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Commit 44f3e73

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[feat 06-21 aobing] big change
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‎README.md

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[枚举](https://mp.weixin.qq.com/s/U5FkL9zyzr0PkAp8MJJ8BQ)
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[从String中移除空白字符的多种方式!?差别竟然这么大!](https://mp.weixin.qq.com/s/Du2huBEkI7IR3noPeK_67g)
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[双亲委派原则](https://mp.weixin.qq.com/s/6nJ-6cDLW6TfysWV5ZB3Iw)
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[Java 16 新特征,真香!](https://mp.weixin.qq.com/s/-NQoKpBTXwGUxd2hUbCU2Q)

‎docs/all/db/MySQL基础知识.md

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[国庆肝了8天整整2W字的数据库知识点](https://mp.weixin.qq.com/s/J3kCOJwyv2nzvI0_X0tlnA)
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[MySQL大表怎么DDL变更](https://mp.weixin.qq.com/s/pinOFeF09orQCnIp4L6XyA)
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[MySql主从复制,从原理到实践!](https://mp.weixin.qq.com/s/eEWMSTAUF1H-gFBx26jujw)
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[MySQL查询缓存](https://mp.weixin.qq.com/s/LZBctWNWi3qehb-dgUCmxQ)
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[MySQL 的 InnoDB 存储引擎是怎么设计的?](https://mp.weixin.qq.com/s/wr2gJGQSA8QH_lmPh1XOkw)
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[你怎么连模糊匹配like %%怎么优化都不知道](https://mp.weixin.qq.com/s/ygvuP35B_sJAlBHuuEJhfg)
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[数据库基础知识](https://mp.weixin.qq.com/s/NDL1Q6nqdPq5oMBWSpq4ug)
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[MySQL面试夺命20问](https://mp.weixin.qq.com/s/vwHkXGNCdRdx8k7BeBMy9w)
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[mysql 的一行记录是怎么存储的?](https://mp.weixin.qq.com/s/3d66-yXVZoDFRG1wyRw7kA)
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[MySQL的性能到底有多强?](https://mp.weixin.qq.com/s/Chsfldp_BUNOFFCoCPN-ZQ)
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[MySql 35卷](https://mp.weixin.qq.com/s/MaVYENapeJcLNpYcR7tqBQ)
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[为什么 MySQL 喜欢 B+ 树?](https://mp.weixin.qq.com/s/AoPq8poENF9T4mVS1fDFPw)
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[MySQL安全方案](https://mp.weixin.qq.com/s/rQDitOOnLpLEoj8M11NHwg)
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[数据库连接池到底应该设多大?这篇文章可能会颠覆你的认知](https://mp.weixin.qq.com/s/dQFSrXEmgBMh1PW835rlwQ)
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[数据库设计](https://mp.weixin.qq.com/s/yo_LJ6IwGnjiBXSA7ZHdOA)
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[漫话:如何给女朋友解释什么是撞库、脱库和洗库?](https://mp.weixin.qq.com/s/L0XUMHInnwN9gSYGH2nzdg)
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[MVCC和事务隔离级别的关系](https://mp.weixin.qq.com/s/0-YEqTMd0OaIhW99WqavgQ)
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[MySQL事务与MVCC如何实现的隔离级别](https://mp.weixin.qq.com/s/CZHuGT4sKs_QHD_bv3BfAQ)
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[数据库事务](https://mp.weixin.qq.com/s/iFmvvt4DJ-_qFeb0XUh6QA)
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[MySQL 默认隔离级别是RR,为什么阿里等大厂会改成RC?](https://mp.weixin.qq.com/s/mIz0T0v68_dvUgCrj-qdug)

‎docs/all/db/分库分表.md

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[我们为什么要分库分表?](https://mp.weixin.qq.com/s/-Jipxjwe-jAax4hJSe-9Jg)
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[分库分表方案](https://mp.weixin.qq.com/s/dMqXBW6W8DeqfAPvko3ViQ)

‎docs/all/db/数据库性能调优.md

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[为什么MySQL不建议使用delete删除数据?](https://mp.weixin.qq.com/s/7dpNkLaglIyb_9DKdH43eQ)
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[工作以来总结的大厂SQL调优姿势](https://mp.weixin.qq.com/s/nEmN4S9JOTVGj5IHyfNtCw)
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[为啥阿里巴巴不建议MySQL使用Text类型?](https://mp.weixin.qq.com/s/oVjm_iLvbkximBjHv9d8ig)
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[用对了这些场景下的索引,技术总监夸我棒](https://mp.weixin.qq.com/s/-gmAPfiKMNJgHhIZqR2C4A)
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[MySQL索引凭什么让查询效率提高这么多?](https://mp.weixin.qq.com/s/qESZSzHoxUKQRJhb1EQA_Q)
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[MySQL调优](https://mp.weixin.qq.com/s/e0CqJG2-PCDgKLjQfh02tw)

‎docs/all/db/数据库面试题.md

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[innodb是如何插入数据的?](https://mp.weixin.qq.com/s/SqSPxSRslkjUcDasBHGRSQ)
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[数据库自增ID用完了会怎么样?](https://mp.weixin.qq.com/s/qEA1pC2pfh3xz9HuM8iIBg)
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[阿里面试:说说一致性读实现原理?](https://mp.weixin.qq.com/s/qHzb6oPrrbAPoIlfLJVNAg)
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[我说 SELECT COUNT(*) 会造成全表扫描,面试官让我回去等通知](https://mp.weixin.qq.com/s/SNRvdmyS57oWS_CyYKVvSA)
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[原来MySQL面试还会问这些(undo log)](https://mp.weixin.qq.com/s/Lx4TNPLQzYaknR7D3gmOmQ)
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[explain](https://mp.weixin.qq.com/s/izOKK9Ft5wLts8hWIo4ODQ)
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[你说说一条更新SQL的执行过程?](https://mp.weixin.qq.com/s/-5N6eg1yMBUvDMbJOXp0eg)
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[一条SQL语句执行得很慢的原因有哪些?](https://mp.weixin.qq.com/s/YKmFEtHcZPBn1S9so0kxYw)
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[数据库的锁,到底锁的是什么?](https://mp.weixin.qq.com/s/mvG0wVr2kpbM8iqfZnimiQ)

‎docs/all/db/索引、锁机制.md

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[数据库索引](https://mp.weixin.qq.com/s/_9rDde9wRYoZeh07EASNQQ)
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[一口气搞懂MySQL索引所有知识点](https://mp.weixin.qq.com/s/faOaXRQM8p0kwseSHaMCbg)
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[你都是如何设计索引的?](https://mp.weixin.qq.com/s/fShA7jxjshKyHEHfVDrLVA)
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[MySQL的索引是怎么加速查询的?](https://mp.weixin.qq.com/s/7TPVOT7sloDUKmhldf9uvg)
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[索引下推](https://mp.weixin.qq.com/s/87qsrj-_hG54uxcOlFr35Q)
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[MySQL 的全局锁、表锁和行锁](https://mp.weixin.qq.com/s/1LGJjbx_n_cvZndjM3R8mQ)
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[聊聊索引失效?](https://mp.weixin.qq.com/s/WnO_4SoEL6jugkxPHW4KCg)
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[垃圾回收底层原理](https://mp.weixin.qq.com/s/nY6vL5MlUXY1lfnIvNHMnw)

‎docs/all/jvm/垃圾回收机制.md

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[看完这篇垃圾回收,和面试官扯皮没问题了](https://mp.weixin.qq.com/s/_AKQs-xXDHlk84HbwKUzOw)

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