RMAN blockrecover

http://www.dbasupport.com/forums/showthread.php?referrerid=15940&t=56629

RMAN> backup validate check logical database

and then post the result.

if it reports any corruption try looking into the following view

select * from v$database_block_corruption;

if rman reports corruption you can try

rman>blockrecover corruption list;

another method check corruption is runing dbverify on the datafile.