向前写日志系统需要稳定存储。

Write-ahead log scheme requires stable storage.

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进程检查点机制是在进程正常运行的适当时刻设置检查点，将进程状态保存到稳定存储器中。

Checkpoint facility enables the intermediate state of a running process to be saved to stable storage.

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Synchronous(同步)(零数据丢失)-主服务器进行提交之前，要先将日志数据写入备用服务器中的稳定存储器。

Synchronous (zero data loss) - the log data is flushed to stable storage at the standby before committing on the primary.

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