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 <VIVEK_SHARMA_at_infosys.com> 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 <VIVEK_SHARMA_at_infosys.com> 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 <smcclure_at_usscript.com> a écrit
> :
> > >
> > 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: smcclure_at_usscript.com
> > >
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> > =====
> > Stéphane Paquette
> > DBA Oracle et DB2, consultant entrepôt de données
> > Oracle and DB2 DBA, datawarehouse consultant
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> >
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> =====
> Connor McDonald
> http://www.oracledba.co.uk
> http://www.oaktable.net
>
> "GIVE a man a fish and he will eat for a day. But
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Received on Wed Nov 20 2002 - 08:49:09 CST
