ORA-16649: possible failover to another database prevents this database from being opened

We have two-node primary RAC database & two-node standby RAC database. For the business testing purpose, they will want both side of the database in the READ WRITE Mode. So we have decided to disabled the log shipping and made the standby database as a new primary database using failover database.

During the standby failover process, we made the existing primary database down. We have successfully failover the standby database as a new primary database. Once the process completed, we have disabled the DG configuration.

When we try to start the old primary database, we go the below error message. After analyzing further, we found the DG configuration file has been update from the standby database DG configuration file. Since the standby database become a new primary. So it has update the DG configuration file in the old primary database.

ORA-16649: possible failover to another database prevents this database from being opened

SOLUTION

After disabling the DG_BROKER_START=FALSE;  the old primary database able to start in the READ WRITE mode.

SQL> startup force

ORACLE instance started.

Total System Global Area 7.2958E+10 bytes

Fixed Size                  2235808 bytes

Variable Size            1.9059E+10 bytes

Database Buffers         5.3687E+10 bytes

Redo Buffers              209866752 bytes

Database mounted.

ORA-16649: possible failover to another database prevents this database from being opened

SQL> select database_role from v$database;

DATABASE_ROLE

----------------

PRIMARY

SQL> alter system set dg_broker_start=false scope=both sid='*';

System altered.

SQL> alter database open;

Database altered.