Re: Re: Query never returns ...
От | Ross J. Reedstrom |
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Тема | Re: Re: Query never returns ... |
Дата | |
Msg-id | 20010208112045.B5409@rice.edu обсуждение исходный текст |
Ответ на | Re: Query never returns ... (Brice Ruth <brice@webprojkt.com>) |
Список | 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: >
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