RE: Do programmers tune SQL?

> From: root_at_fatcity.com [mailto:root_at_fatcity.com]On Behalf Of Rachel
> Carmichael
>
> Larry,
>
> Mine is Glenmorangie in a port finish. Write me offline for the address
> :)
>
> Oh -- your poor programmers who have queries that don't perform in
> production as they do in development? Have you tried export and
> importing the statistics from production into development (dbms_stats)
> and stored outlines?

So you decided to change careers on us after that last gig wrapped up? You can drop the DBA part ;-)

http://www.drinkgoodstuff.com/dbaliquor_ny.htm.

Anyway, using DBMS_STATS for consistency could help generate the same plans in development as would be generated in prod if all other factors were constant (parameters, etc, and no they aren't, something else being slowly addressed). And using outlines to capture and exporting/importing the OL$ and OL$HINTS tables after, or selected rows, from dev to prod could be used as insurance for getting the same plan when moving from dev to prod. But, they would still be executing and tuning against the test data that doesn't, in many cases, remotely resemble production in it's characteristics and distributions. So, assuming we always get the same plan in test that we would in prod because of using the same stats, the query flies in dev, we lock in the plan and move to prod, it still doesn't mean it is the best access paths for prod and the "real" data. And that's the bigger problem, the "best" access path in dev isn't necessarily the best access path in prod.

And before some "sales critter" calls, yes, ways to better mimic production data, and tools versus homegrown approaches, are being considered ;-)

Everyone have a good weekend. Time to go play in the rain.

Larry G. Elkins
elkinsl_at_flash.net

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