Tarik, Since your question did not receive a reply, I'm guessing the answer isn't a simple one. Memory requirements are significantly different in 10g (guess more). Are you truly only concerned with PGA memory? If so, perhaps you could take a representative test on 9i, measure the PGA, then run the same test on 10g. Again, I haven't studied this issue in detail, but since you didn't get any replies, I thought maybe this would either help you or provoke someone more knowledgable into replying. Dennis Williams