Re: Cost-based optimizers

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04-11-2008, 07:19 AM

Luke Lonergan

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Re: Cost-based optimizers

Chris,

On 12/12/05 8:44 PM, "Christopher Kings-Lynne" <chriskl@familyhealth.com.au>
wrote:

> assumption of five. Thus, being able to correct mid-course is an area of
> enhancement for query optimizers that IBM is pursuing."
>
> Hmmm dynamic re-planning!

I recently interviewed someone who is in the research group working on this
at IBM. From what he said - it seems this is pretty far from making it's
way into the production codebase. Apparently there is too much history in
DB2's optimizer and the perception is that the risk / payoff is too high.

- Luke

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Re: Cost-based optimizers