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Update ch5.md #147

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Dec 7, 2021
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Update ch5.md #147

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2 changes: 1 addition & 1 deletion ch5.md
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#### 从库失效：追赶恢复

在其本地磁盘上，每个从库记录从主库收到的数据变更。如果从库崩溃并重新启动，或者，如果主库和从库之间的网络暂时中断，则比较容易恢复：从库可以从日志中知道，在发生故障之前处理的最后一个事务。因此，从库可以连接到主库，并请求在从库断开连接时发生的所有数据变更。当应用完所有这些变化后，它就赶上了主库，并可以像以前一样继续接收数据变更流。
在其本地磁盘上，每个从库记录从主库收到的数据变更。如果从库崩溃并重新启动，或者，如果主库和从库之间的网络暂时中断，则比较容易恢复：从库可以从日志中知道，在发生故障之前处理的最后一个事务。因此，从库可以连接到主库，并请求在从库断开期间发生的所有数据变更。当应用完所有这些变化后，它就赶上了主库，并可以像以前一样继续接收数据变更流。

#### 主库失效：故障切换

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