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check this slides, this gives you a great overview:
Upgrade & Migrate to Oracle 11.2 :
Thnx for reply
New Hardware is 3 times faster than old
Current os : IBM AIX 7.1
And yes same data volume .
We used EXPDP/IMPDP for upgrade
We analyzed AWR reports but it's showing that database is totally idle and smooth(also the same is replied by ORACLE )
We have 12 core and As we have observed that only 1 core is being utilized.
There should be some parameters setting regarding PT that will force to use more than 1 cpu