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fix: 删除多余文字 #926

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Snailclimb merged 1 commit into from
Sep 13, 2020
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fix: 删除多余文字 #926

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2 changes: 1 addition & 1 deletion docs/database/Redis/redis-all.md
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Expand Up @@ -462,7 +462,7 @@ typedef struct redisDb {
常用的过期数据的删除策略就两个（重要！自己造缓存轮子的时候需要格外考虑的东西）：

1. **惰性删除** ：只会在取出key的时候才对数据进行过期检查。这样对CPU最友好，但是可能会造成太多过期 key 没有被删除。
2. **定期删除** ： 每隔一段时间抽取一批 key 执行删除过期key操作。并且，Redis 底层会并通过限制删除操作执行的时长和频率来减少删除操作对CPU时间的影响。
2. **定期删除** ： 每隔一段时间抽取一批 key 执行删除过期key操作。并且，Redis 底层会通过限制删除操作执行的时长和频率来减少删除操作对CPU时间的影响。

定期删除对内存更加友好，惰性删除对CPU更加友好。两者各有千秋，所以Redis 采用的是 **定期删除+惰性/懒汉式删除** 。

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