Malden, They all same. I didn't change any parameters after upgrade. The difference in the plans are one used all hash join vs nested loop to join tables. The histograms are all same. db_file_multiblock_read_count is 8, sort_area_size is 1mb, hash_area_size is 40096. optimize_index_caching and optimizer_index_cost is 0/100 all same as 8i. The interesting part is after I changed optimize_feature_enable to 8.1.7. They produced the same explain plan.
Joan Mladen Gogala wrote: > > Joan, what is the difference in the plans? What specific feature > made the difference? Are the values of > optimizer_index_cost_adj and optimizer_index_caching same on both > versions? How about histograms? What is with > db_file_multiblock_read_count,sort_area_size and hash_area_size? Is > everything same as in 8i? May be setting of those parameters can be > tweaked to your benefit? > > On Wed, 2003-10-01 at 11:54, Joan Hsieh wrote: > > Kirti, > > > > I had upgraded a database from 8.1.7.4 to 9.2.0.4. Before the upgrade, > > performance is good. After upgrade, one query run time from 2 min to 12 > > hours. Of course, I re-analyzed all tables and indexes. The explain plan > > changed from hash join to nested-loop. All the parameters are same. So I > > have to put optimized_feature_enable=8.1.7 to make run normal as usual. > > I hate to disable the new feature, but no choose. > > > > Joan > > > > Kirtikumar Deshpande wrote: > > > > > > Were tables/indexes anlayzed after the upgrade? > > > > > > - Kirti > > > > > > --- Jeff Landers <[EMAIL PROTECTED]> wrote: > > > > Hello All > > > > > > > > Version & OS: > > > > Upgraded from 9.0.1.4 (Sun Solaris 2.8) to 9.2.0.3. > > > > > > > > Problem: > > > > We've captured the sql text and optimization plans for critical sql > > > > prior to upgrading to 9.2. After the upgrade we have noticed > > > > that the cost associated with every sql statement is now HUGE > > > > compared to its 9.0.1.4 counterpart. Per the statistics being captured > > > > via traces, > > > > these statement are noticeably slower per execution. > > > > > > > > Anyone experiencing/experienced the same problem with 9.2? > > > > > > > > Thank you in advance. > > > > > > > > > > > > > > __________________________________ > > > Do you Yahoo!? > > > Yahoo! SiteBuilder - Free, easy-to-use web site design software > > > http://sitebuilder.yahoo.com > > > -- > > > Please see the official ORACLE-L FAQ: http://www.orafaq.net > > > -- > > > Author: Kirtikumar Deshpande > > > 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 > > Note: > This message is for the named person's use only. It may contain confidential, > proprietary or legally privileged information. No confidentiality or privilege is > waived or lost by any mistransmission. If you receive this message in error, please > immediately delete it and all copies of it from your system, destroy any hard copies > of it and notify the sender. You must not, directly or indirectly, use, disclose, > distribute, print, or copy any part of this message if you are not the intended > recipient. Wang Trading LLC and any of its subsidiaries each reserve the right to > monitor all e-mail communications through its networks. > Any views expressed in this message are those of the individual sender, except where > the message states otherwise and the sender is authorized to state them to be the > views of any such entity. > > -- > Please see the official ORACLE-L FAQ: http://www.orafaq.net > -- > Author: Mladen Gogala > 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: Joan Hsieh 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).
