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Different OPtimizer behaviour on Ora9iR2 ( patch 7 )-Shared server [message #213626] Thu, 11 January 2007 09:57 Go to next message
Messages: 7
Registered: December 2006
Location: Maribor,Slovenia
Junior Member
Under shared server connection architecture ( MTS ) the optimizer is behaving totally unlogical.
This is not the problem if I switch the optmizer mode to rule based with backward compatibility to 8i (init.ora parameters ).

But on the other way the same queries work perfectly also with cost based optimized If I switch to dedicated mode!

What should I do:
1. to switch whole production database instance to dedicated mode
- I am afraid of consuming more memory and swapping

2. to switch the optimizer mode back to 8i
- this doesn't sounds great because of future upgrades where
we'll have get to use on cost based

3. Would upgrade to patch 8 ( ) do any help on
behaviour of cost based optimizer on shared server ( previous MTS )

Thanx in advance,
Re: Different OPtimizer behaviour on Ora9iR2 ( patch 7 )-Shared server [message #213864 is a reply to message #213626] Fri, 12 January 2007 10:12 Go to previous message
Messages: 619
Registered: July 2006
Senior Member
Check it with Oracle support.
(Hopefully) they will know something.
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