From: Willo van der Merwe <willo@mirasol.co.za>
To: pgsql-performance@postgresql.org
Subject: Performance issue
Date: Mon, 27 Aug 2007 15:41:42 +0200
Message-ID: <46D2D496.60005@mirasol.co.za> (raw)
Hi Guys,
I have something odd. I have Gallery2 running on PostgreSQL 8.1, and
recently I upgraded to 8.1.9-1.el4s1.1 (64bit). The issue here really is
how do I get PostgreSQL to work with their horrible code. The queries
they generate look something like :
SELECT blah, blah FROM table1, table2 WHERE <some relational stuff> AND
id IN (<here a list of 42000+ IDs are listed>)
On the previous version (which I can't recall what it was, but it was a
version 8.1) the queries executed fine, but suddenly now, these queries
are taking up-to 4 minutes to complete. I am convinced it's the
parsing/handling of the IN clause. It could, of course, be that the list
has grown so large that it can't fit into a buffer anymore. For obvious
reasons I can't run an EXPLAIN ANALYZE from a prompt. I vacuum and
reindex the database daily.
I'd prefer not to have to rewrite the code, so any suggestions would be
very welcome.
Kind regards
Willo van der Merwe
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-performance@postgresql.org
Cc: willo@mirasol.co.za
Subject: Re: Performance issue
In-Reply-To: <46D2D496.60005@mirasol.co.za>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox