Re: Re: Query never returns ...

From: "Ross J(dot) Reedstrom" <reedstrm(at)rice(dot)edu>
To: Brice Ruth <brice(at)webprojkt(dot)com>
Cc: pgsql-sql(at)postgresql(dot)org
Subject: Re: Re: Query never returns ...
Date: 2001-02-08 17:20:45
Message-ID: 20010208112045.B5409@rice.edu
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Brice -
What does EXPLAIN say for that query? With empty tables, I get two index scans,
a merge join, and two sorts. I'm guessing wildly that you've got a non-optimal
sort strategy happening somehow, given the four fold ORDER BY clause.

Ross

Here's the empty version:

NOTICE: QUERY PLAN:

Sort (cost=84.25..84.25 rows=100 width=64)
-> Merge Join (cost=8.30..80.93 rows=100 width=64)
-> Index Scan using pk_tblmedcond on tblmedcond (cost=0.00..60.00 rows=1000 width=36)
-> Sort (cost=8.30..8.30 rows=10 width=28)
-> Index Scan using pk_tblsidedruglink on tblsidedruglink (cost=0.00..8.14 rows=10 width=28)

EXPLAIN

On Thu, Feb 08, 2001 at 10:19:43AM -0600, Brice Ruth wrote:
> FYI - I let the query run for 11.5 minutes before killing it off. It
> had consumed 11 minutes, 18 seconds of CPU time (reported by ps). The
> following messages are from the server log, I'm pasting in all messages
> directly following the query:
>

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