Method R Discussion GroupMethod R helps developers, DBAs, and decision-makers optimize Oracle-based software in every phase of the software life cycle. |
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Discuss Method R products, techniques, and events. Ask new questions or post your own responses. |
When I go through the sessions info, why do different sessions have different optimization settings even though they don't set explicitly?
This was a unique situation. The production environment was an OLTP and used first_rows settings. The development environment had Choose setting which defaults to all_rows.
In any case, whenever you hear a query perform wells in one environment and not in another, it almost always end up being a statistics issue or an optimizer parameter issue. |
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