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supplement on redis persistence mechanism in version 4.0 #30

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Snailclimb merged 1 commit into from
Sep 26, 2018
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supplement on redis persistence mechanism in version 4.0 #30

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5 changes: 5 additions & 0 deletions 数据存储/Redis/Redis持久化.md
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Expand Up @@ -104,6 +104,11 @@ auto-aof-rewrite-min-size 64mb

随着负载量的上升，或者数据的完整性变得 越来越重要时，用户可能需要使用到复制特性。

## Redis 4.0 对于持久化机制的优化
Redis 4.0 开始支持 RDB 和 AOF 的混合持久化（默认关闭，可以通过配置项 `aof-use-rdb-preamble` 开启）。

如果把混合持久化打开，AOF 重写的时候就直接把 RDB 的内容写到 AOF 文件开头。这样做的好处是可以结合 RDB 和 AOF 的优点, 快速加载同时避免丢失过多的数据。当然缺点也是有的， AOF 里面的 RDB 部分就是压缩格式不再是 AOF 格式，可读性较差。

参考：

《Redis实战》
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