ORA-01093
备库switchover为主库报如下错误：这个的原因是有active session连接到数据库上
可以使用如下命令解决：
ALTER DATABASE COMMIT TO SWITCHOVER TO PHYSICAL STANDBY WITH SESSION SHUTDOWN;
@>alter database commit to switchover to primary;
alter database commit to switchover to primary
*
ERROR at line 1:
ORA-01093: ALTER DATABASE CLOSE only permitted with no sessions connected
@>alter database commit to switchover to primary;
alter database commit to switchover to primary
*
ERROR at line 1:
ORA-01093: ALTER DATABASE CLOSE only permitted with no sessions connected
@>ALTER DATABASE COMMIT TO SWITCHOVER TO PHYSICAL STANDBY WITH SESSION SHUTDOWN;
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