> ?????????絖???阪?九葦??壩????倶??筝?膸鎵梧倧??勛????井??(??傑?井??)篁????絖?篋ゆ?√?亥?????筝昭和??篁??????上?阪??茣窮?????絖?腥咲?雁??篋???九?????荀?莅翠?勛????井??(??中?井??)??????菴?VM?????遵櫆札絎??ー??欠?中?井????胼誌??篏睡?中?井?勌????????絖?筝KK????傑?井?勌??絖???亥????????菴???桁葦?櫆札??水?????筝阪??絖?筝?莇活????????莅翠?勰??綺???????????勰?????
 
 ### ??????筝????莪?
@@ -171,5 +162,3 @@ Redis??贋・???訓???綮坂??VM??阪?? 鐚?筝?篌???鋇???ス??膤紫??篌?莪????鎧膸????
 - [Redis箙?VM??阪??](https://www.codenong.com/cs106843764/)
 - [筝???????????膾睡?????Redis筝坂??箙?菴?箙?綽??](https://zhuanlan.zhihu.com/p/57089960)
 - [羇?絲?&#124;Redis?????膾睡?????鐚?篏?Redis筝坂??箙?菴?箙?綽???](https://zhuanlan.zhihu.com/p/42272979)
-
-
diff --git "a/Java351円235円242円350円257円225円351円242円230円351円233円206円347円273円223円345円217円267円/347円274円223円345円255円230,円Redis/Redis347円274円223円345円255円230円351円235円242円350円257円225円351円242円230円.md" "b/Java351円235円242円350円257円225円351円242円230円351円233円206円347円273円223円345円217円267円/347円274円223円345円255円230,円Redis/Redis347円274円223円345円255円230円351円235円242円350円257円225円351円242円230円.md"
index 90fc9d3..9d81bf1 100644
--- "a/Java351円235円242円350円257円225円351円242円230円351円233円206円347円273円223円345円217円267円/347円274円223円345円255円230,円Redis/Redis347円274円223円345円255円230円351円235円242円350円257円225円351円242円230円.md"
+++ "b/Java351円235円242円350円257円225円351円242円230円351円233円206円347円273円223円345円217円267円/347円274円223円345円255円230,円Redis/Redis347円274円223円345円255円230円351円235円242円350円257円225円351円242円230円.md"
@@ -1,71 +1,497 @@
 ### 膽?絖?/Redis
-1. Redis???????ŭ????井?勛瓜???鐚?罸霡???井?勛瓜??????篏睡????堺??
-2. Redis膽?絖?腥翠?????膽?絖????刊???膽?絖???紫È??????鐚?篁ュ??茹e?恰?号??
-3. 絋?篏?篏睡??Redis??ュ???ー???絽?綣????鐚?redis???絽?綣???????篁?箙?膽咲?件??
-4. Redis ???箙??????阪?駈????????腱???劫???篌?膽榊?号?壚??箙?鐚????箙?絎??ー???鐚?RDB???AOF?????阪??
-5. Redis???臂わ??蕭??櫜?Ǎ???????????
-6. Redis?????井?勖??羆亥?????
-7. 筝坂??箙?荀????redis鐚?筝坂??箙?荀??????絖?鐚??????ŭ????堺?壚戎?????絖?
-8. redis篋???\??篋?茹e??鐚?篋?茹?Redis篋???∞??CAS???篏????
-9. 絋?篏?茹e?? Redis ???綛九??腴?篋?Key??勰?????
+1. Redis???????ŭ????井?勛瓜???鐚?罸霡???井?勛瓜??????篏睡????堺??
+ 膈?鐚?Redis絽悟??????井?勛瓜????????ロ??
+ * **絖?膃?顕鐚?String鐚?**鐚?絖????????????????弱噲鐚?絋??????隙??莚?篆≧?壔??莅≧?医???????延昆??倶??膈????
+ * **???絽?鐚?Hash鐚?**鐚?絖????絲壕院鐚?絋??????隙拭??姒????????ID筝咲?卡???????桁?????綛顔??膈?筝阪??罧球????種??鐚???????膸?????????井??????????
+ * **???茵Ǎ??List鐚?**鐚?絖???????綺????絖?膃?顕??????鐚?絋?羔???奝????????緇?????狗?雁鎖??????茵?网?鐚?膊???????鐚????
+ * **??????鐚?Set鐚?**鐚?絖???????綺鋇?筝????紊????絖?膃?顕鐚?絋????膈丞鎧膸??????怨??絅遵???????遵??羇糸?Ǎ???サ???鐚????
+ * **???綺???????鐚?Sorted Set鐚?**鐚?絖????筝????紊?絖?膃?顕鐚?筝?罸鋇???膣???活??筝?筝?????逸??絋????茵?网????絽?????????篁糸?♂????????
+2. Redis膽?絖?腥翠?????膽?絖????刊???膽?絖???紫È??????鐚?篁ュ??茹e?恰?号??
+ 膈?鐚?
+ * **膽?絖?腥翠??**鐚???????鐚?紊ч?顓傑????ヨ哆筝?絖????????井?卡??膽?絖?筝???巡賢鐚?莚傑????????????井?井???????茹e?恰?号??鐚??・????紜??????♂??鐚?絋?ID綽?蕁糸ぇ篋?0鐚?膽?絖?腥阪噲莟\??莅丞舟莨???下??TTL鐚?鐚?絽????菴?羯ゅ?Ǎ??Bloom Filter鐚????
+ * **膽?絖????刊**鐚???????鐚?紊ч?靶?絖?Key?????九け???鐚???????Redis?????≦????削??絲取?翫ぇ??顓傑??羔???ユ?井???????茹e?恰?号??鐚?莅丞舟筝???????TTL??狗?器??篏睡??Redis???臂ゆ??蕭??櫜????э???????♂??膾э?????羌????
+ * **膽?絖???紫È**鐚???????鐚????筝??下??Key腦???九け???鐚?紊ч?顓傑???????区倧??勤唫Key鐚?絲取?贋?井??????????薨ゅ?????茹e?恰?号??鐚?篋???ラ??鐚?篆?莚??Ŭ??筝?筝?噯羆??サ??ュ??綛倶?贋?亥??絖?鐚?鐚???肢??菴????鐚?膽?絖?筝上??????肢??菴??????狗?器??????佂鎖腮?綣?罩ユ?贋?逸??鐚?羂娯??菴????鐚?筝?莅丞舟TTL鐚?篏????荀?蘂?紊???阪?倶????ユ?井??????器?????
+3. 絋?篏?篏睡??Redis??ュ???ー???絽?綣????鐚?redis???絽?綣???????篁?箙?膽咲?件??
+ 膈?鐚?篏睡??Redis絎??ー???絽?綣???????絽娯戎???`SET key value NX PX milliseconds`??巡擦????キ?????????羌?腮?鐚?SET筝?筝??壚????種??絋?UUID鐚?篏?筝?value鐚?莅丞舟NX鐚?筝?絖???????莅丞舟鐚????PX鐚?莅丞舟菴??????狗?器??????????冗??鐚????菴?Lua?????サ?ゆ??value?????減綵????膾睡??莅丞舟?????種?????????ц??DEL???
+ 膽咲?件??
+ * **臀?膸???????**鐚??櫝?遵嚩??顔?????羈??キ???????????障??
+ * **筝私????????**鐚?絋????Redis??壚源篁???倶??鐚?筝肢????劫??莅丞舟???絨怨????削??篁??????号?????筝坂源鐚????篌?筝√け???
+ * **???菴??????狗?頑倘臀?**鐚?莅丞舟菴???上櫝?遵嚩??岩????≧??????????絨沿?????鐚?莅丞舟菴???水櫝?遵嚩??贋???????????菴?腮?經ð???????????羈??????障??
+ * **筝????????**鐚?藥?莅ゅ???ー筝???壩?????筝?膾睡??紊?罨∴キ??????筝??????????
+ * **??????羈?茴?綮狗??**鐚?絋????????????????菴?腮?紊??????狗?頑??菴?TTL鐚????篌??????????常????銀??菴?腮??櫝?処キ?????育??鐚?絲取?贋?井?勌??筝???眼??
+4. Redis ???箙??????阪?駈????????腱???劫???篌?膽榊?号?壚??箙?鐚????箙?絎??ー???鐚?RDB???AOF?????阪??
+ 膈?鐚?Redis筝肢?????筝ょ?????箙??????阪?駈??RDB鐚?Redis Database鐚????AOF鐚?Append Only File鐚????
+ * **RDB**鐚?
+ * 篌???刻???????????筝????篁駈????????紊?篁遵??菴?腱誌????√?????綺?辱鐚?絲号?ц?遵襲???莨?絨???Û??篆?絖???号?狗?糸??鐚????
+ * 膽榊?刻????井?勖??筝√け蕋???ú???????割??篆?絖???顔??鐚?鐚?篆?絖???九櫝?巡婚???fork?????吟??
+ * 絎??ー鐚????菴?`SAVE`鐚???糸??綣?????`BGSAVE`鐚???????fork絖?菴?腮?鐚???巡擦鐚?絨????絖?筝下????井?勰??綽??т??絖???亥????????`.rdb`???篁銀賢????櫆札???臀勌??絖?膈???ワ??絋?`save 900 1`茵?ず900腱???????1筝???????????茹???鐚????
+ * **AOF**鐚?
+ * 篌???刻????井?勖?翫????Ǎ??筝√け??井?勰???櫐ァ鐚?腱?膾ф????翫??鐚?鐚???壩??Append罔≦???菴遵???????ц?処??絅純??
+ * 膽榊?刻?????篁銀??腱奝??絽御??RDB紊э????√?????綺???RDB?????絲号?ц?醇??筝?絎?綵怨??鐚????荀??????ョ?????鐚????
+ * 絎??ー鐚?莅医?????????????巡擦???AOF???篁倶??絨障???櫆札???菴?`appendfsync`???臀???罩ラ?????鐚?always/everysec/no鐚??????壩??AOF??????鐚?`BGREWRITEAOF`鐚?鐚????膽?AOF???篁九ぇ絨????
+ * **??阪??**鐚?RDB???辱??э??AOF????巡擦??ュ??鐚?RDB??√??綽????櫝?巡権紊掩?井?卡??AOF絎????篏???√????≫?????篁九ぇ鐚????絽後産莅勌犬???膸????篏睡?????
+5. Redis???臂わ??蕭??櫜?Ǎ???????????
+ 膈?鐚?Redis???臂ら??菴???井???????鐚?Sharding鐚????筝私??紊???駈??Replication鐚?絎??ー蕭??櫜?????罔?????ï?????
+ * **??????**鐚?絨???岩肩??井?勰????????筝阪??筝?Ы鐚?Slot鐚????16384筝???鐚?罸鋇?????壕??茣d????????罕純??絎∽?欠????菴????絽?膊?羈?鐚?絋?CRC16鐚?莅∞??Key絲劫?????罕緒????九??莊夌?怨?域??茣h唫罕順???????鴻??罸鋇?Ы??延??筝ŭ源?????刻??Master鐚?茣?茣o??綛九櫆札???筝?筝???紊?筝ŭ???????刻??Slave鐚?菴?茵???井??????吟??綵?筝肢????号???????駈???????居??Sentinel鐚???????臂よ??昆篌??????絨?篁??????号?????筝坂源?????刻??篆?莚??????&gt;??筝中?KK??
+ * **蕭??櫜??**鐚?箴?莎?篋?筝私??紊???九????????莉スЩ??阪?吟???????究─綣??Redis Sentinel鐚???壩?ð??絽悟????号??鐚?茣?茣g???ァ????????ュ?????????????莉スЩ???Redis Cluster 3.0+ ???臀勌????????蕭??櫜???????緒???????号?????罍?羌????筝私?????????????
+6. Redis?????井?勖??羆亥?????
+ 膈?鐚?Redis???箴?篋?紊?腱???井?勖??羆亥????ワ??綵????絖?筝?莇恰?九?喝??絋?篏?羞?羆井?井?卡??
+ * **noeviction**鐚?藥?莅ょ????ワ??筝?羞?羆遺算篏???井?卡???????ュけ茣ワ??菴????OOM???莚姒?????
+ * **volatile-ttl**鐚????倘臀勌??菴??????狗?雁????勌賢鐚?羞?羆?TTL?????下????勉??
+ * **volatile-random**鐚????倘臀勌??菴??????狗?雁????勌賢鐚??????堺??羆違??
+ * **volatile-lru**鐚????倘臀勌??菴??????狗?雁????勌賢鐚?篏睡??LRU鐚????菴????絨?篏睡?Ǎ??膊?羈?羞?羆違??
+ * **volatile-lfu**鐚????倘臀勌??菴??????狗?雁????勌賢鐚?篏睡??LFU鐚????筝?膸鎵娯戎??Ǎ??膊?羈?羞?羆違??
+ * **allkeys-lru**鐚????????????勌賢鐚?篏睡??LRU膊?羈?羞?羆違??
+ * **allkeys-random**鐚????????????勌賢鐚??????堺??羆違??
+ * **allkeys-lfu**鐚????????????勌賢鐚?篏睡??LFU膊?羈?羞?羆違??
+7. 筝坂??箙?荀????redis鐚?筝坂??箙?荀??????絖?鐚??????ŭ????堺?壚戎?????絖?
+ 膈?鐚?
+ * **筝坂??箙?荀????Redis**鐚????筝?Redis??奝????ц?順?????絖???井????鐚???壩??紊?腱???井?勛?????鐚???桁?????箙??????遵??鐚???壩?????絽?/莅∫?????篋???∞??鐚?筝????讐膊????鐚?腓上?堺柑莊????絎???劫??????????荀?綽???莚糸?????膸?????????井?????????????絽?綣????膈???堺?壔??
+ * **筝坂??箙?荀??????絖?**鐚?膽?絖????篋?絖?????下?号?井?卡????鎞?絲劫??腴壩?井????鐚?絋?MySQL鐚????莅翠???????鐚????蕭?膤紫?????綺????綺???????????????劫???????隙??薨????
+ * **篏睡????堺??**鐚?篌?莚?膽?絖?鐚?Session Cache鐚??????????篆≧?夌??絖?????????隙拭??夌??絖???????茵?网????莅≧?医????????絽?綣???????羔???奝????????膽?絖???井??????ヨ哆膸????膈????
+8. redis篋???\??篋?茹e??鐚?篋?茹?Redis篋???∞??CAS???篏????
+ 膈?鐚?篋?茹c??Redis篋???♂??菴?`MULTI`???`EXEC`???`DISCARD`???`WATCH`??巡擦絎??ー???
+ * `MULTI`綣?紮?筝?筝ŭ????≦??鐚????膸上?巡擦篌??????????
+ * `EXEC`??ц??篋???≦??筝中?????????????巡擦???
+ * `DISCARD`???羔?篋???≦??鐚???上????????????????巡擦???
+ * `WATCH`???篋????茹?筝?筝???紊?筝??卡??絋???????`EXEC`??ц?????菴?篋???勤←??銀??絎∽?欠?篆勖?刻?????篋???&gt;??紊沿乾鐚?菴????腥榊?????鐚????菴?膠私室篋?CAS鐚?Compare-And-Swap鐚????篏?鐚?隋勌???????ц??篋???≧????器??茴???茹??????勖押???茴?信??刻?????箴?筝?絎???????絖???у??筝???贋?т??莚????
+9. 絋?篏?茹e?? Redis ???綛九??腴?篋?Key??勰?????
+ 膈?鐚??櫆札???菴?篁ヤ????劫?頵e?鰹??
+ * **???絽?綣????**鐚?篏睡??Redis???SET NX PX??巡擦?キ??????鐚?隋勌?????筝???狗?翫Ŭ??筝?筝?鎖腮???醇??篏?莚?Key鐚????篏?絎????????????冗?????
+ * **羔???奝?????/篁糸?♂?????**鐚?絨????荀?腴?篋?Key??????篏???上?ラ?????鐚???掩??茣壕??蕁阪?鎀????鐚???水??綛九?????
+ * **篏睡??Redis篋???\??WATCH鐚?**鐚????茹?Key鐚?絋????Key???篋???≧?ц?????茴?信??刻????????莚??????上?????
+ * **?????サ垽ァ???**鐚????Key?????寂賢??????????サ埦????贋?井?倶????ョ????サ垽?????拷?????
 10. Redis筝坂??箙??????膾睡?????鐚?筝坂??箙????膾睡??菴?菴?箙?綽???
+ 膈?鐚?
+ * **筝坂??箙??????膾睡??**鐚?Redis???臀?膸?I/O???????惹??篏?鐚???後????肢??鐚?筝肢????延??筝?鎖腮?紊????鐚?筝肢????壚減篋?膊????綣?????????鎞?紊?膾睡??腴?篋?鐚????鐚?絽??ョ????ц?醇?????鐚?篁ュ??篆?莚???巡擦??????絖???с????順?九??膸下????サ????ヤ??紊?膾睡?????篋????????????倶??篏?鐚?絋?RDB/AOF??????鐚?鐚?篏???後??篋?篁九妾?ッ?????巡擦紊????篁??????膾睡?????
+ * **筝坂??箙?綽?**鐚?
+ * **膾???絖????篏?**鐚???井?????????????絖?筝昭和??莚糸?????綺???綽???
+ * **蕭?????????井?勛?????**鐚????絲剛???????堺?壚?????篋???井?勛?????鐚?絋????絽?茵????莊活??茵??????贋?育?????膈?鐚????
+ * **I/O紊?莊??????**鐚?篏睡??epoll鐚?Linux鐚????kqueue鐚?BSD/macOS鐚?膈???阪?駈?????膾睡???櫆札蕭????紊????紊ч?鎶九??菴??・???臀?膸?I/O???
+ * **?????糸??I/O**鐚?臀?膸?I/O?????罩ョ??鐚?筝?篌???糸??筝紫鎖腮?紊??????銀????巡擦???
 11. 絋?篏?篆?莚?膽?絖?筝???井????????????句????井?勌????贋???
+ 膈?鐚?菴???壚??筝???????????勰??鐚?羃≧??膸?絲劫??臂??????号??鐚????絽檎?????篁ヤ??膈???ョ?????鐚?
+ * **?????贋?井?井????鐚??????贋?亥??絖?**鐚?菴????幻茹????羈????篏?絋????膽?絖???贋?医け茣ワ??篌?絲取?岩??筝???眼???櫆札???菴????莚???阪?区В??潟??
+ * **????????ょ??絖?鐚??????贋?井?井????**鐚???????篋?莚糸?????絨???堺?壔????贋?井?井???????腴???喝????ょ??絖?鐚?筝?罨∴嚞莚傑??篌??サ??井???????莉醇?井?井??攻???紂???絖????篏?絖???????吨??筝?筝???顔?勰??鐚???ф?井??櫝?遵????絖?筝昭和?????
+ * **綮倶?九?????**鐚?????????ょ??絖?鐚??????贋?井?井????鐚???九??綮倶?銀??罧究?狗?器??絋?1腱?鐚?????????や??罨∞??絖?鐚?隋勌????????吨????????莉遵?井?ф?井?勛??莚傑??茴?????ŝ??
+ * **??井????茹??????**鐚??????井??????贋?井?区Е???筝?筝???篏??サ??贋??/?????ょ??絖?鐚?篏??????綺???鐚?筝????膸贋?ゃ??
+ * **羔???奝?????鐚?MQ鐚?**鐚???井??????贋?医????????羔??????MQ鐚?羔?茣壕????????MQ綛倶?贋??/?????ょ??絖?????櫆札絎??ー???膸?筝???贋?э??篏?綣???ヤ????亥??紊????綺???
+ * **筝???♂?肢???ァ???**鐚????筝???≦????≫??莚?鐚?絋????筝?筝ŭ????&gt;賢絎??????井??????贋?医??膽?絖???贋??/?????ゃ??
 12. redis???memcached???篁?箙???阪??
+ 膈?鐚?
+ * **??井?勛瓜???**鐚?Redis??壩??紊?腱???井?勛?????鐚?String, Hash, List, Set, Sorted Set膈?鐚?鐚?Memcached?Ŭ?壩??膊???????Key-Value絖?膃?顕???
+ * **???箙????**鐚?Redis??壩??RDB???AOF???箙????鐚?Memcached藥?莅や?????箙????鐚???ら??篏睡???筝???号??篁駈?????
+ * **???絖?膊∞??**鐚?Redis篏睡????翫???????????絖?膊∞????劫???絋?ziplist???intset膈????膽ñ?????鐚?鐚?Memcached篏睡????????????????絖?羆????
+ * **???絽?綣?**鐚?Redis??????臀勛?????臂ゆ?壩??鐚?Redis Cluster鐚?鐚?Memcached???荀?絎∽?欠????篁g??鐚?絋?Twemproxy鐚?絎??ー???絽?綣????
+ * **???膾睡?? vs 紊?膾睡??**鐚?Redis??後???????膾睡??鐚?篏?臀?膸?I/O?????膾睡?????鐚?鐚?Memcached?????膾睡????????
+ * **?????巡鍵絲?綺?**鐚?Redis?????醇?岩鍵絲?鐚???壩??篋???&lt;?????絽?/莅∫?????Lua?????ス??鐚?Memcached??後噲膊???????
 13. JVM??サ?亥??絖?鐚?篋?茹h?????
+ 膈?鐚?篋?茹c??JVM??サ?亥??絖???壩????贋・???Java綺??????綺????JVM???絖?筝上???????井?勛??膽?絖?鐚?筝?箴?莎?紊?????????&lt;??絽梧?????絎??ー???鐚?
+ * **Caffeine**鐚?蕭???ц?順??Java膽?絖?綺?鐚???坂??腦????LRU/W-TinyLFU膊?羈?鐚???夌?????ィ???篏睡???????
+ * **Guava Cache**鐚?Google Guava綺????箴????膽?絖?絎??ー鐚??????順┳絎?鐚?篏睡??綛炊?????
+ * **Ehcache**鐚??????遵失紊х??膽?絖?罅???駈????壩????サ?亥??絖???????絽?綣靶?絖????
+ * **ConcurrentHashMap**鐚????膊???????絎??ー鐚?篏????荀???????紊????菴???????羞?羆亥????肢?????
+ 絎?篁ソ??絽御??箴?????????莉純??菴????膈???ャ??紊у???????吟??綛九???ァ??句???????純??
 14. redis???list膸??????後?括?????篏????
+ 膈?鐚?Redis???List鐚????茵Ǎ??????坂??????????乗;鐚???????膽ï??茵Ǎ??絎??ー???鐚?筝肢?????篏??????ロ??
+ * **LPUSH / RPUSH**鐚???????茵?紊顔??/絨冗??羞糸??筝?筝???紊?筝???膣????
+ * **LPOP / RPOP**鐚?腱脂?ゅ攻菴???????茵?紊顔??/絨冗????膃コ??筝???膣?鐚?罔≧?????/??????鐚????
+ * **LRANGE**鐚??キ??????茵????絎??????翫????????膣????
+ * **LLEN**鐚??キ??????茵??水墾???
+ * **LINDEX**鐚??キ??????茵????絎?膣√??篏?臀勛?????膣????
+ * **LREM**鐚?腱脂?ゅ??茵?筝中??絎???育?????膈?篋????筝??主?????膣????
+ * **LSET**鐚?莅丞舟???茵????絎?膣√??篏?臀勛?????膣???若??
+ * **LTRIM**鐚?篆?????茵Ǎ???Ü????????絎??????翫????????膣????
+ * **BLPOP / BRPOP**鐚???糸??綣鏁劫?削??綵????茵?筝榊Ã??狗?糸??鐚???翫?井?????膣??櫔執??堺??莇???駈??絽悟??篋?絎??ー??糸????????鐚????
+ * **RPOPLPUSH / BRPOPLPUSH**鐚????絖???у?遺??羣????茵?綣劫?阪鮎??????膣?綛倶ィ??ョ?勖?????茵?紊顔?Ǎ??絽悟??篋?絎??ー綏ヤ??腦????鐚????
 15. redis2???redis3?????阪????redis3????????莅壩?阪?吟??
+ 膈?鐚?
+ * **Redis 2 vs Redis 3**鐚?
+ * Redis 3.0綣???ヤ??Redis Cluster鐚?絎??ー篋????臀勛??????????????????????莉スЩ鐚?菴???壩????後???????阪????
+ * Redis 3.0絲号?ц?遵??腮喝????ц??茵?篋?篌???????
+ * 綣???ヤ??`CONFIG REWRITE`??巡擦鐚?篌???????臀勖??篁句???????????
+ * 紜????篋?筝?篋???医?巡擦????????純??
+ * **Redis 3????????莅壩?阪?駈?????臂わ??**鐚?
+ ???臂よ????剛????顔??菴?TCP???篆\??篏睡??筝?腱?腱遺減???Gossip????????顒勖?ヤ困??≫拭??姒??筝肢???????ロ??
+ * **?????劫???ー**鐚???域????拷??菴? handshake ??阪?九????ラ??臂わ??綛銀????銀???????壕キ??????臂ゆ?????篆≧?壔??
+ * **??倶?????罩?**鐚??????劫??????????銀???????劫?????ping羔???姒??????????訓?????倶?????筝?篋??????肴????剛拭??姒???・??倶?劫??紊?pong??????菴?菴?腱???劫?鋍???左????合????倶??鐚????鎖???筝?膾帥?????篌寂??膾睡??鐚????
+ * **??????罍?羌?**鐚?絋?????????号押?????九?井??筝?????合??pong???綺?鐚?篌????莅遺減???篌寂??膾随??PFAIL鐚?鐚???九?????菴?Gossip羔???壚????昭和??綵?紊???遺源?????拷?処丨筝堺??筝ŭ源?????合??篌寂??膾炊?駈??篌????莅遺減筝?膾随??FAIL鐚?鐚?綛九??紮???????莉スЩ羌?腮????
+ * **羔???夌瓜???**鐚???????meet鐚??偪??鐚????ping???pong???fail鐚????????????ワ?????ping-ack膈????
 16. Redis??????筝丞??羈????羌?腮???壩????欠??鐚?
+ 膈?鐚?Redis??????筝常??筝肢????拷??筝常???????????筝肢????号?????鐚???銀???????拷??荀???????筝坂源?????号?吟?????筝丈??腮?筝肢????怨????居??Sentinel鐚????Redis Cluster???昆?ァ??駈??
+ * **????ー??????**鐚??????究?????臂よ????号??羌???遺源?????号????????
+ * **???莎潔??筝?**鐚???????筝肢????合??篁??????剛?????筝????筝障??
+ * **???筝丈?&gt;散**鐚????絽檎????î?????膾ф??蕭??????井?勖????逸??紊???九?霡脂?????紊э?????runid???絨????篁??????鴻??
+ * **???腑?**鐚?????????究─綣鋇?鐚???沿松??井??絎?腑???亥???????究??腑???喝????亥??筝肢????鴻?????Redis Cluster筝昭和????演??臂ゅ??紊???遺源?????号??腑???喝?????
+ * **??????筝肢?????**鐚??キ緇?莇喝??腑???亥??篁??????壕←??????筝坂源?????刻??綛狗????ュ?銀??篁??????号?贋?育??臀勉??
+ * **?????ュ???欠?**鐚???亥??筝肢????劫????????/???臂や???????ュ???欠???贋?域???・??医?????
 17. Reids???筝私??紊???倶?阪?九????????
+ 膈?鐚?Redis筝私??紊???駈??Replication鐚???????鐚?
+ 1. **綮榊??菴??・**鐚?篁??????劫??筝肢????劫?????`SYNC`??巡擦鐚??????х??鐚????`PSYNC`??巡擦鐚??????亥??鐚???壩??????????????罩ワ?????
+ 2. **????????罩?**鐚?筝肢????号?九??`SYNC`???`PSYNC`鐚??????霡脂??????鐚???ц??篁ヤ??罩ラĽ鐚?
+ * ??ц??`BGSAVE`??????RDB綽??ф??篁吟??
+ * 絨???????膽?絖?????????巡擦鐚?AOF膽???峨?削????????膸?篁??????鴻??
+ * RDB???篁句????????鐚????菴?臀?膸???????膸?篁??????鴻??
+ * 篁??????号・???RDB???篁九攻???莉遵?医??絖?鐚???九???・??九攻??ц??膽?絖?????????巡擦???
+ 3. **?????????罩?**鐚?`PSYNC`??壩??鐚?鐚?絋????篁??????壕?醇??箴??????????紊???九?霡脂?????run id鐚?筝肢????剛??罍???ヨ??訓???膽???峨?削??絋????絖????絲劫????霡脂???????巡擦鐚?????Û?????菴???????紜??????井?勛??篁??????刻????水??????????罩ャ??
+ 4. **??巡擦篌????**鐚??????/?????????罩ュ????????鐚?筝肢????剛??絨????膸上???????????????????巡擦絎???九??罩ュ?医?????膸?篁??????刻??篆?莚???井?勌????贋?с??
+ 5. **篁??????壕?????**鐚?篁??????拷??莅や??絲劫???????\???Ű嚞????櫆札???菴????臀勤份??九櫔??鐚?篏???井?勖??膸?篁ヤ源?????剛減??????
 18. Redis???膾睡??罔≦????壚??箙?鐚?
+ 膈?鐚?Redis?????後??膾睡??罔≦?????**???膾睡??篋?篁九妾?ッ罔≦??**???筝紫鎖腮?茣?茣o??
+ * **篋?篁九妾?ッ**鐚?篏睡??I/O紊?莊????????阪?駈??絋?epoll鐚??????サ??筝?socket???篋?篁駈??菴??・????櫝嚞????櫔??鐚????
+ * **??巡擦紊????**鐚?綵?socket?櫝嚞??駈??筝紫鎖腮?莚糸??絎∽?欠?莚傑??鐚?茹f????巡擦鐚?綛九?????絖?筝中?ц????巡擦鐚?絋???贋?育???種?????
+ * **臀?膸???????**鐚?綵?socket?櫔????駈??筝紫鎖腮?絨???巡擦??ц??膸??????????socket??????膸?絎∽?欠????
+ ??順?倶?後???????膾睡??鐚?篏?Redis 4.0+ 綣???ヤ??紊?膾睡????ュ?????筝?篋??????句??????伻算??\??絋?`BGREWRITEAOF`???`BGSAVE`鐚?篁ュ?颰私源膾睡??茣????鐚????蕭???ц?純??
 19. Redis???篏睡????羈???鋌?箙?鐚?莅画佪???箙??????劫??????絖?莅丞舟鐚????臂ょ??綺???????篌???e?随??羞?羆亥????ョ?????
+ 膈?鐚?
+ * **羈???鋋?蕁?**鐚?
+ * ??????莅丞舟Key???菴??????狗?器????水?????絖???????紜???帥??
+ * ??水??篏睡??`KEYS *`膈???巡擦??糸???????\??篏睡??`SCAN`篁f?帥??
+ * 紊?Key??????Key??勰??荀???恰絵鐚???水??綵怨????ц?純??
+ * 罩g`???臀勖??箙????鐚?綛活 ??井?????????у????ц?純??
+ * ????ァRedis絎?箴???倶??鐚????絖????CPU???菴??・??違??綮区??膈?鐚????
+ * **???箙??????劫??**鐚?茹???勰??4???RDB??????紊?篁緒??AOF????????井?????????????絽娯犬???膸???????
+ * **???絖?莅丞舟**鐚????菴?`maxmemory`莅丞舟???紊т戎??????絖?鐚????菴?`maxmemory-policy`莅丞舟羞?羆亥????ャ????号?????????堺?奝????ï???????????篏?鐚?MB???GB膈?鐚????
+ * **???臂ゅ?????**鐚?
+ * **綺????**鐚?茹e?喝????阪??絖???狗??鐚?絎??ー蕭??櫜?????罔?????ï?????
+ * **篌????**鐚???壩????翫ぇ茹?罔≧?井?卡??蕭??櫜????э?????????????莉スЩ鐚?鐚?莚糸????ц?遵櫐?ï??鐚???????鐚????
+ * **??e??**鐚?絎∽?欠?絎??ー紊????鐚????荀?紊????罕遵???????????絎????膈?鐚?鐚?筝???壩??莊?????剛????\?????篋???巡擦鐚?絋?`KEYS`鐚??????臂や賢????????????荀???号??紊????鐚?菴?膸雁?後噲紊???????
+ * **羞?羆亥?????**鐚?茹???勰??6?????号?勖?井?勤倧??勖─綣???????荀???ч????ú??絋?莚糸?????絨????`allkeys-lru`鐚???????隋??欠?中?井???阪?????`volatile-lru`???
 20. Redis膽?絖???????
+ 膈?鐚?Redis膽?絖???????鐚?Sharding鐚???壩??絨?膽?絖???井??????e???????医??筝?Redis絎?箴?筝昭和????勛????夌????翫????阪??絖??????駈?????蕭?膽?絖?絎拷?????綛九??紊??????遵?????絽梧???????????膈???ユ??鐚?
+ * **絎∽?欠???????**鐚????絎∽?欠?篁g??筝上???ー????????肢??鐚?絋?篏睡??筝???贋?у??絽?鐚?Consistent Hashing鐚?絨?Key???絨???亥?劫??絎?箴????篌???号?夌???????贋・鐚?膽榊?号?????欠?篁g??紊????鐚???ï????у勲???
+ * **篁g????????**鐚?篏睡??筝?筝ŭ賢??岩撮???絮?鐚?絋?Twemproxy???Codis鐚??・??倶?????莚傑??鐚?篁g????号???????茹????絨?莚傑??莉サ????井3隋勛??Redis絎?箴????篌???号?????欠???????鐚?膽榊?号??????ヤ???????号??????????ц?順?狗?????
+ * **?????∞???????**鐚?Redis Cluster絨掩???後??????????∞???????鐚?絨???井???????筝?16384筝?Ы鐚?罸鋇?????壕??茣d????????罕純??絎∽?欠?鐚?絋?Lettuce???Jedis??????臂ゆ─綣?????荀???ラ??罕順?????絽?鐚?????????掩????∞?鐚?MOVED/ASK???絎????鐚??????ャ??菴???夌????筝紙???????号?????
 21. redis??????臂ゆ??箙????罩ョ????井?勛??鐚?
+ 膈?鐚?Redis???臂ょ????井????罩ユ?奝??菴?**筝私??紊???駈??Replication鐚?**??阪?九???ー?????????臂や賢???罸鋇??井???????鐚?Slot鐚???延??筝ŭ源?????刻??Master鐚?茣?茣o??綛九櫆札???臀勌??筝???紊?筝ŭ???????刻??Slave鐚????筝肢????劫????井?勛???????器???????巡擦鐚????菴???巡擦篌???下????劫?鎘???九??罩ュ?医?????膸???倶????????篁??????刻??篁??????号・??九攻??ц??菴?篋???巡擦鐚?篁????篆????筝?筝肢????合????井?勌????眼??綵?筝肢????号???????駈????銀???????剛??茴???????筝坂源?????刻??綛狗??菴?紊???倶?阪?銀????銀??筝肢????刻???????銀???????刻?????罩ユ?井?卡?????膸?莨上?井?井?勌????眼??
 22. 莚傑?????筝?筝??号??鐚?莅乗?&gt;??筝?櫆札?ァ??句??絖???私??紊у????????????綺??????サ?亥??絖????
+ 膈?鐚??櫆札莅乗?&gt;??筝??坂??`Caffeine`???`Guava Cache`?????サ?亥??絖?鐚?綛倶兄????????綺??ァ??狗?肢??鐚?
+ * **??榊??膽?絖?**鐚?篏睡??Caffeine鐚?莅丞舟筝?筝???紮???????紊уぇ絨??絋?`maximumSize`鐚????
+ * **????ァ??阪??**鐚?絎????鐚?絋?罸???????鐚?罍???ュ?????膽?絖????絎????紊у??????膣???育?????篌亥?????絖??????Ǎ?????
+ * **?????綺?莪????**鐚?
+ * **??ï俉**鐚?絋????膽?絖?紊у???・菴?筝????鐚?篏???巡賢???篁???九??蕭?鐚??櫆札???綵?紜????`maximumSize`鐚?絋?紜????10%鐚????
+ * **膽ï俉**鐚?絋????膽?絖?紊у???・菴?筝????鐚?筝???巡賢???筝????鐚??櫆札??鎞?`maximumSize`鐚?絋???鎞?10%鐚??????????鐚?絋????膤紫????岩?????絖?膣у??鐚??櫆札綣阪?九?鎞?`maximumSize`???
+ * **羞?羆亥?????**鐚?紮?膸???夌??????????羞?羆亥????ワ??絋?`evictionPolicy`莅丞舟筝?LRU???LFU鐚????
+ * **???莉順?????**鐚?絲剛??蘂?膵?莅翠?勌???????絖??????井?卡??絎??ー????????莉初?肢?????
+ * **絎??ー**鐚??櫆札???菴???ï??Caffeine???`Cache`???`LoadingCache`鐚???????絨?茖?筝?絮?鐚????put/get???篏????絎????篁糸?&gt;賢絎??ー筝?菴育?肢?????
 23. redis????????究─綣??筝?筝?key??弱??篏????redis???臂や賢??上?医????????????????
+ 膈?鐚?
+ * **?????究─綣?**鐚??????居??Sentinel鐚???セ昆筝???贋・???箴???井????????????純??絎?筝肢??茣?茣g???ァRedis筝私???????合????ュ嵯??倶??鐚????筝肢????号???????区??????茵???????莉スЩ鐚?Failover鐚?鐚????筝丈?亥??筝肢????刻??綛狗????ュ???欠???贋?域???・篆≧?壔??絎∽?欠????荀????訓絎??ー??????箴?莎?絎∽?欠?綺???ュ???ー菴??・??肢?????
+ * **????????究─綣鋇????Key篏?臀?**鐚?絎∽?欠????絽梧???・??医????球??箴?鐚??????灸??菴????綵?????櫜????筝肢????劫?医?????絎∽?欠?菴??・??遺源?????劫??鐚?絋????綺????篋?Redis Cluster???????????肢??鐚?絋?筝???贋?у??絽?鐚?鐚?絎∽?欠?篌???号??Key莅∞??綺?莚ュサ??ŭ肩?????刻??????????究─綣鋇?鐚????絽後葦??壚源?????刻????ら??Key???篁??????剛??鐚????絋????羃≧??????????肢??鐚?絎∽?欠?藥?莅よ???・???筝肢????劫葦??虁倧??勛???????刻??膊????筝私??鐚???????????????????莚脂?遵??筝肢????刻?????
 24. Redis鐚?筝?筝???膃?顕膠糸???????取?遵????????紊у俉????????絨?鐚?
+ 膈?鐚?Redis絖?膃?顕膠糸???????惹??紊у櫆札絖???? **512MB** ?????井?勉??
 25. MySQL??????2000w??井?卡??redis筝上Û??20w?????井?卡??絋?篏?篆?莚?redis筝下????井?勰?醇?夌?下?号?井?卡??
+ 膈?鐚??櫆札???菴?篁ヤ?????腱?膈???ョ?????篆?莚?Redis筝上?????????夌?下?号?井?卡??
+ * **??坂??莅翠?勰?????**鐚?莅医??罸鋇?Key???莅翠?勖???逸??絎????鐚?絋?罸鎞???駈??絨?莅翠?勖???井??蕭????N筝?Key鐚?菴???????20w筝??????莉遵??Redis筝KK??
+ * **??坂??LRU/LFU膊?羈?**鐚????Redis筝左倘臀?`allkeys-lru`???`allkeys-lfu`羞?羆亥????ワ??綛区倘臀?`maxmemory`筝咲??綵?紊у?????菴???件??綵??????井?井?勰??荀?膽?絖???駈??篌??????羞?羆井?????菴????絨?篏睡????????筝?蘂?膵?篏睡??????ф?井?卡??隋勌??膽?絖?筝上??膸???壩??菴????絽梧倧??勛????下?号?井?勉??
+ * **??阪??絖???蘂?羌?**鐚???ñ??????兓倧??勖?井?勤你膸?罔≦??鐚?蘂?羌?????ョ????下?号?井?卡???????????莉遵??Redis???
+ * **膸????膈????**鐚?箴?絋?鐚?膸????LRU???莅翠?勰?????鐚?篌????膽?絖?莅翠?勰?????蕭?筝?菴????茴?倧??勤???????井?勉??
 26. Redis???Redisson???篁?箙???括鎧鐚?
+ 膈?鐚?Redis ??壚??筝???羣??????????絖?筝下????井?勛?????絖????鎧膸?鐚??櫆札???篏???井???????膽?絖????羔???壚賢??岩散???絎???セ昆???箴?篋?筝?絅???巡擦茵??・????CLI鐚????膊???????絎∽?欠?綺?鐚?絋? Jedis???Lettuce 膈?鐚?箴?綣???????篏睡?????
+ Redisson ??? Redis ???筝?筝? Java 絎∽?欠?絎??ー鐚?篏?絎?筝?篁?篁???壚??筝?????????絎∽?欠????絎???夌?? Redis Labs 綣???????鐚????箴?篋???顔??膾х????処院????????純??Redisson 絨?茖?篋? Redis ???綺?絮????篏?鐚????箴?篋?筝?絅?筝医??筝????篋?篏睡???? Java API鐚???壩??紊?腱? Redis ??井?勛?????鐚?綛九??臀勌??莅後??蕭?膾у????緒??箴?絋?鐚?
+ - ???絽?綣????鐚?RedissonLock鐚?
+ - 莚糸?????鐚?RedissonReadWriteLock鐚?
+ - 篆≦埌???RedissonSemaphore鐚?
+ - ?櫝????????鐚?RedissonRedLock鐚?
+ - ???絽?綣???????鐚?絋????絽?綣? Set???Map???List 膈?鐚?
+ - ???絽?綣鎛壕院鐚?絋????絽?綣? Queue???Stack 膈?鐚?
+ - ??壩??紊?腱?綺?????????劫??
+ - ???箴?篋?綣?罩ュ?????綺?綣??Reactive鐚?API
+ 膊??????ヨ?鐚?Redis ?????絮???井????????????\????? Redisson ??壚??筝?????遵失紊х?? Java 絎∽?欠?綺?鐚?膊????篋?筝? Redis ???篋や??鐚?綛倶??箴?篋?莅後??綣?膊怨?括???????絽?綣頵e?恰?号?????
 27. Redis筝下??膊♂?????篁?箙???Ǎ??
+ 膈?鐚?Redis 膊♂??鐚?Pipeline鐚???壚??腱?絎∽?欠??????姒?????莅後???欠?絨?紊?筝? Redis ??巡擦筝?罨≧?у?????膸??????≦?Ǎ?????筝????荀?膈?緇?罸鋇??巡擦??????綺?????????≦??篌?蕁阪?鎀????菴?篋???巡擦鐚?綛九???????????綺???????菴????膸?絎∽?欠????
+ 膊♂?????筝肢??篏??????姒??
+ - **???蕭???ц??**鐚???鎞?篋?絎∽?欠?????????≦??箙???雁??臀?膸?緇?菴?罨≧?逸??Round-Trip Time, RTT鐚????絲剛?????荀???ц??紊ч?颷?膸上?巡擦?????堺?姒???櫆札??乗????????????????????
+ - **??拷?鎀????**鐚?絨?紊?筝???篏????膸????筝?莎傑?ц??鐚???肢??筝???贋????違??
+ 箴?絋?鐚??????ソ??荀? 10 罨∞??膸?緇?菴???? 10 筝??巡擦鐚?篏睡???♂??????櫝?遵Ū??荀? 1 罨∞??膸?緇?菴?鐚???????????????巡擦鐚???? 1 罨∞??膸?緇?菴?鐚??・??倶????????綺?鐚?鐚?紊уぇ??鎞?篋?臀?膸?綣???????
 28. Redis篋???∞?後?括????巡擦????????筝???
+ 膈?鐚?Redis ???篋???&gt;源荀????菴?篁ヤ????巡擦絎??ー鐚?
+ - `MULTI`鐚????莅遺??筝ŭ????≦?????綣?紮??????? `MULTI` ??巡擦箙???????????????巡擦筝?篌?腴???恰?ц??鐚??????虁←??上?ヤ??筝??????筝KK??
+ - `EXEC`鐚???ц?? `MULTI` ??巡擦箙??????????筝中??????????巡擦???絋????篋???≧?ц????????鐚?????????巡擦??巡?????蕁阪????ц??鐚?絋????篋???≧?ц??紊沿乾鐚?箴?絋????筝??巡擦莚中?????莚姒??鐚??????岩肩篋???≦??篌?茴????羔?鐚?discard鐚????
+ - `DISCARD`鐚????羔?綵????罩e????ц?????篋???\??羝?腥坂????♂????????
+ - `WATCH`鐚????茹?筝?筝???紊?筝? key???絋??????? `EXEC` ??ц??箙????鐚?茴???茹???? key 茴???銀??絎∽?欠?篆勖?剛??鐚???d??綵????篋???&gt;??篁ュけ茣ュ??膸?鐚?菴????腥阪?種?????絽悟??篋?絎??ー箙?茹???????
+ - `UNWATCH`鐚????羔?絲号????? key ??????茹????
 29. Redis key???菴??????狗?翫??羂娯?????????????????箙?莅丞舟鐚?
+ 膈?鐚?
+ - 莅丞舟 key ???菴??????狗?器??
+ - `EXPIRE key seconds`鐚?筝堺??絎???? key 莅丞舟???絖???狗?器??TTL鐚?鐚????篏???夌?????箴?絋? `EXPIRE mykey 10` 茵?ず mykey 10 腱????菴???????
+ - `PEXPIRE key milliseconds`鐚????筝?鐚?篏????篏???壩喎腱????
+ - `EXPIREAT key timestamp`鐚?筝? key 莅丞舟菴??????狗?贋?鰹??Unix ??狗?贋?鰹?????篏???夌??鐚????箴?絋? `EXPIREAT mykey 1712345678` 茵?ず??????絎???狗?贋?喝噲綺??????九?肢????????
+ - `PEXPIREAT key milliseconds-timestamp`鐚????筝?鐚?篏???狗?贋?喝??篏???壩喎腱????
+ - `SET key value EX seconds` (Redis 2.6+) ??? `SET key value PX milliseconds`鐚????倘臀? key ??主???????駈????贋・???絎?菴??????狗?眼??箴?絋? `SET mykey "hello" EX 10`???
+ - 莅丞舟 key 羂娯????????鐚?
+ - `PERSIST key`鐚?腱脂?ゆ??絎? key ???菴??????狗?器??篏水?倶宛箙??????????
+ - ??? `SET` ??巡擦筝TEL??篏睡?? `EX` ??? `PX` ???蕁刻????贋・ `SET key value` ??喝櫝倘臀勌??筝?宛筝?菴??????? key???
 30. Redis?????銀戎???????壚??箙?膊?羈?鐚?
+ 膈?鐚?Redis ???絖??????銀源荀?箴?莎?篋?絎???? **羞?羆亥????ワ??Eviction Policy鐚?**鐚????筝???壚??膸???鋈?筝?????????上????駈??GC鐚????綵? Redis 絎?箴???????絖?篏睡??松??? `maxmemory` ?????倶?駈??篌???号?勰??臀勛??羞?羆亥????ユ?ュ?喝???????ゅ?ŭ?? key 篁ラ????上??絖????絽梧?????羞?羆亥????ュ????ロ??
+ - `noeviction`鐚?藥?莅わ??鐚?筝?羞?羆遺算篏? key鐚?綵????絖?筝?莇恰?駈??絲剛????????篏?鐚?絋? SET鐚???贋・菴???????莚姒????や?? SAVE ??巡擦鐚????
+ - `volatile-ttl`鐚????倘臀勌??菴??????狗?雁?? key 筝昭和??篌????羞?羆育?d?? TTL鐚?Time To Live鐚???惹??絨???? key鐚???恰??綽???菴???????鐚????
+ - `volatile-random`鐚????倘臀勌??菴??????狗?雁?? key 筝昭和???????堺??羆遺???????? key???
+ - `volatile-lru`鐚????倘臀勌??菴??????狗?雁?? key 筝昭和??篏睡?? LRU鐚?Least Recently Used鐚????菴????絨?篏睡?Ǎ??膊?羈?羞?羆井??菴????絨?茴?倧??勛?? key???
+ - `volatile-lfu`鐚????倘臀勌??菴??????狗?雁?? key 筝昭和??篏睡?? LFU鐚?Least Frequently Used鐚????菴????筝?絽悟?Ǎ??膊?羈?羞?羆域倧??勰????????篏???? key???
+ - `allkeys-lru`鐚????????????? key 筝昭和?????莅堺????倘臀勌??菴??????狗?器??鐚?篏睡?? LRU 膊?羈?羞?羆? key???
+ - `allkeys-random`鐚????????????? key 筝昭和???????堺??羆遺???????? key???
+ - `allkeys-lfu`鐚????????????? key 筝昭和??篏睡?? LFU 膊?羈?羞?羆? key???
+ Redis 菴?篌?絎????羝????綏牙?颷????篏?絨????←?????ょ?? key鐚????菴? `expireIfNeeded` ??醇?医??倧??? key ?????ц?? `SAVE`/`BGSAVE` ??倶????ワ?????
 31. 筝?筝?Redis絎?箴????紊???遵????上??絨????keys鐚?List???Set???Sorted Set篁?篁シ??紊???遵????上??絨????膣?鐚?
+ 膈?鐚?
+ - 筝?筝? Redis 絎?箴????莅坂?????紊??櫆札絖????墾 **2^32 筝? key**鐚???喝ぇ膾? 42 篋推肩 key鐚????菴???????篋? Redis ?????????絽?茵???紊у?????膤紫?????絖????絎????筝?鐚???遵?????紊?絨? key 筝肢???????割???????≦???????絖?紊у????????臀勉??
+ - 絲剛?? `List`鐚????茵Ǎ?????`Set`鐚???????鐚????`Sorted Set`鐚????綺???????鐚?菴?篋???井?勛?????鐚?
+ - ???莅坂??鐚?絎?篁ス?????膣???育?鋈??櫆札莨上?育??絽後ぇ?????種??筝肢????????篋??櫜?????絖????
+ - `List`鐚???坂??????????乗;??????膽ï??茵Ǎ??ziplist鐚?絎??ー鐚????膣???育???櫆札莨上?井?遺鎖?????恰?翫??鐚???隙???????割?????絖????
+ - `Set`鐚???坂?????絽?茵??????贋?育?????鐚?intset鐚?絎??ー鐚????膣???育???????桁櫆札莨上?井?遺鎖???
+ - `Sorted Set`鐚???坂?????膽ï??茵Ǎ??ziplist鐚????莊活??茵Ǎ??skiplist鐚?絎??ー鐚????膣???育?鋈??櫆札莨上?井?遺鎖???
+ 絎??????遵?????紊?絨????膣?鐚??????欠?掩????≦???????絖???脂????? Redis ??????絖?羞?羆亥????ュ?喝?????綵????絖?筝?莇恰?駈??篌???号?勖??羆亥????ュ????ら????????膣???? key???
 32. Redis???莊活??茵Ǎ??紊????綺?????絨?鐚?
+ 膈?鐚?Redis 筝下??莊活??茵Ǎ??Skip List鐚???壚??腱?絎??ー???綺???????鐚?Sorted Set鐚??????井?勛????????絎????綛喝????狗?翫?????綺?減鐚?
+ - **??ユ?常??Find/Search鐚?**鐚?O(log n)
+ - **?????ワ??Insert鐚?**鐚?O(log n)
+ - **?????わ??Delete鐚?**鐚?O(log n)
+ ??銀賢 n ??虁軍莊?茵?筝下?????膣???育????????????????灸????狗?翫?????綺?減 O(n)鐚?篏?菴?腱??????球????????网???????篏?鐚????筝肴軍莊?茵???菴??????榊?????膣√??絮???ヤ??莚?綛喝????ц?純??腥咲?翫?????綺?ぇ膾??? O(n log n)鐚????筝堺?鋇?????拷?や??絖??????井????鐚?菴????荀?絖??????????筝????絮?膾х???????????
 33. Redis?????ŭ??篌?膽榊?刻??筝坂??箙?荀???? Redis 鐚?
+ 膈?鐚?
+ **篌????**鐚?
+ - **蕭???ц??**鐚???坂?????絖????篏?鐚?莚糸?????綺???綽??????絽後??緇勛??膾у???????
+ - **??井?勛?????筝医??**鐚???壩??絖?膃?顕??????絽???????茵????????????????綺???????膈?紊?腱???井?勛?????鐚?羯∴恭筝??????堺?奝??羆????
+ - **???箙????**鐚???壩?? RDB鐚?綽??э????? AOF鐚?菴遵????ュ??鐚?筝ょ?????箙??????劫????櫆札????????????√????井?勉??
+ - **???絖???ф??篏?**鐚???壩??絲劫??筝???篏?菴?茵????絖???у?????鐚????菴?篋???≧????号????巡擦絋? INCR鐚????
+ - **???絽?/莅∫??**鐚????臀勖???????絽?莅∫???????純??
+ - **??究柑?????井?勤?????**鐚???壩??莅丞舟 key ???菴??????狗?眼??
+ - **筝私??紊????**鐚???壩????井????篁遵??莚糸?????胼祉??
+ - **???臂ゆ?壩??**鐚???壩?????絽?綣????讐鐚?茹e?喝????阪??絖???狗?????
+ **膽榊??**鐚?
+ - **???絖?絖????**鐚???井????????????絖?筝昭和?????絖??????セ??蕭?鐚?筝???????絖????羌潔????井?勉??
+ - **???箙?????櫝?巡権紊掩?井??**鐚???割戎??? AOF鐚???????腴壩????灸??鐚?絋???下?灸?? AOF ????欠??鐚?篁??櫝?巡権紊怨???????井?勉??RDB ????櫝?巡権紊延??罨≦辱??у?医刊羣?箙???雁????井?勉??
+ - **???絖???????**鐚???????篋???ñ?????絖?紊у?????
+ - **紊???????**鐚?絲剛??紊???????綺??????堺?姒?????臀???膸贋?ゅ櫝?醇??莨?紊????鐚?絋????臂ょ?∞????????箙????膈???ラ????ú?????
+ - **臀?膸?箴?莎?**鐚?篏?筝阪???欠?-?????≦??罔≦??鐚?臀?膸?綮区??篌?綵怨????ц?純??
+ **筝坂??箙?荀???? Redis**鐚?
+ 筝肢???????筝阪????? **蕭???ц??** ??? **筝医???????井?勛?????**???綵?綺??????荀?鐚?
+ - **膽?絖?**鐚???颰紙?井??????????鐚?????????井?勤倧??勉??
+ - **篌?莚?膊∞??**鐚?絖????????隙??莚?篆≧?壔??
+ - **絎???句??莅?**鐚?絋????茵?网????莅≧?医??????????桁??鎖??倶??膈????
+ - **羔???奝?????**鐚?絎??ー膊???????綣?罩ュ????????篁糸?♂?????鐚???順?銀??筝?羔???奝?????絋? Kafka/RabbitMQ ??翫失紊э?????
+ - **???絽?綣????**鐚???????絽?綣??ッ紜?筝上?顖?紊?筝???腮????
+ - **??亥??腥咲?雁刈綣?**鐚?Redis 3.2+ ???箴?篋? GEO ??後?喝?巡擦???
+ 菴?篋???堺?壚??鐚?Redis ??????絖???号?у????井?勛?????篌???水櫆札絽??ユ?乗???????ц?醇????????綣????箴水?ð?с??
 34. 筝坂??箙?荀????Redis ???筝???? map/guava ???膽?絖??
+ 膈?鐚?
+ - **篏???????筝????**鐚?
+ - `Map` ??? Guava Cache ??? **??サ?亥??絖?**鐚???井??Û?????篋?綵???? JVM 菴?腮????絖?筝KK??絋????綺??????讐???紊??佀????≦??筝?鐚?罸??佀????≦???醇?????訓???膽?絖???壩?ロ?????羈???延昆??井?卡??箙????羈?絎??ー???絽?綣靶?絖????
+ - Redis ??? **???絽?綣靶?絖?**鐚???井???????????ス????? Redis ?????≦??筝?鐚??櫆札茴?紊?筝??????絎?箴???延昆莅翠?勉??
+ - **?????遵????????筝???贋??**鐚?
+ - Guava Cache ?櫆札莅丞舟菴??????狗?翫??紊у???????駈????後噲 `Map` ??翫ソ膊∞??鐚?篏?篁???倶?虁??腮??????????綺????????壩???????≦??絎???坂??絲取?雁??絖?筝√け???
+ - Redis ?櫆札???箙??????井???亥?????鐚???????????醇?√?????綛銀???櫆札膕丞`?ァ??? key ???菴??????狗?眼??
+ - **?????巡鍵絲????**鐚?
+ - Redis ???箴?篋? `Map` ??? Guava Cache 羃≧?????筝医????井?勛?????鐚?絋? List, Set, Sorted Set, Hash鐚???????絖????篏?鐚??櫆札羯∴恭??翫???????????羆????
+ - **???臂ゅ??蕭??櫜??**鐚?
+ - Redis ??壩??筝私??紊???九?????臂わ???櫆札???綮咲???櫜?????蕭???ц?順??膽?絖?膤紫??鐚?紊????紊ч?鎶九??莚傑?????紊ф?井?勰?????Guava Cache ???羈??????違??
+ - **菴?膸翫??膊∞??**鐚?
+ - Redis ??壚??筝??ス??????????\???櫆札?????セ??茵?????ァ???膊∞?????紊?篁遵????ï?????Guava Cache ???荀?筝?綺??????綺??????遵?????膸?絎????
+ **??紫??**鐚?絋?????Ū??荀?????????阪????????膽?絖???井?卡??筝?絲号?井???延昆??????箙???????蕭??櫜????ц??羆?筝?蕭?鐚?Guava Cache ??壚肩筝????????????í??篏?絋???????荀?莊?紊??佀????≦????延昆膽?絖???????荀???顔???????ц?遵????????с???????????荀?篏睡?? Redis ??号???????井?勛?????????????緒????d?? Redis ??壩?翫?????????????í??
 35. 絋?篏???? Redis 膸?莅∞?ス???????決倧??勰???
-36. 絋?篏??????ï???????????箙??????劫??
+ 膈?鐚??櫆札篏睡?? Redis ??? `Set` ??井?勛???????ョ??莅∞?ス???????件??Unique Users, UV鐚?莅翠?勰?????Set ?????合?号????膣???壚??鐚???????サ??????
+ ??隙??罩ラĽ絋?筝?鐚?
+ 1. **絎?箙? Key**鐚?筝堺?鎀ñ????ス???????欠??莅≦??箙?筝?筝??壚????? Key鐚?箴?絋? `unique_visitors:2025年06月25日`???
+ 2. **莅医???????決倧???**鐚?綵?????????決倧??勖?駈??絨??????欠????壚?????莚?鐚?絋??????? ID???Session ID ???莅上?? ID鐚?篏?筝阪??膣?鐚?篏睡?? `SADD` ??巡擦羞糸????医噲綺???? Set 筝KK??
+ ```redis
+ SADD unique_visitors:2025年06月25日 user123
+ SADD unique_visitors:2025年06月25日 user456
+ SADD unique_visitors:2025年06月25日 user123 // ???紊?羞糸??鐚?Set 篌???????サ???
+ ```
+ 3. **膸?莅∞?ス???????傑??**鐚?篏睡?? `SCARD` ??巡擦?キ??? Set 筝上??膣??????育???菴?筝??育?鎞掩????紊ñ????ス???????決倧??勰?????
+ ```redis
+ SCARD unique_visitors:2025年06月25日 // ???莅乗????? 2鐚?茵?ず??? 2 筝??ス????????
+ ```
+ 4. **莅丞舟菴??????狗??**鐚?筝坂????水?? Set 羂梧??紜???水???????紊????絖?鐚??櫆札筝肴??筝? Key 莅丞舟筝?筝?????????菴??????狗?器??罸?絋?膃コ??紊ò????????????
+ ```redis
+ EXPIRE unique_visitors:2025年06月25日 86400 // 24絨???九??菴????
+ ```
+ 菴?腱???号????ñ??篋? Set ????サ?????号?э??膊????蕭???????絲剛?????荀?膸?莅∞?劫????狗?贋侊鐚?絋????菴?7紊ú???????ス???????件???櫆札膸贋?ゅ??筝? Set鐚?罸鎀î??筝???綛銀戎??? `SUNION` ???綛九?????膸?莅\????????篏睡?? Redis ??? HyperLogLog 膸????菴?茵?菴?篌主??莅\?????絖?????????翫???篏?膸????筝???夌仮隋??種?????
+36. 絋?篏??????ï???????????箙??????劫???
+ 膈?鐚??????? Redis ???箙??????劫?鋇肢???????割??篏????筝???♂??羆?鐚???劫?????噲??井?????????у????ц?順??荀?羆????筝肢?????筝ょ?????箙??????劫???RDB鐚?Redis Database鐚???? AOF鐚?Append Only File鐚????
+* **RDB (Redis Database):**
+ * **??????:** 絎????絨????絖?筝下????井?勰??綽??т??絖???亥?????鐚??????? .rdb ???篁駈?????
+ * **篌????:**
+ * ??????膣у???????????篁駈????????紊?篁遵??菴?腱祉??
+ * 篆?絖??????壩??筝??狗?雁?合????井?勛?倶??鐚???√?????綺?辱???
+ * 絲号?ц?遵襲???莨?絨??絨ゅ?倶??????井?勰?鎀х???????灸?????
+ * **膽榊??:**
+ * 筝ゆ?綽??т????翫????? Redis 絎???削??篌?筝√け菴?罧究?狗?雁????井?勉??
+ * ??????綽??ф?九櫝?巡????糸??筝紫鎖腮?鐚??????割?????臀??? Redis ?????ロ????亥????シ????壕??鐚????
+ * **????????堺??:**
+ * 絲号?井?勌権紊延????????鐚??櫆札?・??????????????医??絨???句????井?勌権紊宴??
+ * ???荀?絎????紊?篁純??
+ * ???荀?綽?????√????井?勉??
+* **AOF (Append Only File):**
+ * **??????:** 莅医???????≦???・??九?亥??罸鋇?筝??????篏???巡擦鐚?????????≦?????????駈?????菴??????井?ц??菴?篋???巡擦??ユ?√????井?勉??
+ * **篌????:**
+ * ??井?勖?翫????Ǎ???櫆札??号?? `appendfsync` ???臀????ー罸霡????罩ユ??罸閩≦????ュ??罩ワ?????紊?筝√け 1 腱???? 0 腱??????井?勉??
+ * ??割戎 Redis 絎???削??箙??Ü??筝√け絨??????井?卡???????割?????罩ラ?????鐚????
+ * **膽榊??:**
+ * AOF ???篁狗??絽御?? RDB ???篁九ぇ???
+ * ??√????井?勰??絽御?? RDB ??≪??
+ * 絲号?ц?醇??筝?絎?綵怨??鐚?絨ゅ?倶??????蘂??????ュ?? `appendfsync always` ???臀勌?????
+ * **????????堺??:**
+ * 絲号?井?????????ц??羆????蕭?鐚?筝???遵俉綽?紊ч????井?勌権紊宴??
+ * ?櫆札?・???腮???∝????√?????綺???腮?蕭??????ц?遵????????
+* **絋?篏???????:**
+ * **篌?????????? AOF:** 絋????篏????綺????筝???醇?水??篁私????井?勌権紊縁??AOF ??壩?翫ソ????????í?????絽御ィ??? `appendfsync everysec` 綛活 絎??????у????ц?純??
+ * **篌?????????? RDB:** 絋????篏???醇・??????????????医??絨???句????井?勌権紊縁??綛銀????雁?????紊?篁遵????√?????綺???RDB ??壚?????????????í??
+ * **羞桁??篏睡?? (RDB + AOF):** 菴???夌?????ィ?????????臀勉??膸????筝よ?????篌???刻??篏睡?? AOF 篆?莚???井?????????э??莅丞舟 `appendfsync everysec`鐚?鐚??????九?????篏睡?? RDB 菴?茵?綽??у??篁純??Redis ?????壩?銀??篌???????莉? AOF ???篁倶?√????翫????雁????井?勉??
 37. Redis???箙??????井????膽?絖????箙??????ï俉鐚?
+ 膈?鐚?Redis ?????ï俉羔??????遺犬筝??拷???????箙??????井?勛????ï俉???篏?筝榊??絖???句????ï俉???絎?篁ス????号????????筝???????
+* **???箙??????井?勛????ï俉 (???絽御????井?勰?鍽???水嚩??雁?????腥咲?岩??莇?):**
+ * **????ァ???茹????:** 絎????????ァ脾????篏睡???????居??蘂?篌井?井??????粋????帥??
+ * **紜????脾????腥咲??:** ?????贋・?????号????夌??菴?茵? Redis ????????≦??紜????脾????絎拷?????ñ??脾???????篋????鐚????
+ * **篌???????箙????膈????:**
+ * 絋????篏睡?? RDB鐚??櫆札莪???? `save` ???臀卡????鎞?綽??ч?????鐚????篏? RDB ???篁九ぇ絨????
+ * 絋????篏睡?? AOF鐚??櫆札絎??????ц?? `BGREWRITEAOF` ??巡擦鐚????膽? AOF ???篁九ぇ絨????
+ * **??井????罅?/??欠?上??胼?:** 絨?筝?絽悟????????兊?井?勤??腱糸?医?銀??絖????鎧膸?鐚?絋?絲壕院絖???????綵?罅f?井????鐚?鐚??Ü?????菴????羇肢????井???? Redis 筝中??箙???????
+ * **篏睡?? SSD:** 絋??????&gt;散???莅醐??篏睡?? SSD ??推撮 HDD ?櫆札???蕭????箙??????ц?緒??綛九櫝?遵??莅御?顔??????????ヨ??莉純??
+* **篏?筝榊??絖???句????ï俉 (???絽御?????荀??????≧?翫?????莚傑???????翫ぇ???膽?絖?絎拷??):**
+ * **?????贋?ï俉 (Scale-up):** 紜?????????? Redis 絎?箴???????絖???? CPU 莎?羣????篏?菴??????ñ??????????コ????????
+ * **羂翫抗??ï俉 (Scale-out):** 菴???壩?翫幻???????号??鐚????菴?紜???? Redis 絎?箴???育????ュ?????茣?莉遵??絖???????筝肢????劫?????筝ょ??鐚?
+ * **筝私??紊???? + ?????? (絋? Redis Cluster):**
+ * **筝私??紊????:** 莅丞舟紊?筝ŭ???????刻????????莚糸?????鐚?綛銀??筝坂源?????号???????句??紊?篁純??篏?菴?筝???贋・紜??????紫??絖?絎拷?????
+ * **Redis Cluster:** 絨???井???????鐚?Shard鐚?絖??????医??筝? Redis ?????鴻??罸鋇?????壕??茣d??????????井?勉??絎∽?欠????篁g??鐚?絋? Codis???Twemproxy鐚?絨?莚傑??莊夌?怨?井3隋勛???????鴻??菴???????ー紊ц??罔∞??絖?羂翫抗??ï俉???????????号???????ï俉??駈???櫆札羞糸????亥???????刻????九?????菴?resharding絨???????罕巡??鐚?slots鐚?菴?腱糸?井?域????鴻??
+ * **篁g????????:** 篏睡??篁g???????≦?Ǎ??絋? Codis, Twemproxy鐚?絨?絎∽?欠?莚傑??????????医??腴夌??紊?筝? Redis 絎?箴????篁g??茣?茣h君??演?肢???????ï俉??駈??紜???????腴? Redis 絎?箴?綛狗??臀??遺撮??????
+ ??ï俉菴?腮????絽檎??荀?????????井?勤??腱祉???????&gt;賢??中?狗?眼??絎∽?欠???弱俉??х????勰??鐚?絨ゅ?倶??噲篋????鎖?????&lt;??
 38. Redis key???菴??????狗?翫??羂娯?????????????????箙?莅丞舟鐚?
+ 膈?鐚?菴?筝??勰?????膃? 29 蘂????紊?篋?鐚?莚桁?????膃? 29 蘂????膈?罅????
 39. ???篁ス?ラ?????菴?expire??ヨ倘臀?key ???菴??????狗?器????d??絲壕??????????井?勖??箙?紊????????
+ 膈?鐚?綵? Redis 筝TEL??筝? Key ???菴??????狗?翫?域松???鐚?菴?筝? Key 篌?茴????莅遺減菴????鐚?篏?絎?????????ゅ攻筝???夌????喝???????????Redis ??????篋???井?у????ゅ??絎?????????や犬腱?膈???ユ?ュ?????菴??????? Key鐚???隙??莚欠??筝?筝?蘂????紊????菴?腮?紊ц?翫??筝?鐚?
+1. **???莅域?????:** 綵?篏?篏睡?? `EXPIRE`???`SETEX`???`LPUSH` 絽????????狗?雁????巡擦莅丞舟 Key ???菴??????狗?贋?駈??Redis ??????篌?筝肴??筝? Key 莅医??筝?筝????????狗?贋?潟??
+2. **膈?緇???????:** Key ??井?????鐚?絎?綛銀??篌?腴???私?????絖?筝下Щ??ゃ??絎?篁???九櫆札茴?嚞???鐚?莚糸????亥???櫝?醇?壩?у?種????九??莚? Key 篌?茴??????わ??鐚?箙??櫆札茴???贋?逸??菴????絽娯??羝???ゅ?????菴???????莅逸??篏水?九??筝堺宛箙???????鐚????
+3. **???膸???????:** ???膸?鐚????菴???井?у????ゆ??絎?????????ゆ?阪?駈??菴?筝????????? Key 篌?茴?????ー綛銀?????絖?筝上????わ???????上??絖?腥咲?眼??
 40. Redis???菴??????勛???????ょ?????
+ 膈?鐚?Redis 篏睡??筝ょ??筝肢?????膈???ユ?ュ????よ???????? Key鐚?
+* **??井?у????? (Lazy Deletion):**
+ * **??????:** 筝?筝糸???????よ???????? Key????Ŭ??綵?絎∽?欠?絨?莚?莅翠?卡??莚糸??????????ョ??鐚?筝?筝?群膸颷??????? Key ??駈??Redis ???篌?罍???ヨ唫 Key ??????????鐚?絋????菴????鐚?絨援????喝????ゅ?????
+ * **篌????:** 絲号?ц?遵襲???絨???Ŭ???????荀???倶??????????ゆ??篏????
+ * **膽榊??:** 絋????筝?筝? Key 菴????篋?篏???炊??筝????茴?倧??卡??絎?篌?筝???雁????????絖?筝昭和????翫?域←莅翠?勖?倶??茴??????わ??菴??櫝?遵嚩??翫??絖?羈?羲????順?銀????夌??罩g?????絖?羈?羲??篏?篌?羌?換???絖?鐚????
+* **絎?????????? (Periodic Deletion / Active Expiration):**
+ * **??????:** Redis 篌?罸????筝?罧究?狗?器????? `hz` ???臀勰々?ァ??駈??藥?莅? 10Hz鐚?筝糸??罍???ヤ??罨≧?井????筝下??筝???????菴??????? Key鐚?綛九????ゅ??篁ケ??罸閩≧????ヤ??紊????筝?絎???育????? Key鐚?膊?羈???????篌????鐚????
+ * **篌????:** ?櫆札筝糸??羝????菴??????? Key鐚???水?????絖?羌?換??????菴??ァ??倶????ョ??蘂????????????器???櫆札綛活 CPU 篏睡??????????絖?篏睡???????
+ * **膽榊??:** 絋??????井????筝中??緇?紊?菴??????? Key鐚?絎?????????ゅ櫝?巡??羔????莨?紊???? CPU 莎?羣?鐚?綵怨?? Redis ??????綺????綺??????罩わ??Redis ?????銀??罸閩≦??????????よ?遵???????? Key ??育???????ц????狗?眼??
+* **??紫??:** Redis 膸????篏睡????筝ょ??膈???ワ??絎?????????よ??茣d源???羝????紊ч?????菴??????? Key鐚??????井?у????や??筝肴.???鐚?隋勌????d?????←絎?????????ゆ?阪?九???????亥??菴???? Key ???←莅翠?勖?銀????処←羝???ゃ??菴?腱?羞桁??膈???ュ??篆?莚????絖??????狗????上??膤紫????ц?巡????翫??緇?篋?莨?絅順??綛活 ???
 41. Redis??????絖????絎?篋?篌???????篁?箙?鐚?
+ 膈?鐚?綵? Redis ??????絖?篏睡??松??? `maxmemory` ???臀勛???????倶?駈??篌???????篁ヤ???????居??
+1. **茹???膈????:** Redis 篌???号?勰??臀勛?? `maxmemory-policy`鐚????絖?羞?羆亥????ワ????ュ?喝??絋?篏?紊??????井?井?勛???????ヨ噯羆????
+2. **紊??????医?????:**
+ * **絋????膈???ュ??莅御??羆井?井?? (絋? volatile-lru, allkeys-lru, volatile-random, allkeys-random, volatile-ttl):** Redis 篌???号?勛????ヤ???ー?????井?勌賢羞?羆遺???????? Key鐚?箴?絋?鐚?羞?羆井??菴????絨?篏睡???? Key鐚?鐚???九??筝堺?井?井???????腥咲?眼??絋???????羈??????倶??羆域恭紊??????井?卡???????ユ??篏??櫝?巡??紊沿乾鐚??????割?????臀卡??藥?莅ゆ?虁????????莚姒?????
+ * **絋????膈???ユ?? noeviction (筝?羞?羆?):** 菴???奝??莅ょ????ャ??綵????絖?羯≧?駈??Redis 篌????膸????????????ユ??篏?鐚?絋? SET, LPUSH 膈?鐚?鐚?綛区????????莚姒??`OOM command not allowed when used memory> 'maxmemory'`鐚????篏?莚糸?????篏?鐚?絋? GET鐚?篁???九櫆札罩e幻菴?茵????
+ * **絋????膈???ユ?????菴??????? (絋? volatile-lru, volatile-random, volatile-ttl):** ?Ü??羞?羆域倘臀勌??菴??????狗?雁?? Key???
+3. **綵怨??:**
+ * **?????ュけ茣?:** 綺??????綺??櫝?巡????九?医????ュけ茣ョ?????莚姒?????荀?紊????菴?篋?綣?絽吾??
+ * **??井?勌権紊演?????:** 絋????篏睡?? noeviction 膈???ワ??筝?綺????羃≧??紊?????????ュけ茣ワ???櫝?遵嚩??翫??莚ュ????ョ????井?勌権紊宴??
+ * **??ц?巡?????:** ??割戎羃≧????贋・???膸??????ワ??蘂?膵????羞?羆井??篏?箙??櫝?遵襲??? Redis ?????ц?純??
+4. **??水????号??:**
+ * ??????莅丞舟 `maxmemory` ??種??筝?荀?莇?菴??????≦???櫜?????絖????
+ * ??号?勌????♂??羆??????ï???????? `maxmemory-policy`???
+ * 篌??????井?勛?????鐚?篏睡????頑????????絖????膽????鐚?絋?篏睡????贋?育?????篁f?炊?勰?????茵Ǎ??篏睡?????膽ï??茵?篁f?水??絽?茵???鐚????
+ * 菴?茵?羂翫抗??ï俉鐚?絋?篏睡?? Redis Cluster鐚????
 42. Redis絋?篏???????絖?篌????鐚?
+ 膈?鐚?Redis ???絖?篌?????櫆札篁?紊?筝??拷?√?ユ??鐚?
+* **?????ï??????????井?勛?????:**
+ * ??号???堺?奝????ð???????????絖??????井?勛????????箴?絋?鐚???? `SET` 篁f?? `LIST` 絖??????壚?????膣?鐚???? `HASH` 絖????絲壕院絮???с??
+* **??ñ???????篌????:**
+ * Redis ??????篌???号?勖?井?勰???????????î????????綺?絮?膽??????劫?????篋?茹h??篋?膽????鐚?絋? ziplist, intset, hashtable 膈?鐚??????合?刻???櫆札???菴????臀卡??絋? `list-max-ziplist-size`, `hash-max-ziplist-entries` 膈?鐚???ュ失??銀戎?????頑????????絖????膽????鐚?????????壚????≦??莅吾??
+* **篏睡????雁冠????????井?勛瓜???:**
+ * 絨初?鋎睡????贋?域??筝??????膃?顕茵?ず??医?若??
+ * 篏睡???上??膃?顕???
+* **??????莅丞舟 Key ??? Value ?????水墾:**
+ * Key 絨初?靃???TEL????傑???櫝嚞??э????水??菴???炊????鋈???? Key???
+ * Value 箙?綺?絨初?靘у??鐚???水??絖???????篏?篆≧?壔??
+* **篏睡?? Hash 膸????絖????絲壕院:**
+ * 絲剛????????紊?筝?????х??絲壕院鐚?篏睡?? `HASH` 絖????罸????紊?筝??ス????? Key 絖??????頑????????絖?鐚?Redis ?????????篌????鐚????
+* **??ñ?? Redis 4.0+ ???罔≦????????:**
+ * 絋? `RedisBloom` 罔≦?????箴???? `CMS` (Count-Min Sketch) ??? `TFT` (Top-K) 膸????鐚??櫆札????????????絨????絖?????????灸??膸?莅♂???????? Top N鐚?菴?罸??????勰????井?勛?????鐚?絋? Sorted Set鐚??????????絖????
+* **莅丞舟 Key ???菴??????狗??:**
+ * 絲剛??筝贋?倶?井?卡??莅丞舟?????????菴??????狗?器??莅? Redis ?????羝????筝???????荀??????井?卡???????上??絖????
+* **?????ï???????????箙????膈????:**
+ * AOF ???篁狗??絽御?? RDB 紊э??絋????絲号?井?勌権紊延????????鐚?RDB ?櫝?醇?頑?????脾????腥咲?眼??絎?????????? AOF (`BGREWRITEAOF`) 箙??櫆札??鎞????篁九ぇ絨????
+* **篏睡?? Redis Cluster:**
+ * 羂翫抗???????櫆札絨???井??????e?医??筝?????刻??罸鋇?????合?∞???????井?勰????鎞?鐚??櫆札??贋???????医?ñ?????絖????
 43. Redis篋???∞??筝?筝??倶侊
+ 膈?鐚?Redis 篋???∞????ц??菴?腮??櫆札???筝坂札筝?筝?筝??倶侊鐚?
+1. **綣?紮?篋???? (MULTI):**
+ * 絎∽?欠???? Redis ?????? `MULTI` ??巡擦???
+ * Redis 菴???ヤ????∞?倶??鐚?箙????絎∽?欠??????????????????巡擦??巡??篌?腴???恰?ц??鐚??????虁←??上?ヤ??筝??????鐚???巡擦??????鐚?筝KK??
+2. **??ц????巡擦?????? (QUEUED):**
+ * ???篋???∞?倶??筝?鐚?絎∽?欠??櫆札膸х鮫??????紊?筝? Redis ??巡擦鐚?絋? `SET`, `GET`, `INCR` 膈?鐚????
+ * 絲剛??罸鋇??巡擦鐚?Redis 筝?篌?腴???恰?ц??鐚??????虁????? `QUEUED` 茵?ず??巡擦綏峨?ラ?????
+3. **??ц??篋???? (EXEC):**
+ * 絎∽?欠??????? `EXEC` ??巡擦???
+ * Redis 綣?紮????蕁阪????ц????巡擦??????筝下??????????巡擦???
+ * ??ц??絎???????鐚?Redis ?????坂????∞?倶??鐚?綛九??????????巡擦?????ц??膸????箴?罨∴?????膸?絎∽?欠????
+ * 絋??????? `EXEC` 箙??????????篋? `DISCARD` ??巡擦鐚??????上????ц????????筝下??????????巡擦鐚?綛狗????坂????∞?倶?????
+ 膊??????ヨ?絨掩?姒??`MULTI` -> `QUEUED` -> `EXEC`???
 44. Redis篋???∞?後?喝?巡擦
+ 膈?鐚?Redis 篋???∞?後?括????巡擦筝肢?????篁ヤ?????筝???
+* **`MULTI`:** ???莅遺??筝ŭ????≦?????綣?紮????箙???????????????巡擦??巡??茴??????????
+* **`EXEC`:** ??ц??篋???≦??筝中?????茴????????????巡擦???菴???壚????∞?????篋ゆ??篏????
+* **`DISCARD`:** ???羔?篋???\????上????ц??篋???≦??筝中?????茴????????????巡擦???菴???壚????∞?????羯????篏?鐚???上??綵????篋???\?????
+* **`WATCH key [key ...]`:** ???茹?筝?筝???紊?筝? Key???絋??????? `EXEC` ??ц??箙????鐚?菴?篋? Key 茴???銀??絎∽?欠?篆勖?剛??鐚???d??綵????篋???&gt;??篁ュけ茣ュ??膸?鐚?`EXEC` 菴????腥阪??紊?鐚????絽悟??篋?絎??ー膠私室箙?茹?????????阪?吟??
+* **`UNWATCH`:** ???羔? `WATCH` ??巡擦絲号????? Key ??????茹????絋???????篋???≧?ц?????莪???Ǎ?????羝???ゆ????????茹?鐚?篋???≦??筝?篌????筝? Key 茴?信??壕??紊沿乾???
 45. Redis篋???&gt;??莚????絖???у??鐚???壩?????羯????鐚?
+ 膈?鐚?
+* **???絖????:**
+ * Redis 篋????**??????篆?莚????絖????**???絎?篆?莚?篋???????筝下????巡擦荀?箙???醇?ц??鐚?荀?箙???巡????ц??鐚???? `EXEC` ??巡擦????????ц??????????灸??鐚????箙?絨掩?虁?鐚?篋???≦???????巡擦綺??????壚??筝坂??筝??岩????ц?????鐚?筝?篌?茴???銀??絎∽?欠??????巡擦?????KK??
+ * **篏????**鐚?絎?筝?篆?莚?篋???&gt;賢?????巡擦**筝?篌????筝咲??莚虁??筝中??**???絋????篋???&gt;賢??????筝??巡擦???筝肴喭羈????莚姒??罸?絋???巡擦??????篋?鐚???????羈???ц??鐚???d????? `EXEC` ??駈????岩肩篋???♂?巡??茴????羔?鐚?筝?篌???ц??篁私????巡擦???篏?絋??????巡擦??セ昆??壩3隋勛??鐚??Ŭ????筝肴??茵???狗??莚姒??罸?絋?絲剛??筝ŭ??絖?????? Key ??ц??篋????篋????篏?鐚?絲取?翫け茣ワ????銀????巡擦篁???銀??膸х鮫??ц?????菴?筝???井??????????絖???э???????????篏?荀?箙????????????鐚?荀?箙??????紊沿乾鐚?筝?紊沿乾??倶?????綏我?ц????????篏???処?????羯?鐚???????筝???????
+* **???羯?:**
+ * Redis 篋????**筝???壩??篌?膸???井??????鋈?筝???????羯?**???筝??????筝??巡擦???篋???&gt;賢??ц??紊沿乾篋?鐚?筝??????筝肴喭羈????莚?嚩??贋?岩肩篋???≦??羔?鐚?鐚?Redis 筝?篌????????ら??箙????綏牙????ц?????????????巡擦???絎??Ü??膸х鮫??ц????????筝上?î???????巡擦???
+ * ??壚???????????羯??????阪?倶?? `DISCARD` ??巡擦鐚?絎??櫆札??上??綵??????岩肩篋???≦??鐚?筝???ц??篁私????巡擦????Ϊ??鐚?絋????茴? `WATCH` ??? Key ??? `EXEC` ???茴?信??刻??篋???&gt;??篌?紊沿乾鐚?`EXEC` 菴????腥削??鐚?篏?菴?綛銀????奝??絲剛????≦????巡擦??ц?????莚夌?????羯????
+ ??紫??鐚?Redis 篋???≧??箴?篋?筝?腱?絨?紊?筝??巡擦????????ц???????劫???篆?莚?篋???巡擦??ц?????蕁阪????у????岩????э??荀?箙??????ц??鐚?荀?箙????筝???ц??鐚???ら?????莚中?????莚姒??鐚?篏?筝?篆?莚?罸鋇??巡擦??ц??????????????絖???э??箙?筝???壩???????巡擦??ц??紊沿乾??????羯???岩肩篋???&lt;??絲剛?????荀?筝ユ?? ACID ??号?х??紊???????篏?鐚????絽檎??荀?膸???? Lua ?????シ????銀??紊??????阪?倶?ュ???ー???
 46. Redis篋???≧?壩?????胼紙?у??鐚?
+ 筝???壩?????Redis 篋???&gt;賢?????巡擦?????ц?????筝?篌???????鐚???銀??絎∽?欠??櫆札綛九????ц????巡擦鐚??櫝?遵嚩??頑?顓紙??筝?????紊?莚祉??
 47. Redis???臂ょ??筝私??紊???倶─?????壩????欠??鐚?
+ 筝私??紊???倶─?????壚源篁?罔≦?????鐚?筝肢????壕??茣e???????????篏????莚紙??篏?鐚?篁??????劫Ű??茣e????銀源?????合????井?卡??紊????莚紙??篏????
 48. ???篋хッ紜?筝下?? redis ??壩??箙????讐???鐚?
+ ???篋хッ紜?筝右??絽檎????? Redis ???臂ゆ─綣????讐鐚??????コ源篁?紊???九????????鐚?篁ユ??蕭??櫜????у????ï????с??
 49. 莚頑?Redis???絽?罕順??网?綽?
+ Redis ???臂ゅ????岩肩??井?勰????????筝? 16384 筝???絽?罕緒??罸鋇??勖?号???? CRC16 ??弱噲 16384 ???罔≧?ョ`絎?絮?篋???ŭ肩罕緒??罕遵?????絨???医?隙???????鴻??
 50. Redis???臂や???????????篏?筝√け???鐚?筝坂??箙?鐚?
+ 篌??????????筝坂源?????拷??絽檎?????綣?罩ュ????倶?劫?鎞???井????罩ュ?遺???????刻??絋????筝肢????劫????井????罩ュ????????????????????鐚??櫝?遵嚩??顔???????????篏?筝√け???
 51. Redis???臂ゆ??紊ц????剛肩??井????絨?鐚?
+ Redis???臂ゆ??紊ц????剛肩??井?? 1000 筝ŝ??
 52. Redis???臂ゅ??篏??????ð?井????鐚?
+ Redis???臂や????壩???????ð?井????鐚?????????勰?遵???????????筝?筝??井????筝KK??
 53. Redis?????膾睡?????鐚?絋?篏????蕭?紊????CPU?????ñ????鐚?
+ ?櫆札???菴????紊???御????≦??筝?菴?茵?紊?筝? Redis 絎?箴???ユ??蕭?紊???? CPU ?????ñ???????
 54. 筝坂??箙?荀????Redis?????削?????篁?箙?膽榊?刻??
+ ????????堺?壚減篋???壩????翫ぇ?????井?勰???????顔?????綛九????????膽榊?劫????ロ??紜????篋?膤紫??紊??????э???櫝?遵嚩??贋?井???丈??鐚?篁ュ??莊??????堺??篏??????????篏????
 55. 篏???ラ???????ŭ??Redis?????阪???ー??号??鐚?
+ 絽梧????? Redis ?????阪???ー??号???????ロ??絎∽?欠??????冴??篁g???????削??絋? Twemproxy鐚????篁ュ?? Redis ???昆??????臂ゆ─綣????
 56. 膽?絖????絎??ー??????鐚?莅乗?∞??絖?荀?羈???鋌?箙?
+ 絎??ー??????鐚?膽?絖????絽娯??篋?綺????筝???井?勖??鐚?絋???井????鐚?箙???器?????菴?絨?蘂?膵?莅翠?勛????井?勖??莅∞??膸????絖??????????絖?筝昭和??篁ュ辱??????綺????膸左噯羆?鐚???鎞?絲号?井?勖?????莅翠??????????莅乗?&gt;??筝???サ????ス??絖???勉??膽?絖???若??菴??????狗?眼??膽?絖?膈???ワ??絋? LRU鐚?膈????
+ 莅乗?≧絵????膽?絖?腥翠???蘂?膵???ヨ哆筝?絖??????Key鐚????膽?絖????刊鐚?紊ч??Key?????区?????鐚????膽?絖???紫È鐚???下??Key紊掩????ソ?翫ぇ??顓傑??????????井?勖??鐚????膽?絖?筝???井????筝???贋?с??Key莅乗?&lt;??菴????膈???ャ??絎拷?頵???????蕭??櫜???????
 57. 絋?篏?茹e?? Redis ???綛九??腴?篋? Key ??勰??
+ ?櫆札篏睡?? Redis ???篋???\??MULTI/EXEC鐚???? Lua ?????ケ??Lua ?????サ?? Redis 筝中????絖???ц?????鐚???醇?翫ソ??遺??莚?紊?筝? Redis ???篏?篏?筝坂??筝??岩??筝?茴??????KK???Ί??腱???劫????壚戎??? SETNX鐚???? SET with NX option鐚??????????莚???阪?九???ー膊??????????絽?綣???????
 58. ???絽?綣?Redis???????????菴?????????茹?罔&gt;????ヤ????????絅緒??筝坂??箙?鐚?
+ 綮肴佈??????絨沿?????綛区倘莅≦??絽?綣? Redis ??号????????筝坂???????肴??腱糸?医??絽?綣闉??????井?勤??腱祉????倶??莪???眼??絎∽?欠???拷??膈?紊????綏ヤ??鐚???????茹?罔&gt;????ュ????拷???????サ??蕋???î?????絽檎???????????茹?????櫆札??翫ソ??井?壩??筝???≦????随????水????ц?順?狗?????
 59. 篁?箙???? RedLock鐚?
+ RedLock ??壚??腱????絽?綣????膊?羈?鐚???????В??喝??紊?筝? Redis 絎?箴?筝?絎??ー??翫????????翫??????????絽?綣?????????勰?????絎????菴????紊?筝??ス????? Redis 絎?箴?筝??キ??????鐚?綛狗??莚?紊у????医??箴????????????キ????????ユ??蕭???????絎??????э????我2?????号????????臀?膸??????阪嚩??雁?????紊掩?????
 60. Redis??壩?????Java絎∽?欠???醇????ŭ??鐚?絎???号ィ????????ŭ肩鐚?
+ 絽梧????? Java 絎∽?欠???? Jedis???Lettuce???Redisson 膈????絎???号押??????隋勖??絎???壚???ィ???鐚?篏? Lettuce ??? Redisson ?????狗????ц?純????壩??菴??・羆????綣?罩ユ??篏???????綺?綣靶?腮?鐚?Lettuce鐚?篁ュ??蕭?膾х?号?э??Redisson鐚????紊?????ィ??????Lettuce ?????? Netty 綺?絮??????翫ソ???菴??・膊∞???????顒勖?壩??鐚????侮紊???堺?壚????壩?雁ー篁g???????í??
 61. 筝坂??箙?Redis??????篏??????絖???х??鐚????箙?篆?莚????絖????
+ Redis ????????≦?巡擦?????絖???х??鐚????筝阪???????巡擦??ц??罔≦???????膾睡?????鐚?紊??????巡擦???膾睡???Ŭ??筝?筝????????巡擦篌?蕁阪????ц??鐚?筝?筝??巡擦??ц??絎???????鐚?筝?篌???ц??筝?筝?筝??巡擦???篋???\??MULTI/EXEC鐚????菴?絨?紊?筝??巡擦??????鐚?篆?莚?菴?篋???巡擦篏?筝坂??筝??岩?????絖???у?井?ц?????Lua ?????ソ??菴???? Redis 筝左←???絖??????ц????ヤ??莚??????サ???????????篏???????絖???с??
 62. Redis絽梧????ц?初?勰?????茹e?恰?号??鐚?
+ 絽梧????勰??鐚?臀?膸?綮区????????絖?筝?莇潟??CPU ??狗?????紊ч?? Key 菴????絲取?? CPU 蕋???????紊? Key/Hot Key ??勰????????箙????綵怨????ц?順?????
+ 茹e?恰?号??鐚?篌????臀?膸????臀勉????????茹???????絖?鐚?篏睡?????????????井?勛???????????膽í??羞?羆亥????ワ?????????ァ CPU 篏睡?????莅丞舟????????? Key 菴????膈???ャ??篏睡?? SCAN ??巡擦羝?菴?綣鎀????紊? Key ???????????水??篋х??莇?紊? Key???篏睡?? Pipeline ??鎞? RTT???篌???????箙???????臀卡??絋? AOF ??????鐚????篏睡????臂ゅ????e????????????ァ??下?? Key 綛九??膽?絖?膈????
 63. 筝?筝???膃?顕膠糸???????取?遵????????紊у俉????????絨?鐚?
+ 筝?筝???膃?顕膠糸???????惹??紊у櫆札絖???? 512 MB ?????井?勉??
 64. Redis絋?篏????紊ч????井?勖????ワ??
+ ?櫆札篏睡?? Redis ???膊♂??鐚?Pipeline鐚??????姒??絨?紊?筝??巡擦??????筝?罨≧?у?????膸? Redis ?????≦?Ǎ????鎞?臀?膸?緇?菴???狗?器??RTT鐚????絲剛?????絽後ぇ?????井?勰??鐚??櫆札??????篏睡?? Redis ??? RDB 綽??у?????鐚????菴? `redis-cli --pipe` ???筝??????絲弱?ュ轡??件??絋? `redis-benchmark` 罔≧??鐚?????????箙??????ソ????? Pipeline鐚????
 65. ???絋?Redis?????∽??1篋推肩key鐚???銀賢???10w筝?key??壚札???筝??阪?????綏牙?ョ?????膽?綣?紊雁??鐚?絋????絨?絎?篁サ??????上?堺?ワ??
+ ?櫆札篏睡?? `SCAN` ??巡擦????????????膃?─綣????箴?絋?鐚?絋???????膽???? `user:12345:history:`鐚??櫆札??ц?? `SCAN cursor MATCH user:12345:history:* COUNT num`???`SCAN` ??巡擦??壩??菴?綣????鐚??櫆札??水????? `KEYS` ??巡擦??f?潔?糸????岩肩 Redis ?????≦?Ǎ??`MATCH` ?????亥??篋???拷????劫??罔≦????? Key鐚?`COUNT` ?????医産莅勤倘臀勌??筝???紊х????種??絋? 1000 ?????顔??鐚???ユ??蕭???????????????????荀?緇?ッ莪???? `SCAN` ??翫?井幻??? `cursor` 菴???? 0???
 66. 篏睡??Redis???菴?綣?罩ラ????????鐚??????篏?絎??ー???鐚?
+ ?櫆札篏睡?? LPUSH ??巡擦絨?篁糸?≧ィ??ュ??茵Ǎ??BRPOP ??巡擦??糸??綣???医????坂算??&lt;??
 67. Redis絋?篏?絎??ー綮倶?狗?????鐚?
+ ?櫆札篏睡?? ZSET鐚?絨?篁糸?≦??菴??????狗?岩??筝?score鐚???井????????菴? ZRANGEBYSCORE ?????冴??
 68. Redis?????区??腮?絋?篏?綏ヤ?????鐚?
+ ???菴?羞?羆亥????ワ??絋? LRU???TTL鐚???????絖?筝?莇恰?区?????????ら?????????弱噲???
 69. ??下?号?井??????傑?井?勖?壚??箙?
-70. 篏睡????Redis??ŭ????巡擦鐚?
\ No newline at end of file
+ ??下?号?井?勖?虁倧??勰?????蕭??????井?卡????傑?井?勖?虁倧??勰?????篏??????井?勉??
+70. 篏睡????Redis??ŭ????巡擦鐚?
+ 絋? SET???GET???DEL???LPUSH???RPUSH???LPOP???RPOP???LPUSHX???RPUSHX???EXPIRE???TTL???HSET???HGET???SADD???SREM???SMEMBERS???ZADD???ZRANGE???ZRANK???ZREM???SCAN 膈????
\ No newline at end of file
diff --git "a/345円244円247円345円216円202円351円235円242円350円257円225円347円234円237円351円242円230円/351円230円277円351円207円214円344円270円200円351円235円242円357円274円214円347円273円231円344円272円206円345円207円240円346円235円241円SQL357円274円214円351円227円256円351円234円200円350円246円201円346円211円247円350円241円214円345円207円240円346円254円241円346円240円221円346円220円234円347円264円242円346円223円215円344円275円234円357円274円237円.md" "b/345円244円247円345円216円202円351円235円242円350円257円225円347円234円237円351円242円230円/351円230円277円351円207円214円344円270円200円351円235円242円357円274円214円347円273円231円344円272円206円345円207円240円346円235円241円SQL357円274円214円351円227円256円351円234円200円350円246円201円346円211円247円350円241円214円345円207円240円346円254円241円346円240円221円346円220円234円347円264円242円346円223円215円344円275円234円357円274円237円.md"
index a695048..c7732f8 100644
--- "a/345円244円247円345円216円202円351円235円242円350円257円225円347円234円237円351円242円230円/351円230円277円351円207円214円344円270円200円351円235円242円357円274円214円347円273円231円344円272円206円345円207円240円346円235円241円SQL357円274円214円351円227円256円351円234円200円350円246円201円346円211円247円350円241円214円345円207円240円346円254円241円346円240円221円346円220円234円347円264円242円346円223円215円344円275円234円357円274円237円.md"
+++ "b/345円244円247円345円216円202円351円235円242円350円257円225円347円234円237円351円242円230円/351円230円277円351円207円214円344円270円200円351円235円242円357円274円214円347円273円231円344円272円206円345円207円240円346円235円241円SQL357円274円214円351円227円256円351円234円200円350円246円201円346円211円247円350円241円214円345円207円240円346円254円241円346円240円221円346円220円234円347円264円242円346円223円215円344円275円234円357円274円237円.md"
@@ -1,104 +1,104 @@
-### 念冱
+### ???荐?
 
-嗤了涛嗔肇唖戦中編?麿傍中編郊公阻叱訳臥儂SQL?諒:俶勣峇佩叱肝峯朴沫荷恬?厘涛嗔輝扮頁嗤泣秣議?朔栖絶床房深?嘉窟孖祥頁深沫哈議叱倖児粥岑紛泣~~ 云猟厘断蛍湘倖沫哈岑紛泣?匯軟栖冥網匯和。泌惚嗤音屎鳩議三?散哭峺竃込?匯軟僥楼~
+???篏????????サ??翠????∵??鐚?篁?莚顔?∵??絎?膸?篋??????≧?ヨ哆SQL鐚????:???荀???ц?????罨≧?????膣∽??篏?鐚??????????綵???倶?壩????号?窮??鐚??????ュ?潔????????鐚????????ー絨掩?虁??膣√????????筝??榊????ヨ?????~~ ??シ?????篁サ??箙?筝?刈綣???ヨ????刻??筝?莎傑?ユ「莅?筝?筝????絋???????筝?罩g`???莚?鐚?罨∵???????阪??鐚?筝?莎桁6箙?~
 
-- 巷巉催?**趣弥苔議弌槻頃**
-- github仇峽?湖仍耽薪star
+- ??コ???埦??**??∞?域?榊??絨???桁9**
+- github??医??鐚????莪∽?馺?star
> https://github.com/whx123/JavaHome
 
-- 中編郊深泣岻沫哈頁焚担?
-- 中編郊深泣岻沫哈窃侏
-- 中編郊深泣岻葎焚担僉夲B+峯恬葎沫哈潤更
-- 中編郊深泣岻匯肝沫哈朴沫狛殻
-- 中編郊深泣岻顕固沫哈
-- 中編郊深泣岻沫哈払丼魁尚
-- 中編郊深泣岻恷恣念弸
-- 中編郊深泣岻沫哈和容
-- 中編郊深泣岻寄燕耶紗沫哈
+- ??∵??絎??????剛??膣√????壚??箙?鐚?
+- ??∵??絎??????剛??膣√??膠糸??
+- ??∵??絎??????剛??筝坂??箙???????B+???篏?筝榊刈綣?膸????
+- ??∵??絎??????剛??筝?罨∞刈綣????膣∵??腮?
+- ??∵??絎??????剛??荀????膣√??
+- ??∵??絎??????剛??膣√??紊掩????堺??
+- ??∵??絎??????剛?????綏???膽?
+- ??∵??絎??????剛??膣√??筝??ィ
+- ??∵??絎??????剛??紊ц;羞糸??膣√??
 
-### 匯、中編郊深泣岻沫哈頁焚担?
+### 筝??????∵??絎??????剛??膣√????壚??箙?鐚?
 
 ![](https://p1-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/21eed26e34534b51aadf28d5defaed7e~tplv-k3u1fbpfcp-watermark.image)
 
-- 沫哈頁匯嶽嬬戻互方象垂臥儂丼楕議方象潤更。万辛參曳恬匯云忖灸議朕村?辛參逸低酔堀孀欺斤哘議芝村。
-- 沫哈匯違贋刈壓甘徒議猟周嶄?万頁媼喘麗尖腎寂議。
-- 屎侭僚邦嬬墮巍?匆嬬顕巍。癖輝議沫哈嬬戻互臥儂丼楕?狛謹議沫哈氏唹峒方象垂燕議峨秘才厚仟孔嬬。
+- 膣√????壚??腱???醇??蕭???井??????ヨ哆???????????井?勛????????絎??櫆札罸?篏?筝???サ????悟???????鐚??櫆札絽勌??綽?????上?医噲綺????莅医?????
+- 膣√??筝???サ???????????????????篁銀賢鐚?絎??????????ñ??腥咲?雁?????
+- 罩f??莪?羂頑?処十???鐚?箙???処???????????綵????膣√????醇??蕭???ヨ哆??????鐚?菴?紊????膣√??篌?綵怨????井????茵????????ュ????贋?医????純??
 
-### 屈、沫哈嗤陳乂窃侏窃侏
+### 篋????膣√???????ŭ??膠糸??膠糸??
 
 ![](https://p9-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/cf6725e1a8cb44b496cca8fa45e15c2f~tplv-k3u1fbpfcp-watermark.image)
 
-#### 方象潤更略業
+#### ??井?勛?????膸翫墾
 
-- B+峯沫哈?侭嗤方象贋刈壓匐徨准泣?鹸墫業葎O(logn)?癖栽袈律臥儂。
-- 込錬沫哈: 癖栽吉峙臥儂?殊沫丼楕互?匯肝欺了。
-- 畠猟沫哈?MyISAM才InnoDB嶄脅屶隔聞喘畠猟沫哈?匯違壓猟云窃侏char,text,varchar窃侏貧幹秀。
-- R-Tree沫哈: 喘栖斤GIS方象窃侏幹秀SPATIAL沫哈
+- B+???膣√??鐚?????????井???????????嚭???????刻??紊????綺?減O(logn)鐚????????????贋?ヨ哆???
+- ???絽?膣√??: ??????膈???惹?ヨ哆鐚?罍?膣∽?????蕭?鐚?筝?罨≦?遺?????
+- ??????膣√??鐚?MyISAM???InnoDB筝右?醇?壩??篏睡????????膣√??鐚?筝???サ???????ス瓜???char,text,varchar膠糸??筝????綮冴??
+- R-Tree膣√??: ?????ュ噲GIS??井?勛瓜??????綮?SPATIAL膣√??
 
-#### 麗尖贋刈略業
+#### ??ñ??絖????惨綺?
 
-- 詔鹿沫哈?詔鹿沫哈祥頁參麼囚幹秀議沫哈?壓匐徨准泣贋刈議頁燕嶄議方象。
-- 掲詔鹿沫哈?掲詔鹿沫哈祥頁參掲麼囚幹秀議沫哈?壓匐徨准泣贋刈議頁麼囚才沫哈双。
+- ??????膣√??鐚???????膣√??絨掩?壚札筝脂????綮榊??膣√??鐚?????嚭???????劫?????????虁;筝下????井?勉??
+- ?????????膣√??鐚??????????膣√??絨掩?壚札???筝脂????綮榊??膣√??鐚?????嚭???????劫?????????壚源?????膣√????????
 
-#### 貸辞略業
+#### ??肢??膸翫墾
 
-- 麼囚沫哈?匯嶽蒙歩議率匯沫哈?音塋俯嗤腎峙。
-- 噸宥沫哈?MySQL嶄児云沫哈窃侏?塋俯腎峙才嶷鹸峙。
-- 選栽沫哈?謹倖忖粁幹秀議沫哈?聞喘扮恆儉恷恣念弸圻夸。
-- 率匯沫哈?沫哈双嶄議峙駅倬頁率匯議?徽頁塋俯葎腎峙。
-- 腎寂沫哈?MySQL5.7岻朔屶隔腎寂沫哈?壓腎寂沫哈宸圭中恆儉OpenGIS叱採方象庁侏号夸。
+- 筝脂?勛刈綣?鐚?筝?腱???号???????壚??膣√??鐚?筝????莅御??腥阪?若??
+- ??勰??膣√??鐚?MySQL筝上?堺?ス刈綣?膠糸??鐚????莅悟Ã??弱?????紊???若??
+- ??????膣√??鐚?紊?筝???罧球??綮榊??膣√??鐚?篏睡????狗?球妾???綏???膽??????????
+- ??壚??膣√??鐚?膣√?????筝下????弱??蕁紙???壚?????鐚?篏??????莅娯減腥阪?若??
+- 腥咲?雁刈綣?鐚?MySQL5.7箙??????壩??腥咲?雁刈綣?鐚????Ã??雁刈綣?菴???拷?∫?球妾OpenGIS???篏???井?勖─???茹???????
 
-### 眉、中編郊深泣岻葎焚担僉夲B+峯恬葎沫哈潤更
+### 筝??????∵??絎??????剛??筝坂??箙???????B+???篏?筝榊刈綣?膸????
 
-辛參貫叱倖略業肇心宸倖諒籾?臥儂頁倦校酔?丼楕頁倦糧協?贋刈方象謹富?參式臥孀甘徒肝方吉吉。葎焚担音頁込錬潤更?葎焚担音頁屈我峯?葎焚担音頁峠財屈我峯?葎焚担音頁B峯?遇陶陶頁B+峯椿?
+?櫆札篁????筝?惨綺?サ???菴?筝??勰??鐚???ヨ哆???????綽??????????????┳絎?鐚?絖??????井????絨?鐚?篁ュ????ユ?丞?????罨≧?亥??膈????筝坂??箙?筝??????絽?膸????鐚?筝坂??箙?筝???壚????????鐚?筝坂??箙?筝????抗茵&gt;????????鐚?筝坂??箙?筝????B???鐚?????????????B+????????
 
-厘断亟匍暦SQL臥儂扮?寄謹方秤趨和?脅頁袈律臥儂議?泌匯和SQL
+???篁サ??筝????SQL??ヨ哆??駈??紊у????井????灸??鐚???醇?虁????贋?ヨ哆???鐚?絋?筝?筝?SQL
 ```
 select * from employee where age between 18 and 28;
 ```
-#### 葎焚担音聞喘込錬潤更?
-厘断岑祇込錬潤更?窃貌k-v潤更?匆祥頁?key才value頁匯斤匯購狼。万喘噐**吉峙臥儂**珊辛參?徽頁袈律臥儂万頁涙嬬葎薦議填。
+#### 筝坂??箙?筝?篏睡?????絽?膸????鐚?
+???篁ス?ラ?????絽?膸????鐚?膠私室k-v膸????鐚?箙?絨掩?姒??key???value??壚??絲剛????括鎧???絎????篋?**膈???惹?ヨ哆**菴??櫆札鐚?篏???虁????贋?ヨ哆絎???壩????巡減???????????
 
-#### 葎焚担音聞喘屈我峯椿?
+#### 筝坂??箙?筝?篏睡??篋????????????
 
-枠指吮和屈我峯屢購岑紛晴~ 侭僚**屈我峯?蒙泣泌和?**
-- 耽倖潤泣恷謹曾倖徨峯?蛍艶各葎恣徨峯才嘔徨峯。
-- 恣徨准泣議峙弌噐輝念准泣議峙?輝念准泣峙弌噐嘔徨准泣峙
-- 競極議准泣各葎効准泣?短嗤徨准泣議准泣峙各葎匐徨准泣。
+??????綽?筝?篋?????????後?括?ヨ?????~ ???莪?**篋???????鐚???合?劫??筝?鐚?**
+- 罸鋇?????号??紊?筝や肩絖????鐚???????О筝阪窪絖????????勀????????
+- 綏????????合????弱?鋋?綵?????????合????種??綵?????????劫?弱?鋋??勀???????劫??
+- 蕁句?????????合О筝肴???????刻??羃≧??絖??????合???????劫?主О筝阪嚭???????鴻??
 
-厘断辻今嶄?載否叟祥検孖竃宸嶽屈我峯潤更夕?
+???篁セ??羌隙賢鐚?緇?絎号??絨掩貴?ー??肴??腱?篋???????膸??????常??
 ![](https://p9-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/8d4c349a7bda4b3db1791f9cff9c093e~tplv-k3u1fbpfcp-watermark.image)
 
-徽頁椿?嗤乂蒙歩屈我峯?万辛嬬宸劔議填?
+篏???????????篋???号??篋???????鐚?絎??櫝?処????欠???????
 ![](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/97b71a48d43545a0bc20a55adf2be207~tplv-k3u1fbpfcp-watermark.image)
 
-泌惚屈我峯蒙歩晒葎匯倖全燕?屢輝噐畠燕膝宙。椎担珊勣沫哈孤啄兔?咀緩?匯違屈我峯音癖栽恬葎沫哈潤更。
+絋????篋?????????号?????筝坂??筝??乗;鐚???後??篋????;???????????d??菴?荀?膣√??綛峨?????鐚????罩わ??筝???コ????????筝???????篏?筝榊刈綣?膸???????
 
-#### 葎焚担音聞喘峠財屈我峯椿?
+#### 筝坂??箙?筝?篏睡??綛活 篋????????????
 
-峠財屈我峯蒙泣?万匆頁匯薪屈我臥孀峯?販採准泣議曾倖徨峯互業恷寄餓葎1。侭參祥音氏竃孖蒙歩晒匯倖全燕議秤趨晴。
+綛活 篋?????????合?刻??絎?箙???壚??蘂?篋??????ユ?丈??鐚?篁私???????合??筝や肩絖????蕭?綺???紊у勲筝?1??????篁ュ葦筝?篌???榊ー??号?????筝?筝??乗;????????球????
 
 ![](https://p9-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/74afa9b54e7f4c0996ff83e66016c09a~tplv-k3u1fbpfcp-watermark.image)
 
-徽頁椿?
-- 峠財屈我峯峨秘賜宀厚仟頁?俶勣恣傴嘔傴略隔峠財?略擦旗勺寄
-- 泌惚方楚謹議三?峯議互業氏載互。咀葎方象頁贋壓甘徒議?參万恬葎沫哈潤更?耽肝貫甘徒響函匯倖准泣?荷恬IO議肝方祥謹晴。
+篏????????
+- 綛活 篋????????????ユ???????贋?井?姒?????荀?綏????勄??膸贋??綛活 鐚?膸贋?や撮篁桁ぇ
+- 絋??????育?鎀????莚?鐚???????蕭?綺???緇?蕭???????筝堺?井?勖???????????????鐚?篁ュ??篏?筝榊刈綣?膸????鐚?罸閩&gt;??脾????莚糸??筝?筝?????刻?????篏?IO???罨≧?医葦紊??????
 
 
-#### 葎焚担音聞喘B峯椿?
+#### 筝坂??箙?筝?篏睡??B????????
 
 
-方象楚寄議三?峠財屈我峯議互業氏載互?氏奐紗IO啄。椎葎焚担音僉夲揖劔方象楚?**互業厚茜議B峯**椿?
+??井?勰?鎀х??莚?鐚?綛活 篋??????????蕭?綺???緇?蕭?鐚?篌?紜????IO????????d減篁?箙?筝??????ï????傑?井?勰???**蕭?綺??雁?勛??B???**?????
 
 ![](https://p6-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/acc8f2e2cfb54092b4fb131e500334a3~tplv-k3u1fbpfcp-watermark.image)
 
-B峯屢斤噐峠財屈我峯?祥辛參贋刈厚謹議方象?互業厚詰。徽頁恷朔葎封僉夲B+峯椿?咀葎B+峯頁B峯議幅雫井?
-- B+峯掲匐徨准泣貧頁音贋刈方象議?叙贋刈囚峙?遇B峯准泣嶄音叙贋刈囚峙?匆氏贋刈方象。innodb嶄匈議潮範寄弌頁16KB?泌惚音贋刈方象?椎担祥氏贋刈厚謹議囚峙?屢哘議峯議竣方?准泣議徨准泣峯?祥氏厚寄?峯祥氏厚茜厚砥?泌緩匯栖厘断臥孀方象序佩甘徒議IO肝方嗤氏壅肝受富?方象臥儂議丼楕匆氏厚酔。
-- B+峯沫哈議侭嗤方象譲贋刈壓匐徨准泣?遇拝方象頁梓孚乏會電双議?全燕銭彭議。椎担B+峯聞誼袈律臥孀?電會臥孀?蛍怏臥孀參式肇嶷臥孀延誼呟械酒汽。
+B?????後噲篋?綛活 篋???????鐚?絨怨櫆札絖??????翫???????井?卡??蕭?綺??岩?????篏???壩?????筝榊????????B+???????????筝?B+??????B?????????膾х??鐚?
+- B+???????嚭???????剛????壚??絖??????井?勛??鐚?篁?絖???????種?????B????????剛賢筝?篁?絖???????種??箙?篌?絖??????井?勉??innodb筝右ゝ???藥?莅ゅぇ絨????16KB鐚?絋????筝?絖??????井?卡????d??絨延??絖??????翫?????????種????後?????????????倶?逸???????合??絖??????号??鐚?絨延????翫ぇ鐚????絨延????雁?勖?頑??鐚?絋?罩や????ユ??篁シ?ユ?丈?井?勤??茵?脾???????IO罨≧?井??篌????罨≦?鎞?鐚???井?勖?ヨ哆?????????箙?篌???翫辱???
+- B+???膣√?????????????井????絖????????嚭???????刻?????筝???井?勖?壩????ч〆綺??????????鐚???乗;菴????????????d??B+???篏水???????贋?ユ?常?????綺???ユ?常?????膸???ユ?鞘札????サ?????ユ?上??緇?綣?絽悟????????
 
-### 膨、中編郊深泣岻匯肝B+峯沫哈朴沫狛殻
+### ????????∵??絎??????剛??筝?罨?B+???膣√?????膣∵??腮?
 
-**中編郊?** 邪譜嗤參和燕潤更?旺拝嗤宸叱訳方象
+**??∵??絎?鐚?** ???莅丈??篁ヤ??茵??????鐚?綛銀?????菴??????≧?井??
 ```
 CREATE TABLE `employee` (
 `id` int(11) NOT NULL,
@@ -110,137 +110,137 @@ CREATE TABLE `employee` (
 KEY `idx_age` (`age`) USING BTREE
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
 
-insert into employee values(100,'弌戴',43,'2021-01-20','0');
-insert into employee values(200,'拭旬',48,'2021-01-21','0');
-insert into employee values(300,'從范',36,'2020-01-21','1');
-insert into employee values(400,'羨碕',32,'2020-01-21','0');
-insert into employee values(500,'叟儻',37,'2020-01-21','1');
-insert into employee values(600,'弌嘱',49,'2021-01-21','0');
-insert into employee values(700,'弌凰',28,'2021-01-21','1');
+insert into employee values(100,'絨鋍?',43,'2021-01-20','0');
+insert into employee values(200,'篆????',48,'2021-01-21','0');
+insert into employee values(300,'膣???',36,'2020-01-21','1');
+insert into employee values(400,'腴?膾?',32,'2020-01-21','0');
+insert into employee values(500,'???菴?',37,'2020-01-21','1');
+insert into employee values(600,'絨????',49,'2021-01-21','0');
+insert into employee values(700,'絨????',28,'2021-01-21','1');
 ```
 
-**中編郊?** 泌惚峇佩參和議臥儂SQL?俶勣峇佩叱肝議峯朴沫荷恬?辛參鮫和斤哘議沫哈潤更夕~
+**??∵??絎?鐚?** 絋??????ц??篁ヤ???????ヨ哆SQL鐚????荀???ц?????罨∞????????膣∽??篏?鐚??櫆札??私??絲劫?????膣√??膸???????~
 ```
 select * from Temployee where age=32;
 ```
 
-**盾裂?** 凪糞宸倖?中編郊祥頁深賀昨僉繁頁倦母呂B+峯沫哈潤更夕。辛參崧輯從指基~
+**茹f??鐚?** ??九??菴?筝?????∵??絎?絨掩?虁??絲???????篋堺?????????B+???膣√??膸??????障???櫆札?????援勧???膈?~
 
-- 枠鮫竃`idx_age`沫哈議沫哈潤更夕?寄古泌和?
+- ?????糸??`idx_age`膣√?????膣√??膸??????常??紊ф??絋?筝?鐚?
 
 ![](https://p1-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/f88457b43e354ca18795fa0033ad075f~tplv-k3u1fbpfcp-watermark.image)
 
-- 壅鮫竃id麼囚沫哈?厘断枠鮫竃詔怛沫哈潤更夕?泌和?
+- ?????糸??id筝脂?勛刈綣?鐚????篁サ????糸?肴????靘√??膸??????常??絋?筝?鐚?
 
 ![](https://p9-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/963a8dacb39345008c93b1d0ea079eec~tplv-k3u1fbpfcp-watermark.image)
 
 
-咀緩?宸訳 SQL 臥儂囂鞘峇佩寄古送殻祥頁輯從?
-- 1. 朴沫`idx_age`沫哈峯?繍甘徒翠1紗墮欺坪贋?喇噐32<37,朴沫恣揃蛍屶?欺甘徒儖峽甘徒翠2。 -- 2. 繍甘徒翠2紗墮欺坪贋嶄?壓坪贋写偬演煽?孀欺age=32議芝村?函誼id = 400. -- 3. 鎮欺id=400朔?指欺id麼囚沫哈峯。 -- 4. 朴沫`id麼囚`沫哈峯?繍甘徒翠1紗墮坪贋?壓坪贋演煽?孀欺阻400?徽頁B+峯沫哈掲匐徨准泣頁音隠贋方象議。沫哈氏写偬朴沫400議嘔蛍屶?欺甘徒儖峽甘徒翠3. -- 5. 繍甘徒翠3紗墮坪贋?壓坪贋演煽?孀欺id=400議芝村?鎮欺R4宸匯佩議方象?挫議?寄孔御撹。 +???罩わ??菴???? SQL ??ヨ哆莚上媳?ц??紊ф??羌?腮?絨掩?奝?援勧鐚? +- 1. ???膣?`idx_age`膣√?????鐚?絨?脾???????1???莉遵?医??絖?鐚???延??32<37,???膣√窪莊?????姒????亥?????絲糸??脾???????2??? +- 2. 絨?脾???????2???莉遵?医??絖?筝昭和????????絖?膸х鮫??????鐚???上??age=32???莅医??鐚????緇?id = 400. +- 3. ??水??id=400???鐚???????id筝脂?勛刈綣??????? +- 4. ???膣?`id筝脂??`膣√?????鐚?絨?脾???????1???莉遵??絖?鐚???????絖???????鐚???上?遺??400鐚?篏????B+???膣√??????嚭???????号?壚??篆?絖???井?勛?????膣√??篌?膸х鮫???膣?400????勀????姒????亥?????絲糸??脾???????3. +- 5. 絨?脾???????3???莉遵??絖?鐚???????絖???????鐚???上??id=400???莅医??鐚???水??R4菴?筝?茵??????井?卡??絅順??鐚?紊у??????????? -咀緩?宸倖SQL臥儂?峇佩阻叱肝峯議朴沫荷恬?頁音頁匯化阻隼阻兔。**蒙艶議**?壓`idx_age`屈雫沫哈峯孀欺麼囚`id`朔?指欺id麼囚沫哈朴沫議狛殻,祥各葎指燕。 -> 焚担頁指燕?鎮欺麼囚壅指欺麼囚沫哈臥儂議狛殻?祥出恂**指燕**
+???罩わ??菴?筝?SQL??ヨ哆鐚???ц??篋????罨≧????????膣∽??篏?鐚???壚????壚??罩ヤ????銀????????**??劫????**鐚????`idx_age`篋?膾х刈綣??????上?遺源???`id`???鐚???????id筝脂?勛刈綣????膣∝??菴?腮?,絨援О筝阪??茵????
+> 篁?箙??????茵Ǎ????水?遺源??????????遺源??勛刈綣???ヨ哆???菴?腮?鐚?絨怨û??**???茵?**
 
-### 励、中編郊深泣岻顕固沫哈
+### 篋??????∵??絎??????剛??荀????膣√??
 
-**中編郊?** 泌惚音喘`select *`, 遇頁聞喘`select id,age`?參貧議籾朕峇佩阻叱肝峯朴沫荷恬椿?
+**??∵??絎?鐚?** 絋????筝????`select *`, ?????壚戎???`select id,age`鐚?篁ヤ?????蘂???勖?ц??篋????罨≧?????膣∽??篏??????
 
-**盾裂?** 宸倖諒籾?麼勣深賀昨僉繁議顕固沫哈岑紛泣。指欺`idx_age`沫哈峯?低辛參窟孖臥儂僉?id才age脅壓匐徨准泣貧阻。咀緩?辛參岷俊戻工臥儂潤惚晴?功云祥音俶勣壅指燕阻~
+**茹f??鐚?** 菴?筝??勰??鐚?筝肢?????絲???????篋榊??荀????膣√????ヨ????鴻????????`idx_age`膣√?????鐚?篏??櫆札????ー??ヨ哆???蕁?id???age??遵???嚭???????剛??篋???????罩わ???櫆札??贋・???箴???ヨ哆膸???????????号?サ葦筝????荀???????茵?篋?~
 
 ![](https://p6-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/629b6cfd08614adcbb20154707c0c8e0~tplv-k3u1fbpfcp-watermark.image)
 
-> 顕固沫哈?壓臥儂議方象双戦中?音俶勣指燕肇臥?岷俊貫沫哈双祥嬬函欺?勣議潤惚。算鞘三傍?低SQL喘欺議沫哈双方象?顕固阻臥儂潤惚議双?祥麻貧顕固沫哈阻。
+> 荀????膣√??鐚??????ヨ哆?????井????????????筝????荀????茵??サ??ワ????贋・篁?膣√?????絨沿?遵????井?活?????膸?????????√媺??莚器??篏?SQL?????亥??膣√???????井?卡??荀????篋???ヨ哆膸??????????鐚?絨援??筝?荀????膣√??篋????
 
-侭參?屢斤噐貧倖諒籾?祥頁福肇阻指燕議峯朴沫荷恬。
+???篁ワ????後噲篋?筝?筝??勰??鐚?絨掩?夌???サ篋????茵?????????膣∽??篏????
 
-### 鎗、中編郊深泣岻沫哈払丼
+### ??KK????∵??絎??????剛??膣√??紊掩??
 
-**中編郊?** 泌惚厘孖壓公`name`忖粁紗貧噸宥沫哈?隼朔喘倖like庁冊朴沫?椎氏峇佩謹富肝臥儂椿?SQL泌和?
+**??∵??絎?鐚?** 絋????????ー?????`name`絖?罧球??筝???勰??膣√??鐚???九?????筝?like罔∞?????膣?????d????ц??紊?絨?罨≧?ヨ哆?????SQL絋?筝?鐚?
 ```
-select * from employee where name like '%旬戴%';
+select * from employee where name like '%??遺痔%';
 ```
-**盾裂?** 宸戦深賀議岑紛泣祥頁?like頁倦氏擬崑音恠沫哈?心枠乎SQL議explain峇佩柴皿杏。凪糞like 庁冊朴沫?氏擬崑音恠沫哈議?泌和?
+**茹f??鐚?** 菴???????絲??????ヨ????劫葦??姒??like???????絲取?岩??莎亥刈綣?鐚???????莚?SQL???explain??ц??莅≦????с????九??like 罔∞?????膣???篌?絲取?岩??莎亥刈綣????鐚?絋?筝?鐚?
 
 ![](https://p1-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/3b01bb44ff5744729e55939cc88bd424~tplv-k3u1fbpfcp-watermark.image)
 
-咀緩?宸訳SQL恷朔祥畠燕膝宙晴~晩械蝕窟嶄?宸叱嶽彦荷恬脅辛嬬氏擬崑沫哈払丼?泌和?
-- 臥儂訳周淫根or?辛嬬擬崑沫哈払丼
-- 泌採忖粁窃侏頁忖憲堪?where扮匯協喘哈催凄軟栖?倦夸沫哈払丼
-- like宥塘憲辛嬬擬崑沫哈払丼。
-- 選栽沫哈?臥儂扮議訳周双音頁選栽沫哈嶄議及匯倖双?沫哈払丼。
-- 壓沫哈双貧聞喘mysql議坪崔痕方?沫哈払丼。
-- 斤沫哈双塰麻?泌?+、-、*、/??沫哈払丼。
-- 沫哈忖粁貧聞喘??= 賜宀 <strong>?not in?扮?辛嬬氏擬崑沫哈払丼。
-- 沫哈忖粁貧聞喘is null? is not null?辛嬬擬崑沫哈払丼。
-- 恣銭俊臥儂賜宀嘔銭俊臥儂臥儂購選議忖粁園鷹鯉塀音匯劔?辛嬬擬崑沫哈払丼。
-- mysql浩柴聞喘畠燕膝宙勣曳聞喘沫哈酔,夸音聞喘沫哈。
-
-### 鈍、中編郊深泣選栽沫哈岻恷恣念弸圻夸
-
-**中編郊?** 泌惚厘孖壓公name,age忖粁紗貧選栽沫哈沫哈?參和SQL峇佩謹富肝峯朴沫椿?枠鮫和沫哈峯?
+???罩わ??菴????SQL??????絨怨??;?????????~??ュ幻綣????筝昭和??菴????腱?薨????篏???遵櫝?巡??絲取?雁刈綣?紊掩??鐚?絋?筝?鐚?
+- ??ヨ哆??&gt;散??????or鐚??櫝?遵嚩??雁刈綣?紊掩??
+- 絋?篏?絖?罧窮瓜????????膃?顕鐚?where??銀??絎????綣??垽?セ儀??ワ???????膣√??紊掩??
+- like??????膃?櫝?遵嚩??雁刈綣?紊掩?????
+- ??????膣√??鐚???ヨ哆??句????&gt;散???筝???虁?????膣√??筝下??膃コ??筝???鐚?膣√??紊掩?????
+- ???刈綣????筝?篏睡??mysql??????臀??醇?逸??膣√??紊掩?????
+- 絲合刈綣????菴?膊?鐚?絋?鐚?+???-???*???/鐚?鐚?膣√??紊掩?????
+- 膣√??絖?罧灸??篏睡?Ǎ??鐚?= ?????? <strong>鐚?not in鐚???駈???櫝?巡??絲取?雁刈綣?紊掩?????
+- 膣√??絖?罧灸??篏睡??is null鐚? is not null鐚??櫝?遵嚩??雁刈綣?紊掩?????
+- 綏????・??ヨ哆???????勈???・??ヨ哆??ヨ哆??活?????絖?罧窮???????弱?鋇?筝???件???櫝?遵嚩??雁刈綣?紊掩?????
+- mysql篌域?&gt;戎??????;?????頳?罸?篏睡??刈綣?綽?,???筝?篏睡??刈綣????
+
+### 筝??????∵??絎??????壕?????膣√??箙????綏???膽???????
+
+**??∵??絎?鐚?** 絋????????ー?????name,age絖?罧球??筝???????膣√??膣√??鐚?篁ヤ??SQL??ц??紊?絨?罨≧?????膣√?????????私??膣√?????鐚?
 ```
-select * from employee where name like '弌%' order by age desc;
+select * from employee where name like '絨?%' order by age desc;
 ```
-**盾裂?** 宸戦深賀選栽沫哈議恷恣念弸圻夸參式like頁倦嶄沫哈議岑紛泣。怏栽沫哈峯幣吭夕寄古泌和?
+**茹f??鐚?** 菴???????絲???????膣√????????綏???膽???????篁ュ??like?????賢膣√???????ヨ????鴻??膸????膣√?????腓堺????上ぇ网?絋?筝?鐚?
 
 ![](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/29df075df94549b693a6a0ee06730666~tplv-k3u1fbpfcp-watermark.image)
 
-選栽沫哈?頁枠梓侖兆name貫弌欺寄電會?泌惚兆忖name屢揖?夸梓定槍age貫弌欺寄電會。中編郊勣箔臥侭嗤兆忖及匯倖忖頁^弌 ?議繁?SQL議like '弌%'頁辛參喘貧```idx_name_age```選栽沫哈議。
+??????膣√??蕁号???????紮????name篁?絨???医ぇ???綺??絋???????絖?name??後??鐚???????綛顔??age篁?絨???医ぇ???綺??????∵??絎?荀?羆???ユ????????絖?膃コ??筝?????壎??絨???????篋削??SQL???like '絨?%'???櫆札???筝?```idx_name_age```??????膣√????????
 
 ![](https://p6-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/58b49f88f75f48be873deb395431c2fa~tplv-k3u1fbpfcp-watermark.image)
 
-乎臥儂氏冽彭idx_name_age沫哈峯?孀欺及匯倖忖頁弌議沫哈峙?咀緩卆肝孀欺```弌嘱、弌戴、弌凰、```?蛍艶鎮欺Id=```600、100、700```?隼朔指眉肝燕?肇孀斤哘議芝村。 宸戦中議恷恣念弸```弌```?祥頁忖憲堪沫哈議恷恣M倖忖憲。糞縞貧?
-- 宸倖恷恣念弸辛參頁選栽沫哈議恷恣N倖忖粁。曳泌怏栽沫哈?a,b,c?辛參屢輝噐秀阻?a???a,b?,(a,b,c)眉倖沫哈?寄寄戻互阻沫哈鹸喘嬬薦。
-- 恷恣念弸匆辛參頁忖憲堪沫哈議恷恣M倖忖憲。
+莚ユ?ヨ哆篌?羃睡??idx_name_age膣√?????鐚???上?亥?筝?筝???????????膣√????種?????罩や??罨≧?上??```絨???????絨鋍???絨???????```鐚?????????水??Id=```600???100???700```鐚???九?????筝?罨∴;鐚??サ??上噲綺????莅医????? 菴??????∝?????綏???膽?```絨?```鐚?絨掩????膃?顕膣√????????綏?M筝???膃???絎????筝?鐚?
+- 菴?筝???綏???膽??櫆札??虁?????膣√????????綏?N筝???罧泣??罸?絋?膸????膣√??鐚?a,b,c鐚??櫆札??後??篋?綮坂??鐚?a鐚?鐚?鐚?a,b鐚?,(a,b,c)筝?筝?刈綣?鐚?紊уぇ???蕭?篋?膣√??紊?????遵?????
+- ???綏???膽?箙??櫆札?????膃?顕膣√????????綏?M筝???膃???
 
-### 伊、中編郊深泣岻沫哈和容
+### ???????∵??絎??????剛??膣√??筝??ィ
 
-**中編郊?** 厘断珊頁肖噐怏栽沫哈 idx_name_age?參和宸倖SQL峇佩叱肝峯朴沫椿?
+**??∵??絎?鐚?** ???篁セ???????篋?膸????膣√?? idx_name_age鐚?篁ヤ??菴?筝?SQL??ц?????罨≧?????膣√????
 
 ```
-select * from employee where name like '弌%' and age=28 and sex='0';
+select * from employee where name like '絨?%' and age=28 and sex='0';
 ```
 
-**盾裂?** 宸戦深賀沫哈和容議岑紛泣?泌惚頁**Mysql5.6岻念**?壓idx_name_age沫哈峯?孀竃侭嗤兆忖及匯倖忖頁^弌 ?議繁?鎮欺万断議麼囚id?隼朔指燕孀竃方象佩?壅肇斤曳定槍才來艶吉凪麿忖粁。泌夕?
+**茹f??鐚?** 菴???????絲?膣√??筝??ィ?????ヨ????刻??絋???????**Mysql5.6箙????**鐚????idx_name_age膣√?????鐚???上?堺????????絖?膃コ??筝?????壎??絨???????篋削????水?医??篁ス??筝脂??id鐚???九?????茵???上?堺?井?勤??鐚?????サ絲号??綛顔???????у??????銀??絖?罧泣??絋???常??
 
 ![](https://p6-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/c5729b1a84fd4ee9b872717903ca6f75~tplv-k3u1fbpfcp-watermark.image)
 
-嗤乂涛嗔辛嬬状誼謎講??name,age)音頁選栽沫哈啄?葎焚担僉竃淫根^弌 ?忖朔?音壅乏宴心和定槍age壅指燕椿?音頁厚互丼啄?侭參兔?MySQL 5.6 祥哈秘阻**沫哈和容單晒**?辛參壓沫哈演煽狛殻嶄?斤沫哈嶄淫根議忖粁枠恂登僅?岷俊狛陀渠音諾怎訳周議芝村?受富指燕肝方。
+???篋????????櫝?処??緇?絅??????鐚?name,age)筝???虁?????膣√?????鐚?筝坂??箙??????阪???????絨????絖????鐚?筝????蕁坂梢???筝?綛顔??age??????茵??????筝???壩?顔????????鐚????篁ュ??鐚?MySQL 5.6 絨怨????ヤ??**膣√??筝??ィ篌????**鐚??櫆札???刈綣???????菴?腮?筝昭和??絲合刈綣?筝上???????絖?罧球???????ゆ?昭和????贋・菴?羯ゆ??筝?羯∴恭??&gt;散???莅医??鐚???鎞????茵?罨≧?違??
 
 
-咀緩?MySQL5.6井云岻朔?僉竃淫根^弌 ?忖朔?乏燕狛陀age=28?,侭參祥峪俶匯肝指燕。
+???罩わ??MySQL5.6?????コ?????鐚??????阪???????絨????絖????鐚?蕁肴;菴?羯?age=28鐚?,???篁ュ葦?Ū??筝?罨≦??茵????
 
 ![](https://p6-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/168aecb4709d4c30bc93c489ad76d712~tplv-k3u1fbpfcp-watermark.image)
 
-### 湘、 中編郊深泣岻寄燕耶紗沫哈
+### 箙???? ??∵??絎??????剛??紊ц;羞糸??膣√??
 
-**中編郊?** 泌惚匯嫖燕方象楚雫頁認嵐雫艶參貧議?椎担?公宸嫖燕耶紗沫哈?低俶勣奕担恂椿?
+**??∵??絎?鐚?** 絋????筝?綣?茵???井?勰?靮ф????筝?膾у??札筝????鐚???d??鐚?膸?菴?綣?茵?羞糸??膣√??鐚?篏????荀????箙?????????
 
-**盾裂?** 厘断俶勣岑祇匯泣?公燕耶紗沫哈議扮昨?頁氏斤燕紗迄議。泌惚音女風荷恬?嗤辛嬬竃孖伏恢並絞議。辛參歌深參和圭隈?
+**茹f??鐚?** ???篁ソ??荀???ラ??筝???刻??膸?茵?羞糸??膣√???????九??鐚???壚??絲壕;????????????絋????筝?莪???????篏?鐚?????櫝?遵?榊ー???篋т????????????櫆札??????篁ヤ????号??鐚?
 
-- 1.枠幹秀匯嫖効圻燕A方象潤更屢揖議仟燕B。
-- 2.壓仟燕B耶紗俶勣紗貧議仟沫哈。
-- 3.委圻燕A方象擬欺仟燕B
-- 4.rename仟燕B葎圻燕議燕兆A?圻燕A算艶議燕兆?
+- 1.??????綮坂??綣?莊????茵?A??井?勛???????後???????域;B???
+- 2.?????域;B羞糸?????荀????筝??????亥刈綣????
+- 3.??????茵?A??井??嚩??井?域;B
+- 4.rename??域;B筝阪??茵???茵????A鐚????茵?A??√????茵????鐚?
 
-### 悳潤嚥膳楼
+### ??紫??筝?膸?箙?
 
-云猟麼勣讐盾阻沫哈議9寄購囚岑紛泣?錬李斤寄社嗤逸廁。俊和栖椿?公寄社竃匯祇?嗤購噐厘恷除匍暦蝕窟囑欺議紗沫哈SQL?心和寄社頁奕担指基議?嗤佶箸辛參選狼厘込~籾朕泌和?
+??シ??筝肢??莅画В篋?膣√?????9紊у?渇?勛?ヨ????刻??絽????絲劫ぇ絎倶??絽??í???・筝???ュ????膸?紊у侔??坂?????鐚??????割????????菴?筝???≦??????????亥?????膣√??SQL鐚????筝?紊у侔??壩??箙????膈????鐚??????頑僑?櫆札???膤紙?????~蘂??????筝?鐚?
 ```
 
 select * from A where type ='1' and status ='s' order by create_time desc;
 ```
-邪譜type嗤9嶽窃侏?曝蛍業來珊麻辛參?status議曝蛍業音互?嗤3嶽窃侏??椎担低頁泌採紗沫哈椿?
-- 頁公type紗汽沫哈
-- 珊頁?type?status?create_time?選栽沫哈
-- 珊頁?type?create_time?選栽沫哈椿?
-
-### 歌心嚥湖仍
-- [ MySQL嗤陳乂沫哈窃侏 ?](https://segmentfault.com/q/1010000003832312)
-- [寄燕紗沫哈圭宛](https://zhuanlan.zhihu.com/p/151460679)
-- [MySQL糞媾45讐](https://time.geekbang.org/column/article/69636)
+???莅?type???9腱?膠糸??鐚???阪??綺??ц??膊??櫆札鐚?status?????阪??綺???蕭?鐚????3腱?膠糸??鐚?鐚???d??篏??????篏????膣√???????
+- ??夌??type??????膣√??
+- 菴???姒??type鐚?status鐚?create_time鐚???????膣√??
+- 菴???姒??type鐚?create_time鐚???????膣√???????
+
+### ??????筝????莪?
+- [ MySQL?????ŭ??膣√??膠糸?? ?](https://segmentfault.com/q/1010000003832312)
+- [紊ц;???膣√????号??](https://zhuanlan.zhihu.com/p/151460679)
+- [MySQL絎????45莅?](https://time.geekbang.org/column/article/69636)
 
diff --git "a/347円250円213円345円272円217円344円272円272円347円224円237円&351円235円242円350円257円225円345円273円272円350円256円256円/351円207円221円344円270円211円351円223円266円345円233円233円357円274円214円347円273円231円351円235円242円350円257円225円350円200円205円347円232円204円345円215円201円345円244円247円345円273円272円350円256円256円.md" "b/347円250円213円345円272円217円344円272円272円347円224円237円&351円235円242円350円257円225円345円273円272円350円256円256円/351円207円221円344円270円211円351円223円266円345円233円233円357円274円214円347円273円231円351円235円242円350円257円225円350円200円205円347円232円204円345円215円201円345円244円247円345円273円272円350円256円256円.md"
index 6909f79..79673b9 100644
--- "a/347円250円213円345円272円217円344円272円272円347円224円237円&351円235円242円350円257円225円345円273円272円350円256円256円/351円207円221円344円270円211円351円223円266円345円233円233円357円274円214円347円273円231円351円235円242円350円257円225円350円200円205円347円232円204円345円215円201円345円244円247円345円273円272円350円256円256円.md"
+++ "b/347円250円213円345円272円217円344円272円272円347円224円237円&351円235円242円350円257円225円345円273円272円350円256円256円/351円207円221円344円270円211円351円223円266円345円233円233円357円274円214円347円273円231円351円235円242円350円257円225円350円200円205円347円232円204円345円215円201円345円244円247円345円273円272円350円256円256円.md"
@@ -1,4 +1,5 @@
 ### 筝??????????紊?箙?絅巡?????筝?筝???ヨ??
+
 筝?筝???ヨ????壩??筝咲??荀????筝???刻????ユ??篋????絎????筝?筝???榊??鐚?篏??????処??????????????綵弱恩???
 
 ???罩わ????∵??箙????鐚?筝?絎?筝?絎?荀?紊?箙?絅巡??筝???ヨ?????絲壕??訓絖????????ヨ??鐚?荀????筝?筝?????ロ????上????羌隙賢?????銀??薀上??鐚?紊?箙?筝?筝?鐚??????育?鋐睡????遺???????榊??蘂???卡??綽?筝右?処?醇??筝???罅????
@@ -9,6 +10,7 @@
 ![](https://user-gold-cdn.xitu.io/2020/2/14/17043f9e65f6c1a2?w=1919&h=1080&f=png&s=1153224)
 
 ### 篋????絲合?????筝???????蕁合?勌??絎?荀?莇喝??篋?茹o??????偦?銀賢???篋勛?鴻??
+
 篏?????????筝????篆≧?姒??絨掩?奝?∵??絎?篋?茹d?????腦??叵??篏????筝??サ???蕁合?卡?????訓筝?絎?筝?絎?荀?篋?茹f??罐???ラ???サ??????絋??????????査緇????絎括??蕁合??copy筝??サ鐚???∵??絎?筝???勌??筝?筝???ワ????e葦??臥?????~
 
 ?????駈??膊????筝????荀?羃?羞?筝?篋???????絎合??筝?茱随?????荀????篋?篋勛?鴻??綵???駈??膊????筝????篋勛?劫攻筝?筝?絎???奝????睡?上拘???絅喝?睡頃鐚?箙??櫆札??壚?????訓???????壕???翠????榊??膠渇??鐚??Ű?????篏?羆?羂雁????渇??篏??ー???????√葦?櫆札?????
@@ -19,8 +21,8 @@
 
 [CAS箙?茹????茹e?喝攻?????勰?????筝?罨≦??莊?](https://juejin.im/post/5d0616ade51d457756536791)
 
-
 ### 筝??????∵??筝?絎?荀????膸?菴?綺?冠綣?鐚?荀?綽?綛恰??????サ絲劫?????
+
 ??∵??菴?腮?筝?絎?荀????膸?菴?綺?冠綣?鐚?膣у???櫝?巡??絲取?岩???????ュけ絽醐??莅î????榊???????勰????遵??篋????箙????膈?鐚???????筝???????offer紊延??篋よ?????
 
 ?????劫?靘у??箙????櫆札?・??????鐚?菴?筝???剛??篆?篏推??莅ょ????医??紊?鐚?篏???虁??綺?冠綣?絨演??緇???九???????
@@ -29,7 +31,9 @@
 
 綛恰?九?????茹?緇????羇糸?????鐚???????膣у?????莚?鐚????篌?綣劫執???篁?鐚???怨?掩??鐚???????
 ![](https://user-gold-cdn.xitu.io/2020/2/14/17043f1531a9fc6e?w=1080&h=2248&f=png&s=580499)
+
 ### ????????∵???????????篋?茹e?サ夓札???綏ヤ??絏?篏????絎?
+
 ??∵?????鐚?紊???剛??茹e?サ虁????篁?箙?筝???∞??鐚?篁ュ??綏ヤ??絏?篏????筝肢??綏ヤ?????絎鴻??膸??????????荀?羆?鐚?????????割??筝???∵??絎??櫝?初?勛????勰??鐚???≫????????篁ュ??綮銀叱?????????罸?絋?鐚?篏???∝????壚????顔?区?????綣????絏?鐚?莚ラ?区???????域???????MQ???莅姒????d??鐚?篏????荀????紊?絅?https??後?括????∵??蘂?鐚?羔???壚賢??岩散?????後?渇?∵??蘂?膈?膈????
 
 絋?鐚?https????????壚??箙?鐚?莪?莪?RocketMQ羔???奝〆綺???????紊?羔?茣拷?勰??膈????
@@ -50,7 +54,6 @@
 絋????篏?荀???≫??筝?ぇ???鐚????莅よ?????篋阪???ィ???絅巡??菴????????九??????ィ菴?緇?网????紊у??紊??????????筝削??紊у侔??醇??筝?筝??????鐚?篌?腱????篋堺??莨刻??箙???壚??篋?篌?腱????篋削??罩f??莪?**??î札膠肢??鐚?篋坂札臂ゅ??**???
 ???篁ワ??紊????HR箙???虁????傑??篋榊??鐚?絋????篏????菴?????ィ?キ緇???∵????坂??鐚?絅遵ソ茵?ー??э??薨?綛眼??
 
-
 ![](https://user-gold-cdn.xitu.io/2020/2/14/1704426243d9ab07?w=255&h=255&f=png&s=104800)
 
 ### 筝???????綏ヤ????銀????剛??絖?腱夌姦鐚?????∵????駈??筝?絖?筝?莚?茵?ー???
@@ -60,15 +63,19 @@
 罸?絋?鐚?筝?筝???壩??綏ヤ??筝TEL撮???膸?????????紫??鐚??????頑僑?櫆札?????????~
 
 [???篁g?????菴?篋???恰??鐚????篋????筝?篌?莅や減篏????????句??茣雁??綺????](https://juejin.im/post/5dfe2e72518825125f39a2de)
+
 ### ???????∵??絨初????水?????筝?offer鐚?菴???傑????醇???偣源??????鐚?筝????HR?櫝?巡?????网?篏????
+
 ??∵????上轡篏?鐚?絲劫??offer??????荀???????腆???????鐚???????????????????荀?筝???駈??絋????篏??Ŭ??筝?筝?offer鐚?HR莊?篏?莪????????九??鐚?緇??櫝?巡?????网?篏????篁桁?若????水?????筝?offer鐚??櫆札???莪??????莎???ケ??
 
 ![](https://user-gold-cdn.xitu.io/2020/2/14/1704423b8e7982ac?w=800&h=450&f=png&s=613615)
 
 ### 箙????紊???劫?隙??筝?膃?莚?蘂?鐚?腮?綺???????莚?鐚?篋???????筝?leetcode???絽後????
+
 ??翠???????乗佉???紊贋?∴??篋???サ夵????∵??膸鎵梧??羆??????????膽?腮?蘂?鐚????篁ワ??篏?筝咲?∵?????鐚?荀???活????鰹??筝?絎????荀?紊???劫?潔??鐚?絨ゅ?倶??leetcode絎?臀?筝???∝??蘂?鐚?筝?羆?罸????蘂???処?処??筝???ワ??篏???虁?喝??鐚?罸霡?膠糸?????蘂???卡??篏???初??荀???ラ?????莊姒?????荀???ラ??紊ф?????箙?絎??ー??э??絋?鐚???????茹??????勰???????乗;???篏?膈?膈????
 
 ### ??????絖???筝????箙???Ǎ????????筝?蕁壕????????
+
 絖???筝????箙???Ǎ????壚減篋?莅ñ??羇糸??筝?篁処????????????筝?蕁壕????Ǎ????壚減篋?荳?????ュ嵯???
 
 絖???筝????箙???Ǎ??????∵??絎??????ヤ???????????鐚????筝阪拘篌??櫆札筝??サ茵?羲???????~ ??????筝?蕁壕????Ǎ??箙????????????鐚????筝坂????サ?サ夣?醇??菴????絨靳?鐚?膀勛??絨靳?鐚???????臂醇?????鐚?絋??????∵??絎?箙?莊?篏?筝???欠?怨ソ膀勛??鐚?莚岩??絎?鐚?篏?篁サ葦?櫆札??????篁?綛贋??篋堺?糸?????篋?鐚??????????綛銀??鐚?菴??????篋堺????喝?????????????鐚?筝?篆&gt;????????~
diff --git "a/350円214円266円344円275円231円351円245円255円345円220円216円350円260円210円347円274円226円347円250円213円345円255円246円344円271円240円345円221円250円346円212円245円/350円214円266円344円275円231円351円245円255円345円220円216円347円274円226円347円250円213円345円221円250円346円212円245円344円272円214円.md" "b/350円214円266円344円275円231円351円245円255円345円220円216円350円260円210円347円274円226円347円250円213円345円255円246円344円271円240円345円221円250円346円212円245円/350円214円266円344円275円231円351円245円255円345円220円216円347円274円226円347円250円213円345円221円250円346円212円245円344円272円214円.md"
index b5bb492..82e3b5a 100644
--- "a/350円214円266円344円275円231円351円245円255円345円220円216円350円260円210円347円274円226円347円250円213円345円255円246円344円271円240円345円221円250円346円212円245円/350円214円266円344円275円231円351円245円255円345円220円216円347円274円226円347円250円213円345円221円250円346円212円245円344円272円214円.md"
+++ "b/350円214円266円344円275円231円351円245円255円345円220円216円350円260円210円347円274円226円347円250円213円345円255円246円344円271円240円345円221円250円346円212円245円/350円214円266円344円275円231円351円245円255円345円220円216円347円274円226円347円250円213円345円221円250円346円212円245円344円272円214円.md"
@@ -4,6 +4,7 @@
 綵?qps???1000?????九??鐚???延??筝?筝?噯羆???????荀???????筝?罨≦サ莚傑??筝????????・????絨援?後??篋????3000筝???????・????莚傑????? 篏???虁噯羆?????????????倶・????絋????莚ユ・????綺?緇???∽??絋?10腱????鐚???d??菴?147筝?鎖腮?絨怨???????莎隙??鐚?羃≧??腥坂?????膾睡???サ紊??????亥??筝???&gt;???????岩肩膤紫????????綺?絨演??絽御?≫?????
 
 臂や?????紊?膈?罅?鐚?
+
> - ???綺?緇???∝???・?呃軌綣?罩ワ?????菴?????????井?勌権???queue?????≪??
> - 綺?莚ユ??10腱?????・???????
> - ?・?吨?≫?????莚?鐚????筝???巡????順??redis 
@@ -14,14 +15,12 @@
 
 ![](https://imgkr2.cn-bj.ufileos.com/5f138381-05f3-4aa2-a344-98e8b970a920.png?UCloudPublicKey=TOKEN_8d8b72be-579a-4e83-bfd0-5f6ce1546f13&Signature=yJuf5adRW5I%252BSl3%252FWX1oyVr9%252Ffo%253D&Expires=1603008626)
 
-
 ??九??鐚?絋????罸鋇?噯羆?30罸???紊????絎?鐚??櫝?巡?????膾睡??羆?箙?紊????篋????篏????????絋????篏?筝?筝?噯羆?鐚??・???????10s鐚?箙?絨掩?虁?10腱?鐚?絎?羃≦慌絎?羇誌??羃≧???・?????羇誌???????膤紫??絨怨?????筝?菴???ラ?d??紊?莚傑??????????篁ユ?????膸????絨掩?姒??筝???????莚傑??絨延?????綣?鐚????筝榊鎖腮?羆????綣?膈???ユ??綣?????????菴?紊器??篏????膤紫?????綺??????絨掩?壚??????・?呃????狗?勰?????鐚?篏????荀?篌????絎????
 
 ?櫆札???筝????菴?筝ょ?????腴????膾睡??羆????絋?篏??・?吨?ц?巡????????~
 
-
-
 ??割??膾睡??羆?????・?吨?ц?巡????????鐚??櫆札???筝????箙????菴?筝ょ?????腴????
+
 - [??∵??綽?紊?鐚?Java膾睡??羆?茹f??](https://mp.weixin.qq.com/s?__biz=MzIwOTE2MzU4NA==&mid=2247483728&idx=1&sn=0221dfd5eb7862c0aa749a7038b39307&chksm=9779457fa00ecc69d3bb554ccc1daa8aa204b16b15587759cf1f148bda51907f6f57418e150f&token=1319249232&lang=zh_CN#rd)
 
 - [莅遺??罨≧・?吨?ц?巡?????絎?莊究?紫??鐚?篌?????・?吨?ц?順?????肩綮肴佈](https://mp.weixin.qq.com/s?__biz=MzIwOTE2MzU4NA==&mid=2247484426&idx=1&sn=7265be5a5c37e71e65a2e42c999d3f72&chksm=97794025a00ec93379ad537353dd58f9149f801e100786a2b9c8cf37257e6d863d7ce4b87a5e&token=1319249232&lang=zh_CN#rd)
\ No newline at end of file
</div><div class="naked_ctrl">
<form action="/index.cgi/contrast" method="get" name="gate">
<p><a href="http://altstyle.alfasado.net">AltStyle</a> によって変換されたページ <a href="https://github.com/whx123/JavaHome/compare/master...billyle:JavaHome:master.diff">(-&gt;オリジナル)</a>
/ <label>アドレス: <input type="text" name="naked_post_url" value="https://github.com/whx123/JavaHome/compare/master...billyle:JavaHome:master.diff" size="22" /></label> <label>モード: <select name="naked_post_mode">
<option value="default">デフォルト</option>
<option value="speech">音声ブラウザ</option>
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<option value="larger-text">文字拡大</option>
<option value="mobile">モバイル</option>
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<input type="submit" value="表示" />
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