The lag between the incremental checkpoint target and the log tail is also limited by 90% of the smallest online log file size.
增量检查点和日志末尾之间的间隔被最小在线日志文件大小的90%所限制。
Restore log file option restores the log files saved in the backup image (more applicable for online backup and restore).
恢复日志文件选项恢复备份映像中保存的日志文件(适用于在线备份和恢复)。
Normally, a switch occurs when the current online redo log file is full and writing must continue.
一般来说，当当前的在线重做日志文件已经满了并且还必须继续写的是偶，日志切换就会发生。
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。
You can add or drop online redo log file groups or members to the primary database without affecting the standby database.
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.
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。
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