Vivek, As John K Suggested, take a look at Tim's paper "The Search for Intelligent Life in the Cost-Based Optimizer". He discussed the impact of these settings.
http://www.evergreen-database.com/ Gaja also discusses these parameters and their possibly optimal values in his paper. You can find that in quest's web site. HTH Cheers, RS --- VIVEK_SHARMA <[EMAIL PROTECTED]> wrote: > > What would be an Optimal Reduced Value of > OPTIMIZER_INDEX_COST_ADJ > to make it favour index searches ? > > Default Value is 100. > > Thanks > > > -----Original Message----- > Sent: Wednesday, November 20, 2002 4:54 PM > To: Multiple recipients of list ORACLE-L > > > One quick hack is to set the "optimizer_..." params > to > make indexes look super-wonderful, which then gives > you a rule-based "look and feel" with hopefully a > little smarter selection of indexes as a bonus > > hth > connor > > --- VIVEK_SHARMA <[EMAIL PROTECTED]> wrote: > > > > Consider using OUTLINES for Fixed Execution plans > > especially for Batch Queries > > > > This will prevent a Sudden Increment in Processing > > Time due to Optimizer choosing NON-Optimal paths > > > > > > -----Original Message----- > > Sent: Wednesday, November 20, 2002 3:20 AM > > To: Multiple recipients of list ORACLE-L > > > > > > We will be in the same process soon. > > We'll have to consolidate over 100 instances to > > something between 40-60 instances and switch from > > RBO > > to CBO. > > > > Any tips are welcome. > > > > > > --- Steve McClure <[EMAIL PROTECTED]> a �crit > : > > > > > I am just starting to look at converting to the > cost > > > based optimizer, and am > > > hoping a few of you can share insights from > having > > > done so in the past. Our > > > application is an oltp system developed on > 7.3.4. > > > > > We made liberal use of > > > +0 and other RBO "hints", and I am wondering if > > > these are going to cause us > > > troubles when switching to CBO. > > > > > > We have been on 8i since April of this year, > and > > I > > > am just now starting to > > > gather information on the inner workings of the > > CBO. > > > I know it is where I > > > want to be, I am just looking to see how > > > painful/painless the transition > > > will be. > > > > > > Steve McClure > > > > > > -- > > > Please see the official ORACLE-L FAQ: > > > http://www.orafaq.com > > > -- > > > Author: Steve McClure > > > 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). 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