oracle Redo Logs

The redo log records all changes made to data, including both uncommitted and committed changes. Oracle通过Redo来保证数据库的事务可以被重演，从而使得在故障之后，数据可以被恢复。在数据库中，Redo的功能主要通过3个组件来实现：Redo Log Buffer、LGWR后台进程和Redo Log

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