| 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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| Thread: | |
| Lists: | pgsql-general 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 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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