要防止脱机归档日志的单点故障，比如媒介失败，则应该使用日志镜像。
To prevent a single point of failure for offline archive logs such as media failure, log mirroring shouldl be used.
脱机归档日志——如果将联机归档日志从活动日志所在目录移动到其他目录或磁带中，就成为了脱机归档日志。
Offline archive logs - archive logs that are being moved from active log directory to either another directory in another media or tape.
在Oracle中，要从默认的脱机备份切换到具有自动归档的联机备份，您需要执行下面的操作。
To switch to an online with auto archive from the default offline backup in Oracle, you need to do the following.
在Oracle中，要从默认的脱机备份切换到具有自动归档的联机备份，您需要执行下面的操作。
To switch to an online with auto archive from the default offline backup in Oracle, you need to do the following.
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