You should in test env before changing the optimizer through intensive benchmarks. However, if you are working with 8i, try with outlines. Consider changing to first_rows and evaluate the set of optimizer_index_caching, optimizer_index_cost_adj and optimizer_max_permutations.
Regards. --- Shaw John-P55297 <[EMAIL PROTECTED]> wrote: > I have a large app that is still running rule based, > we are finally going to > take the plunge and try to start going cost based. > The first time we tried > this the performance was terrible in a lot of > places. Does anyone have any > good white papers or hints/tips on what to look for > on areas that might be > problems or pitfalls? > tia > ... --- ... .... . .-.. .--. -- . .. .----. -... . . > -. .--. .-. --- -... > .-.. > John B. Shaw > (ribit) > / > o o > ( -- ) > /\( , ,)/\ > ^^ ^^ ^^ ^^ > > -- > Please see the official ORACLE-L FAQ: > http://www.orafaq.com > -- > Author: Shaw John-P55297 > INET: [EMAIL PROTECTED] > > 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: [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). ===== ENG. Christian Trassens Senior DBA [EMAIL PROTECTED] [EMAIL PROTECTED] Phone : +34-699240979 +34-649824704 __________________________________________________ Do You Yahoo!? Send FREE video emails in Yahoo! Mail! http://promo.yahoo.com/videomail/ -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Christian Trassens INET: [EMAIL PROTECTED] 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: [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).