有了这个紧急维护空间，就可以利用它对一块已满的磁盘进行恢复。

That emergency maintenance space is there so it can be used to recover from an overfull disk.

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崩溃恢复是对日志文件进行处理，确保所有已提交的事务被写到磁盘，所有未提交的事务被回滚。

Crash recovery is the processing of the log files, making sure all committed transactions are written to disk and uncommitted transactions are rolled back.

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另外还使用一个小磁盘进行自动内部集群恢复。

Another small disk will be leveraged for automatic internal cluster recovery purposes.

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