当您需要在不重新构建数据的测试或灾难恢复系统上刷新数据时，这种方法很方便。
This can be handy when you want to refresh data on a test or disaster recovery system that doesn't need to be built from scratch.
在应急恢复中，把提交的数据刷新到磁盘时，将回滚没有提交的事务。
In crash recovery, transactions that are not committed will be rolled back while committed data will be flushed to disk.
当我重新连接时，一切在几秒内恢复了正常，我的Gmail收件箱也已经刷新。
When I reconnected, everything turned back on in a few seconds and my Gmail inbox refreshed.
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