Re: pg_advisor schema proof of concept

On Thu, 2004-03-25 at 11:31, Fabien COELHO wrote:
>
> > > Also, if they have a partial index on the FK, it's not good enough! In
> > > CVS, IS NOT NULL partial indexes should be used, but in general all
> > > others still won't...
> >
> > Whoa, there, partner! Keep in mind that there are *often* reasons for using
> > a partial index on an FK, or even no index at all! The docs for pg_advisor
> > need to reflect that it only catches little details the developer might
> > otherwise have missed. It's not smarter than a DBA.
>
> Sure.
>
> That's why advices are "graded" from info to error in the current
> preliminary version.
>
> Advices that may or may not be good depending on undecidable elements
> have a lower grade. For instance, most attributes should be "NOT NULL"
> from a statistical point of view, but it is perfectly legitimate to
> have nullable attributes mostly anywhere, so the corresponding advices
> is just an "info".
>

Are you planning on making some type of differentiation on advise that
is performance based rather than advise that is theory based? I see
both cases being hinted at and it seems like a subtle but important
piece of information...

Robert Treat
--
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