清单3：从备份恢复salesdb数据库。

Listing 3: Restoring the salesdb database from backup.

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清单4：从备份恢复salesdb数据库并将事务日志放在不同的位置。

Listing 4: Restoring the salesdb database from a backup and placing the transaction log in different location.

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它们通常提供了最基本的单用户环境，您可以使用这个环境进行磁盘检查(fsck)、系统安全漏洞检查，或者从备份恢复受损的文件。

These almost always provide a minimal single-user environment that you can use to run disk checks (FSCK), check for system compromises, or restore damaged files from backup.

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