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it is just for convenience.
This soft link will help to use production backup by simply calling 'rmanbackup' , instead of mentioning the complete '/u02/backup/frm_prd_2009_mar02/' location every time.
You can verify this by checking later steps. they may not talk about /u02/backup/frm_prd_2009_mar02/ location much after the soft link creation.
DB refresh steps will vary greatly depending on the environment and method of refresh.
Try to read any one good Backup&Recovery Handbook. That will make you less dependent on documents.
But since you asked, I am sending one of the documents on RMAN based refresh with some good prefresh and postrefresh steps. But it should not be applied blindly on any environment, without understanding.
Edited by: krramnik on May 5, 2012 6:03 AM