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We move an application that uses
OPTIMIZER_MODE=RULE from Oracle8 to 9i. Most of it is fine, but there are two
queries that have a very different execution plan. In one case, the execution
time increases from less than a minute to more than an hour. Neither query uses
any of the new Oracle 9i features.
My understanding is that the Rule optimizer code
has not changed, except to account for new features like IOT's. Has anyone else
seen this type of behavior?
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