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Redis的持久化--RDB的工作原理及引发的问题

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Release： 2016-06-07 16:07:51
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Redis持久化RDB模式，Redis借助了fork命令的copy on write机制。在生成快照时，将当前进程整个复制出来，fork出一个子进程，然后

Redis持久化RDB模式的工作原理：

Redis持久化RDB模式，Redis借助了fork命令的copy on write机制。在生成快照时，将当前进程整个复制出来，fork出一个子进程，然后在子进程中循环所有的数据，将数据写成为RDB文件。

Redis持久化RDB模式引发的问题：

RDB模式需要Redis服务所占内存的1倍的内存

例如一台机器总共16G内存，用了10G内存做Redis服务，假如这10G内存都占满了

这时运行save命令，这时会把10G的进程再复制一遍，变成20G，超过了16G就产生交换，，

如果虚拟内存设置了为4G，这样save也能完成，由于引发大量的交换，会很慢；

如果虚拟内存设置了小于4G，这时Redis就会崩溃，而且数据也不会完整的保存到快照文件中，

重新启动，就会发现数据已经丢失了很多。

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Redis 的详细介绍：请点这里
Redis 的下载地址：请点这里

本文永久更新链接地址：

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Redis持久化 Redis的持久化--RDB的工作原理及引
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