Oracle-L: RE: Cost vs Rule

From: DENNIS WILLIAMS <DWILLIAMS_at_LIFETOUCH.COM>
Date: Wed, 13 Mar 2002 03:33:31 -0800
Message-ID: <F001.00426BCC.20020313033331@fatcity.com>

Well, since hints are implemented within comments, I would assume that other databases would simply ignore them. If anyone has direct experience, that would be interesting. Being completely database-agnostic may play against tuning.

Just a thought. I suppose you analyzed all tables when you were testing CBO?
Dennis Williams
DBA
Lifetouch, Inc.
dwilliams_at_lifetouch.com

-----Original Message-----
Sent: Thursday, March 07, 2002 2:00 PM
To: Multiple recipients of list ORACLE-L

not much - desire is to keep sql ANSI compliant due to cross-platform issues (want to be able to run the app on multiple db's)

-----Original Message-----
Sent: Thu, March 07, 2002 2:44 PM
To: Multiple recipients of list ORACLE-L

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
>
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-- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Joe Raube INET: jraube_at_yahoo.com Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- 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 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: DENNIS WILLIAMS INET: DWILLIAMS_at_LIFETOUCH.COM Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).

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Received on Wed Mar 13 2002 - 05:33:31 CST