Perform logical database backups as they extract data and logical definitions from the database to a file.

执行逻辑数据库备份，将数据和逻辑定义从数据库提取到一个文件。

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Backing up your logical logs is always a good idea and it is essential if you plan to do parallel backups or want to be able to perform point-in-time restores (see Type of backups).

备份逻辑日志一直是一个好主意，如果计划执行并行备份或想要执行指定到某一点的还原请参阅备份的类型，那么备份日志非常重要。

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However, in the case of a restore, you won't be able to get your data back because the logical logs are needed to reach a point of consistency for backups performed in parallel mode.

不过，在进行这种情况的还原时，无法使数据还原，因为需要逻辑日志来达到并行模式下执行的备份的某个一致点。

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