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Re: for/loop performance in plpgsql ?

From: Federico /* juri */ Pedemonte <fepede(at)inwind(dot)it>
To: pgsql-performance(at)postgresql(dot)org
Subject: Re: for/loop performance in plpgsql ?
Date: 2002-11-19 09:49:26
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
On Tue, Nov 19, 2002 at 12:23:56AM -0500, Tom Lane wrote:
> > result record;
> > for result in select rai, tem
> >                 from data
> >                 where (codice LIKE cod_staz and
> >                 ora > orain and
> >                 ora <= orafin) loop
> Which of these names are columns of the selected tables, and which ones
> are plpgsql variables?

rai, tem, codice, ora 	are columns name
cod_staz, orain, orafin are plpgsql variables

> The planner has to fall back to default selectivity estimates when it's
> looking at queries involving plpgsql variables (since it can't know
> their actual values in advance).  I suspect your problem is related to
> an inaccurate default estimate.

mmm... does it mean that i can't do anything about that ? 

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