Re: Compute statisics

Ya know, having read that entire chapter last week you would think I could remember this.

Jared

On Thursday 07 June 2001 05:30, Toepke, Kevin M wrote:
> Jared:
>
> In the Oracle 8.1.6 Docs:
> Oracle8i Designing and Tuning for Performance
> 8 Gathering Statistics
> Table 8-2 Default Table and Index Values When
> Statistics are Missing
>
> Kevin
>
> -----Original Message-----
> Sent: Thursday, June 07, 2001 6:21 AM
> To: Multiple recipients of list ORACLE-L
>
>
>
> 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,

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Author: Jared Still
  INET: jkstill_at_cybcon.com

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