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Update Redis.md

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`@@ -251,6 +251,11 @@ Redis 通过 MULTI、EXEC、WATCH 等命令来实现事务(transaction)功能。`
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`252`	`252`	`在传统的关系式数据库中,常常用 ACID 性质来检验事务功能的可靠性和安全性。在 Redis 中,事务总是具有原子性(Atomicity)、一致性(Consistency)和隔离性(Isolation),并且当 Redis 运行在某种特定的持久化模式下时,事务也具有持久性(Durability)。`
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	`254`	`+补充内容:`
	`255`	`+`
	`256`	`+> 1. redis同一个事务中如果有一条命令执行失败,其后的命令仍然会被执行,没有回滚。(来自[issue:关于Redis事务不是原子性问题](https://github.com/Snailclimb/JavaGuide/issues/452) )`
	`257`	`+> 2.`
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`254`	`259`	`### 缓存雪崩和缓存穿透问题解决方案`
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`256`	`261`	`缓存雪崩`

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