改变在线重做日志文件大小和数量有时是优化数据库。

Changing the size and number of the online redo log files is sometimes done to tune the database.

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保存在线重做日志文件组的多个成员来保证重做日志不丢失。

Maintaining multiple members of an online redo log group protects against the loss of the redo log.

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你可以在主库添加或删除在线重做日志组或者日志成员而不影响备库。

You can add or drop online redo log file groups or members to the primary database without affecting the standby database.

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