的确出现故障时，在故障出现前未写出的数据可能会丢失，并不会因为服务器使用数据库还是DRS持久性解决方案而有所差别。
When a failure does occur, data that has not been written out before the failure occurred might be lost, regardless of whether the server is using database or DRS persistence.
非持久化的消息是在内存中进行处理的，速度很快，但可能会因系统故障而丢失消息。
Non-persistent messages are processed in memory and are very fast, but may be lost in the event of a system failure.
写事务要求提交的数据库更改被持久化，即使出现故障时也是如此。
Write transactions require that committed database changes be persisted even in the event of a failure.
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