Oracle, Siebel and rule-based optimization

[Michael Fontana]

I would like to ask a question of this esteemed and knowledgeable audience about running
SIEBEL applications on Oracle.  Siebel insists that their CRM application will only run with
acceptable performance if rule-based optimization is chosen, yet, as we all know, there are
documented examples of poor performance, and strong recommendations to the contrary from Oracle.

At one point, I recall reading an article from a knowledgeable consultant describing what must be done
to get Siebel to run with optimizer_mode=choose.  Any assistance in reaching this goal, or comments,
would be more than appreciated.  We're still in the implementation phase, and are already receiving
poor performance on certain processes, even using the recommended rule based optimization.  I
predict it will only get worse!