oracle 12.0.1 rac搭建dg，虚拟机异常断电，备库报错【ORA-10458 和 ORA-01196】
执行：alter database open read only;报错如下：ORA-10458: standby database requires recoveryORA-01196: 文件 1 由于介质恢复会话失败而不一致然后启动备库到mount状态执行：alter database recover managed standby database using current logfile disconnect from session;开启应用日志，没有报错执行取消实
