I have not worked with a 8.0 database in 4 years and can't remember if the version emits STAT entries to the trace with a 10046 trace. That would be the ultimate word on what access path was used.
At 03:44 PM 10/10/2003, you wrote:
All
We have a 8.0.4 database using choose optimizer. We have a query that access a single table using index.
If we analyze the table and indexes - query takes 8 min to complete
If we analyze table and then delete stats on indexes - query runs in two minutes.
Explain plan is the same in both cases. I did a event 10053 trace but could not find any difference between the choices the CBO makes except when the indexes are not analyzed it thinks the cost is low.
Any ideas why the query would execute faster - with the same explain plan - if the CBO thinks its cost is low ?
PS : We ruled out the effects of caching in the buffer by reversing the order of the tests..
TIA
Babu -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Oracle-L 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).
Wolfgang Breitling Centrex Consulting Corporation http://www.centrexcc.com
-- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Wolfgang Breitling 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).