DATAGUARD在做SWITCHOVER切换时遇到问题总结

1.主库在进行物理主备库角色转换的时候遇到ORA-01093错误

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;

2.备库在转换为主库时状态为：NOT ALLOWED--可能需要恢复或者退出恢复模式。

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.

3.主库切换为备库后，备库不做：alter database recover managed standby database cancel;也可以，此时已经自动断开了，日志中有提示：

Sun Apr 20 20:15:35 2014

Media Recovery Log /u01/app/oracle/prod/arch/1_62_844894247.dbf

Media Recovery Waiting for thread 1 sequence 63

Sun Apr 20 20:15:46 2014

Redo Shipping Client Connected as PUBLIC

-- Connected User is Valid

RFS[6]: Assigned to RFS process 19968

RFS[6]: Identified database type as 'physical standby'

RFS[6]: Archived Log: '/u01/app/oracle/prod/arch/1_63_844894247.dbf'

Sun Apr 20 20:15:50 2014

Media Recovery Log /u01/app/oracle/prod/arch/1_63_844894247.dbf
Identified End-Of-Redo for thread 1 sequence 63

Sun Apr 20 20:15:50 2014
Media Recovery End-Of-Redo indicator encountered

Sun Apr 20 20:15:50 2014
Media Recovery Applied until change 373573   ---最后应用到的SCN

Sun Apr 20 20:15:50 2014
MRP0: Media Recovery Complete: End-Of-REDO (PROD)

Resetting standby activation ID 257246883 (0xf5546a3)

Sun Apr 20 20:15:51 2014
MRP0: Background Media Recovery process shutdown (PROD)----MEDIA RECOVERY PROCESS已经关闭

Sun Apr 20 20:16:21 2014

alter database recover managed standby database cancel

Sun Apr 20 20:16:21 2014

ORA-16136 signalled during: alter database recover managed standby database cancel...