多亏了日志，数百G的文件系统元数据几乎能在瞬间恢复到一致性的状态。

Thanks to the journal, hundreds of Gigabytes of filesystem meta-data can be brought to a consistent state almost instantaneously.

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在这个更新过程中，可能由于某种故障(如网络)使数据库处于不一致状态，这时，我们必须通过某种恢复机制来恢复数据库的一致性。

During updating, database may be inconsistent because of some error, for example network error, so we must recover it by the recovery mechanism of the DDES.

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为了能在数据库系统发生故障之后将数据库恢复到一个一致性的状态，恢复子系统需要进行记日志、做检验点、备份和故障后重装等活动。

Recovery activities like logging, checkpointing, backup and reloading are used to restore the database to a consistent state after a system crash has occurred.

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