Recovering from the loss of the current redo log group.
从当前重做日志组的丢失中恢复。
Recovering from the loss of an only active redo log group
从惟一活动重做日志组的丢失中恢复。
Recovering from the loss of one member of an online redo log group.
从丢失的联机重做日志组的成员中进行恢复。
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。
It is defined as "distance" between is and the end of the redo log.
它也被定义为从该位置到日志文件结束点的距离。
They have to log in again and redo whatever they were working on.
用户不得不重新登录，并且重新做一些他们曾经已经做过的事情。
They have to log in again and redo whatever they were working on.
用户不得不重新登录，并且重新做一些他们曾经已经做过的事情。
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