（3）事务日志备份（Transaction Log Backup）：事务日志是对数据库发生的事务进行备份包括从上次事务日志备份、差异备份和完全数据库备份后，数据库已经执行完成的所有事务它...
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However, sometimes a transaction log backup is larger than a full backup.
不过，有时事务日志备份要比完全备份还大。
Transaction log backup — Backs up all of the transactions performed against the database after the last successful full backup or transaction log backup is completed.
事务日志备份——备份所有执行的事务日志(在上次完全备份之后执行的)。
Then if a system or media failure occurs, you can use the transaction log and a third-party backup utility to recover your database.
如果系统或媒体发生失败，您可以使用事务日志和第三方备份实用工具恢复数据库。
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