Dataguar Switchover Steps

1. Initiate the switchover operation on the primary database (On the original primary database)

- Verify database role

SQL> SELECT DATABASE_ROLE FROM V$DATABASE;

DATABASE_ROLE
----------------
PRIMARY

- Switch database role from primary to standby database

SQL> ALTER DATABASE COMMIT TO SWITCHOVER TO PHYSICAL STANDBY WITH SESSION SHUTDOWN WAIT;

Database altered.

- Shutdown database

SQL> SHUTDOWN IMMEDIATE

- Startup database

SQL> STARTUP

- Verify database role

SQL> SELECT DATABASE_ROLE FROM V$DATABASE;

DATABASE_ROLE
----------------
PHYSICAL STANDBY

- Start apply log process for standby database

SQL> ALTER DATABASE RECOVER MANAGE STANDBY DATABASE DISCONNECT;

2. Switch standby database to primary database (On the original standby database)
- Verify database role

SQL> SELECT DATABASE_ROLE FROM V$DATABASE;

DATABASE_ROLE
----------------
PHYSICAL STANDBY

- Switch database role from standby to primary database

SQL> ALTER DATABASE COMMIT TO SWITCHOVER TO PRIMARY;

Database altered.

- Shutdown database

SQL> SHUTDOWN IMMEDIATE

- Startup database

SQL> STARTUP

- Verify database role

SQL> SELECT DATABASE_ROLE FROM V$DATABASE;

DATABASE_ROLE
----------------
PRIMARY