Oracle-L: Re: Cost vs Rule

From: Joe Raube <jraube_at_yahoo.com>
Date: Wed, 13 Mar 2002 08:03:47 -0800
Message-ID: <F001.004274B4.20020313080347@fatcity.com>

How much have you played with Oracle Hints???

-Joe

"Magaliff, Bill" <Bill.Magaliff_at_lendware.com> wrote:
> 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
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Magaliff, Bill
> INET: Bill.Magaliff_at_lendware.com
>
> Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
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Received on Wed Mar 13 2002 - 10:03:47 CST