Does the query hit any other tables? If so, a different statistic
somewhere else might be influencing the optimisor. Otherwise certain
session / init parameters can influence the optimisor (multiblock read
count, block size even) - Sometimes it can be difficult to track down the
culprit but you should be able to find differences somewhere.
Craig Munday
<[EMAIL PROTECTED] To: Multiple recipients of list
ORACLE-L <[EMAIL PROTECTED]>
net.au> cc:
Sent by: Subject: Re: Oracle's use of Indexes
[EMAIL PROTECTED]
.com
19/09/2003 00:54
Please respond to
ORACLE-L
Craig,
Just out of interest, what type of application is running on the
database? I was just wondering why you were not using the plan stability
features in 8i on your production database.
Regards,
Craig Munday.
At 05:45 AM 2/06/2003 -0800, Craig Healey wrote:
>OK, I'm confused. Maybe it's Monday morning and my brain's not working.
>We have a production schema and a test schema on the same Oracle 8.1.7
>instance, running on Windows. They both have a customer table, with 3
>million and 2 million records respectively. They both have the same
>indexes, and both have been analyzed today. Production used an index and
>took 40ms. Test didn't and took 20s. I played around, analyzing,
>dropping and creating indexes etc. Now neither of them use the index,
>both taking around 20s.
>I can add a hint, which works, but I want to know what changed.
>
>TIA
>
>Craig Healey
>
>
>**********************************************************************************
>
>This email and any files transmitted with it are confidential and intended
>solely
>for the use of the individual or entity to whom they are addressed and may
>contain
>confidential and/or privileged material. Any review, retransmission,
>dissemination
>or other use of, or taking of any action in reliance upon, this
>information by
>persons or entities other than the intended recipient is
>prohibited. Statements
>and opinions expressed in this e-mail may not represent those of the
company.
>
>If you have received this email in error please notify
>[EMAIL PROTECTED]
>
>This footnote also confirms that this email message has been swept by
>MIMEsweeper
>for the presence of computer viruses (www.mimesweeper.com)
>
>***********************************************************************************
>
>--
>Please see the official ORACLE-L FAQ: http://www.orafaq.net
>--
>Author: Craig Healey
> INET: [EMAIL PROTECTED]
>
>Fat City Network Services -- 858-538-5051 http://www.fatcity.com
>San Diego, California -- Mailing list and web hosting services
>---------------------------------------------------------------------
>To REMOVE yourself from this mailing list, send an E-Mail message
>to: [EMAIL PROTECTED] (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.net
--
Author: Craig Munday
INET: [EMAIL PROTECTED]
Fat City Network Services -- 858-538-5051 http://www.fatcity.com
San Diego, California -- Mailing list and web hosting services
---------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: [EMAIL PROTECTED] (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).
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<---->>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Privileged/Confidential information may be contained in this message.
If you are not the addressee indicated in this message
(or responsible for delivery of the message to such person),
you may not copy or deliver this message to anyone.
In such case, you should destroy this message and kindly notify the sender
by reply e-mail or by telephone on (61 3) 9612-6999.
Please advise immediately if you or your employer does not consent to
Internet e-mail for messages of this kind.
Opinions, conclusions and other information in this message
that do not relate to the official business of
Transurban City Link Ltd
shall be understood as neither given nor endorsed by it.
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<---->>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<---->>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Privileged/Confidential information may be contained in this message.
If you are not the addressee indicated in this message (or responsible for delivery of
the message to such person), you may not copy or deliver this message to anyone.
In such a case, you should destroy this message and kindly notify the sender by reply
e-mail or by telephone on (03) 9612-6999 or (61) 3 9612-6999.
Please advise immediately if you or your employer does not consent to Internet e-mail
for messages of this kind.
Opinions, conclusions and other information in this message that do not relate to the
official business of Transurban Infrastructure Developments Limited and CityLink
Melbourne Limited shall be understood as neither given nor endorsed by them.
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<---->>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
--
Please see the official ORACLE-L FAQ: http://www.orafaq.net
--
Author: Mark Richard
INET: [EMAIL PROTECTED]
Fat City Network Services -- 858-538-5051 http://www.fatcity.com
San Diego, California -- Mailing list and web hosting services
---------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: [EMAIL PROTECTED] (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).
