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.
因为仅在将数据刷新到磁盘时获得锁，所以性能并不会受到很大的影响。
Since the lock is acquired only while flushing data to disk, performance is not extensively affected.
缓冲池——在将数据刷新到磁盘之前，为存储数据而分配的内存。
Buffer Pool - Memory allocated to store data before flushing it to disks.
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