Oracle Database 11g Gata Guard Manual Switch Over on Linux





Oracle Data Guard -- Manual Switch Over


ON PRIMARY DATABASE:

Step # 1

Check Role of Primary Database

SQL> Select Database_role from v$database;

It will return "Primary".

Step # 2

Now check Switchover status of the database.

SQL> Select switchover_status from v$database;

It will return "Session Active"

Step # 3

Now perform manual switchover.

SQL> Alter Database commit to switchover to physical standby with session shutdown;
Database Altered.

Your Database has become Physical Standby.

Step # 4

You can verify this by querying Database_role of v$database, this time it will return "Physical Standby". Shutdown the database and again start it to mount stage.

SQL> Shutdown Immediate;
SQL> Startup Mount;


SQL> Select Database_role from v$database;

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


ON STANDBY DATABASE:

Step # 1

Check Role of Standby Database

SQL> Select Database_role from v$database;

It will return "Physical Standby ".

Step # 2

Now check Switchover status of the database.

SQL> Select switchover_status from v$database;

It will return "Session Active"

Step # 3

Now cancel the MRP which is running in the background of the Standby Database.

SQL> Alter Database Recover Managed Standby Database Cancel;
Database Altered.

Step # 4

Now perform manual switchover from Physical Standby to Primary.

SQL> Alter Database commit to switchover to primary with session shutdown;
Database Altered.

Now your Physical Standby database as has become Primary.

Step # 5

You can verify this by querying Database_role of v$database, this time it will return "Primary". Shutdown the database and again start it to mount stage.

SQL> Shutdown Immediate;
SQL> Startup Mount;


SQL> Select Database_role from v$database;

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

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