How to restore standby from primary after failover.

HI we have a dr setup but the standby is provided archives through an application not the datagaurd.
So for applying application patch I cant switchover the database.
I have to shutdown the primary database and apply failover to the standby database to apply patch.
Can you please tell how can I restore my standby database to actual primary after failover.
As our actual activity will be in 2 weeks time. We want to apply patch on saturday.
DR DRILL is on 8th nov.

Your earlier statement "Can you please tell how can I restore my standby database to actual primary after failover"
means something different from "SO have to restore from cold backup of primary database"
What you seem to want is a procedure to recreate the Standby from a Backup of the Pirmary. (ie FROM Primary TO Standby).
You haven't specified your Oracle Version. DG has been available since 9i (was even backported to 8i) but I will presume that you are using 9i
You should follow the same process as used for the first creation of the standby, except that you don't have to repeat some of the setup steps (listener, tnsnames etc)
http://download.oracle.com/docs/cd/B10501_01/server.920/a96653/create_ps.htm#63563
Hemant K Chitale
http://hemantoracledba.blogspot.com

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