Re: Compute statisics

Probably. I'm not responsible for posts I answer in the middle of the night.

Jared

On Thursday 07 June 2001 07:21, Connor McDonald wrote:
> Didn't I already say Chapter 8 ????
>
> :-)
>
> Connor
>
> --- Jared Still <jkstill_at_cybcon.com> wrote: >
>
> > Are these defaults recorded somewhere that
> > mere mortals have access to?
> >
> > Jared
> >
> > On Thursday 07 June 2001 00:25, Mogens Nørgaard
> >
> > wrote:
> > > Any stat missing in a CBO situation will be set to
> >
> > the hard-coded default
> >
> > > values found in the source code. One example (out
> >
> > of about 40 or so
> >
> > > values) is default selectivity for equality
> >
> > predicates. Before 7.3 it was
> >
> > > 0.125 (meaning that a where= condition would
> >
> > assume you needed to scan
> >
> > > 1/8th of the table). In 7.3 and later it was
> >
> > fortunately set to 0.01 (1%).
> >
> > > Another of my favorite default values is number of
> >
> > leaf blocks in an
> >
> > > index. It's 25.
> > >
> > > Connor McDonald wrote:
> > > > Hi Jared,
> >
> > --
> > Please see the official ORACLE-L FAQ:
> > http://www.orafaq.com
> > --
> > Author: Jared Still
> > INET: jkstill_at_cybcon.com
> >
> > Fat City Network Services -- (858) 538-5051 FAX:
> > (858) 538-5051
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> > access / Mailing Lists
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> =====
> 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"
>
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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Jared Still
  INET: jkstill_at_cybcon.com

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