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Wrong forum, you need to post this question to the database/RMAN forum.
Read the texts bellow. But, you can use Export/ Import or Oracle Upgrade (CPU).
11gR1 Upgrade Doc - http://download.oracle.com/docs/cd/B28359_01/server.111/b28300/toc.htm
11gR2 Upgrade Doc - http://download.oracle.com/docs/cd/E11882_01/server.112/e10819/toc.htm