SQL> select switchover_status from v$database;
SWITCHOVER_STATUS
--------------------
SESSIONS ACTIVE ----------有活动会话。
SQL> ALTER DATABASE COMMIT TO SWITCHOVER TO PHYSICAL STANDBY;
ALTER DATABASE COMMIT TO SWITCHOVER TO PHYSICAL STANDBY
*
ERROR at line 1:
ORA-01093: ALTER DATABASE CLOSE only permitted with no sessions connected
此错误的因为主库中有活动的会话造成的，解决的办法为：
1.杀掉活动会话，重新执行该命令
2.在该命令后面加上with session shutdown即
ALTER DATABASE COMMIT TO SWITCHOVER TO PHYSICAL STANDBY WITH SESSION SHUTDOWN;
SQL> select switchover_status from v$database;
SWITCHOVER_STATUS
--------------------
NOT ALLOWED
SQL> alter database commit to switchover to primary;
alter database commit to switchover to primary
*
ERROR at line 1:
ORA-16139: media recovery required
或者如下：--RECOVERY NEEDED
SQL> select switchover_status from v$database;
SWITCHOVER_STATUS
--------------------
RECOVERY NEEDED
###############
SQL> alter database recover managed standby database disconnect from session;
Database altered.
SQL> select switchover_status from v$database;
SWITCHOVER_STATUS
--------------------
TO PRIMARY
SQL> alter database commit to switchover to primary;
Database altered.
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