由於之前的switchover失敗，後手工恢復了錯誤。導致 dg broker的配置文件顯示的是錯誤的，db131現在已經是備庫了，而dg broker配置文件還是顯示是primary database.
主備庫看到的錯誤是不一樣的，db131配置信息顯示 db132是主庫，db132顯示的db131是主庫。
DB131:
DGMGRL> show configuration;
Configuration - dg_test11
Protection Mode: MaxPerformance
Databases:
db132 - Primary database
db131 - Physical standby database
Fast-Start Failover: DISABLED
Configuration Status:
ORA-16597: Data Guard broker detects two or more primary databases
ORA-16625: cannot reach database "db132"
DGM-17017: unable to determine configuration status
DB132:
DGMGRL> show configuration;
Configuration - dg_test11
Protection Mode: MaxPerformance
Databases:
db131 - Primary database
db132 - Physical standby database
Fast-Start Failover: DISABLED
Configuration Status:
ORA-16623: database detected role change
ORA-16625: cannot reach database "db131"
DGM-17017: unable to determine configuration status
數據庫實際的情況是這樣的：
DB131:
SQL> select database_role,db_unique_name,open_mode,protection_mode,protection
DATABASE_ROLE DB_UNIQUE_NAME OPEN_MODE
---------------- ------------------------------ --------------------
PROTECTION_MODE PROTECTION_LEVEL SWITCHOVER_STATUS
-------------------- -------------------- --------------------
PHYSICAL STANDBY db131 READ ONLY WITH APPLY
MAXIMUM PERFORMANCE MAXIMUM PERFORMANCE NOT ALLOWED
DB132：
SQL> select database_role,db_unique_name,open_mode,protection_mode,protection_level,switchover_status from v$database;
DATABASE_ROLE DB_UNIQUE_NAME OPEN_MODE
---------------- ------------------------------ --------------------
PROTECTION_MODE PROTECTION_LEVEL SWITCHOVER_STATUS
-------------------- -------------------- --------------------
PRIMARY db132 READ WRITE
MAXIMUM PERFORMANCE MAXIMUM PERFORMANCE TO STANDBY
試着disable database，失敗。
DGMGRL> disable database db131
Error: ORA-16623: database detected role change
Error: ORA-16625: cannot reach database "db131"
Failed.
DGMGRL> disable database db132
Error: ORA-16623: database detected role change
Error: ORA-16625: cannot reach database "db131"
Failed.
只能暴力刪除了，手動刪除主庫的dg broker配置的原文件，文件存放的目標可以通過show parameter dg_broker來查看。主備都需要
[oracle@qht131 dbs]$ mv dr1db131.dat dr1db131.dat_bak
[oracle@qht131 dbs]$ mv dr2db131.dat dr2db131.dat_bak
將dg_broker_start關閉後重新開啓，主備都需要
SQL> alter system set dg_broker_start=false scope=both;
System altered.
SQL> alter system set dg_broker_start=true scope=both;
System altered.
這時再看dg broker的配置信息：
DGMGRL> show configuration;
ORA-16532: Data Guard broker configuration does not exist
根據目前 主從庫的實際情況重新建立dg broker的配置，主庫是db132,從庫是db131:
DGMGRL> create configuration dg_test11 as primary database is db132 connect identifier is orcl132;
Configuration "dg_test11" created with primary database "db132"
DGMGRL> add database db131 as connect identifier is orcl131 maintained as physical;
Database "db131" added
DGMGRL> show configuration;
Configuration - dg_test11
Protection Mode: MaxPerformance
Databases:
db132 - Primary database
db131 - Physical standby database
Fast-Start Failover: DISABLED
Configuration Status:
DISABLED
狀態是DISABLED，需要enable一下：
DGMGRL> enable configuration;
Enabled.
DGMGRL> show configuration;
Configuration - dg_test11
Protection Mode: MaxPerformance
Databases:
db132 - Primary database
db131 - Physical standby database
Fast-Start Failover: DISABLED
Configuration Status:
SUCCESS
試着進行一次switchover:
DGMGRL> switchover to db131
Performing switchover NOW, please wait...
New primary database "db131" is opening...
Operation requires shutdown of instance "orcl" on database "db132"
Shutting down instance "orcl"...
ORA-01031: insufficient privileges
Warning: You are no longer connected to ORACLE.
Please complete the following steps to finish switchover:
shut down instance "orcl" of database "db132"
start up instance "orcl" of database "db132"
重啓一下db132後一切正常了。
不過不太清楚這樣強制刪除dg broker配置對數據庫有沒有什麼影響。