Re: Re: Query never returns ... - Mailing list pgsql-sql

From Ross J. Reedstrom
Subject Re: Re: Query never returns ...
Date
Msg-id 20010208112045.B5409@rice.edu
Whole thread Raw
In response to Re: Query never returns ...  (Brice Ruth <brice@webprojkt.com>)
List pgsql-sql
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
usingpk_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:
> 


pgsql-sql by date:

Previous
From: "Albert REINER"
Date:
Subject: Re: Re: SQL Join - MySQL/PostgreSQL difference?
Next
From: Josh Berkus
Date:
Subject: Re: Re: Query never returns ...