INDIA - INDIA1, INDIA2
LONDON - LONDON1, LONDON2
nodes - ol6-112-rac1, ol6-112-rac2

this is our primary database

this is our standby

if you go inside INDIA_sys you can see the current dataguard configuration

click on cluster database INDIA

click on verify dataguard performance

if configuration is correct you should seee message like this. click ok

you will see the current PROD and DR details. click on switchover

select os credentials for PROD db (INDIA) and click continue

select os credentials for DR db (LONDON) and click continue

provide confirmation

once switchover completed you will get this window

you can verify from dgmgrl as well

[oracle@ol6-112-rac1 trace]$ dgmgrl
DGMGRL for Linux: Version 11.2.0.3.0 - 64bit Production

Copyright (c) 2000, 2009, Oracle. All rights reserved.

Welcome to DGMGRL, type "help" for information.
DGMGRL> connect sys/oracle@INDIA
Connected.
DGMGRL> show configuration

Configuration - INDIA

  Protection Mode: MaxPerformance
  Databases:
    LONDON - Primary database
    INDIA  - Physical standby database

Fast-Start Failover: DISABLED

Configuration Status:
SUCCESS