Creates the online redo log files if they do not currently exist.
联机日志损坏，不能做完整修复时，用的。
Changing the size and number of the online redo log files is sometimes done to tune the database.
改变在线重做日志文件大小和数量有时是优化数据库。
Whenever you add an online redo log file to the primary database, you should add corresponding online and standby redo log files to the standby database.
无论何时，你在主库添加在线重做日志文件，你应该在备库添加相应的在线重做日志和备用重做日志文件。
The on-disk RBA is the point up to which LGWR has flushed the redo thread to the online log files.
磁碟央行是这点已刷新LGWR的重做线程的在线日志文件。
The on-disk RBA is the point up to which LGWR has flushed the redo thread to the online log files.
磁碟央行是这点已刷新LGWR的重做线程的在线日志文件。
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