Ideally, the locations of the members should be on separate disks so that the failure of one disk does not cause the loss of the entire online redo log.
理论上说，日志文件组的成员的存放位置应该放在磁盘上的不同位置，这样即使一个磁盘损坏也不会导致整个在线重做日志文件丢失。
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。
Maintaining multiple members of an online redo log group protects against the loss of the redo log.
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.
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。
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