As may be clear later, the database doesn't actually have to write the do, Undo, and state records to its log just yet, although it might.
稍后就会清楚，实际上数据库也不需要马上把do、Undo、和状态记录写入它的日志，尽管可以这么做。
Database-2 writes Undo and do records and state to its recovery log, again just as Database-1 did.
Database - 2把Undo和do记录及状态写入它的恢复日志，再次像Database - 1做的一样。
In the event of a system failure, transaction log recovery can apply or undo only those transactions not written to disk at the time of the failure.
在系统失败时，事务日志可以应用或取消失败时没有写入磁盘的那些事务。
The transaction log records the start of each transaction, the changes to the data, and, if necessary, enough information to undo the modifications made during that transaction.
事务日志记录每个事务的启动、数据更改，必要时还记录用于撤消在该事务中所做修改的足够信息。
The transaction log records the start of each transaction, the changes to the data, and, if necessary, enough information to undo the modifications made during that transaction.
事务日志记录每个事务的启动、数据更改，必要时还记录用于撤消在该事务中所做修改的足够信息。
应用推荐