Re: Default Stats Revisited

Robert Treat wrote:
> On Thursday 11 March 2004 14:17, Josh Berkus wrote:
> > Tom,
> >
> > > Maybe you should ask on -admin or -general.  Personally I thought there
> > > wasn't anything to say until someone did some experiments to show
> > > whether an indexed-column differential is really worthwhile and what a
> > > plausible default value would be.  The idea sounds good in the abstract,
> > > but will it really help or just be another useless setting?
> >
> > Yeah, that's our next step, a test.
> >
> > On Monday,  I hope to have comparative stats for a difficult database on
> > the 3 solutions (leaving things as-is, raising the general default stats,
> > and doing index_stats).
> 
> Do you plan on handeling primary key columns differently (since they are 
> likely to be unique and indexed) ?

Another idea is whether a foreign key column should get extra
statistics?

> Also how will you handle column that are part of expressional indexes (where 
> foo is true for example) ?
> 
> Final thought... I'm a DBA and I think the straight number is simpler, though 
> could be convinced to go with whichever is higher... 

Agreed.

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