从丢失的联机重做日志组的成员中进行恢复。
Recovering from the loss of one member of an online redo log group.
您可以在数据库上启用归档日志记录模式，并开始联机备份数据库以及备份数据库中的一组表空间。
You can enable archive logging mode on the database and start taking online backups of the database as well as backups of a set of table Spaces in the database.
表明例程恢复不再需要联机重做日志组，它可能已经归档也可能未归档。
INACTIVE - Log is no longer needed for instance recovery. It may be in use for media recovery. It might or might not be archived.
联机重做日志组是活动的，但是并非当前联机重做日志组，崩溃恢复需要该状态。
Active - log is active but is not the current log. It is needed for crash recovery. It.
联机重做日志组是活动的，但是并非当前联机重做日志组，崩溃恢复需要该状态。
Active - log is active but is not the current log. It is needed for crash recovery. It.
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