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MySQL InnoDB redo Log 浅析-王伟

 5 years ago
source link: http://blog.51cto.com/wangwei007/2287431
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MySQL的InnoDB存储引引擎的物理文件存储体系中,除了实际的数据文件(ibd,ibdata)之外,还有两个非常重要的日志系统,分别是redo日志和undo日志。跟Oracle类似,redolog记录了对实际数据文件的物理变更(数据文件的什么位置数据做了如何的变更)。InnoDB也是采用了WAL(日志优先落盘),也就是说在实际数据文件的修改落盘之前redo日志已经落盘,从而来保证事务的持久性。

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