RE: Cost vs Rule

awesome article - tanks

-----Original Message-----
Sent: Thu, March 07, 2002 3:44 PM
To: Multiple recipients of list ORACLE-L

Tim Gorman wrote a good paper about using these parameters: http://www.evdbt.com/SearchIntelligenceCBO.doc

Shaw John-P55297 wrote:
>
> have you tried adjusting optimzer_index_caching and
> optimizer_index_cost_adj?
>
> -----Original Message-----
> Sent: Thursday, March 07, 2002 1:23 PM
> To: Multiple recipients of list ORACLE-L
>
> I work in a dev shop - most of the sql is canned and pretty basic. We've
> been running CBO in all of our dev environments, but we have a few long
txns
> that just take forever. At the request of some savvy developers, I turned
> on RBO, and it brought down execution times dramatically.
>
> I've been analyzing affected tables often (we do a lot of bulk load/unload
> for testing), and have played with partitioning and clustering,
particularly
> on one table that's just a dog. CBO will always do a FTS where RBO uses
the
> PK to retrieve data.
>
> Where to go next? I've been unable to alter the costs dramatically enough
> to make any real difference in execution time.
>
> thx
>
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> Author: Magaliff, Bill
> INET: Bill.Magaliff_at_lendware.com
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> Author: Shaw John-P55297
> INET: P55297_at_motorola.com
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