脱机备份是正常关闭数据库之后，对所有物理数据库文件执行的备份。
Offline backup is the backup of all the physical database files after a normal database shutdown.
在正常模式中关闭数据库。
通过这种方式关闭数据库，可以保证所有事务都将被正常关闭。
By shutting down the database in this manner, you guarantee that all transactions are closed properly.
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