Re: optimizer_max_permutations

Yes starting from db version 8.1.7 for 11i. For 8.1.6 there was no such requirement IIRC.
I tried to be smart and ignored the recommendation once when upgrading to 8.1.7 - the result, some queries which were using a view (which name I don't remember anymore) got extremely slow. I learned a lesson.

Tanel.

• Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Tuesday, August 26, 2003 8:54 PM

> Just fyi - it seems that Oracle had realized this in advance and has
> specifically instructed the Oracle Applications 11i installations to set
> this to 2000.
>
> John Kanagaraj
> DB Soft Inc
> Phone: 408-970-7002 (W)
>
> Listen to great, commercial-free christian music 24x7x365 at
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> ** The opinions and facts contained in this message are entirely mine and
do
> not reflect those of my employer or customers **
>
> -----Original Message-----
> Sent: Tuesday, August 26, 2003 8:55 AM
> To: Multiple recipients of list ORACLE-L
>
>
> One thing that the docs don't mention is that '80000'
> (the default in 8) is also a special boundary value.
> Anything less than 80,000 changes some of ways the
> optimizer does it work, ie, its not just a reduction
> in permutations.
>
> Can't remember the specifics - join orders spring to
> mind but there is a metalink note about it.
>
> Because of this, there's a school of thought that even
> on 8i, adopting the (9i default) value of 2000 will
> improve the "general" optimizer performance (ie the
> quality of the decisions it makes).
>
> Cheers
> Connor
>
> --- "Boivin, Patrice J" <BoivinP_at_mar.dfo-mpo.gc.ca>
> wrote: > Has anyone worked with this one?
> >
> >
>

http://download-west.oracle.com/docs/cd/A87860_01/doc/server.817/a76961/ch11
> > 23.htm#81357
> >
>

<http://download-west.oracle.com/docs/cd/A87860_01/doc/server.817/a76961/ch1
> > 123.htm#81357>
> >
> > Patrice.
> >
>
> =====
> Connor McDonald
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Author: Tanel Poder
  INET: tanel.poder.003_at_mail.ee

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