If you set optimizer_mode to rule, it will be rule independent of stats unless sql's explicitly do something to invoke the cbo (eg with a hint etc).
Your greatest risk would be any SQL's that have a CHOOSE hint in them. But its worth the risk - rule based is a dead end street. hth connor --- Shaw John-P55297 <[EMAIL PROTECTED]> wrote: > 8.1.6 on NT > The product that I support is still Rule based. I am > planning to bring it > over to Cost based in the near future. What I wanted > to do was to set the > init parameter to 'RULE' and then run statistics on > the database. My boss > says we can't do this because "the execution plan > was different for the "set > to rule and have statistics" vs. "set to choose and > no statistics". > I haven't heard this before - can anybody point me > to the Fine Manual to > confirm or refute this. Perhaps this is another of > those fine urban legends? > For the time being I am starting out with a small > test database. > -- > 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). ===== Connor McDonald http://www.oracledba.co.uk (mirrored at http://www.oradba.freeserve.co.uk) "Some days you're the pigeon, some days you're the statue" __________________________________________________ Do You Yahoo!? Everything you'll ever need on one web page from News and Sport to Email and Music Charts http://uk.my.yahoo.com -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: =?iso-8859-1?q?Connor=20McDonald?= 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).
