Re: Highly obscure and erratic

From: Stephan Szabo <sszabo(at)megazone23(dot)bigpanda(dot)com>
To: Varun Kacholia <varunk(at)cse(dot)iitb(dot)ac(dot)in>
Cc: <pgsql-general(at)postgresql(dot)org>
Subject: Re: Highly obscure and erratic
Date: 2002-06-18 22:48:29
Message-ID: 20020618154806.U66411-100000@megazone23.bigpanda.com
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On Wed, 19 Jun 2002, Varun Kacholia wrote:

>
>
> > > hi,
> > > I cannot get what causes the difference in the execution of these 2 commands
> > > 1. SELECT * FROM dbmedia WHERE ID IN ((SELECT id FROM wdmedia WHERE word = 'whatever') ) LIMIT 20;
> > > 2. SELECT * FROM dbmedia WHERE ID IN (1234,2345,1242,1256,1245,1567,2222,22,345,234,567,456,35,56) ;
> >
> > The former is not very well optimized (see the FAQ for suggestions on
> > using EXISTS instead).
> hi ,
> Had a look at that..
> but still it is toooo slow :(
> when is it intended to be fixed up??

What does explain show for the exists version?

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