From: Tom Lane <tgl@sss.pgh.pa.us>
To: ow <oneway_111@yahoo.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: 7.4 - FK constraint performance
Date: Thu, 12 Feb 2004 10:54:20 -0500
Message-ID: <4559.1076601260@sss.pgh.pa.us> (raw)
In-Reply-To: <20040212000610.13913.qmail@web60806.mail.yahoo.com>
References: <20040212000610.13913.qmail@web60806.mail.yahoo.com>
ow <oneway_111@yahoo.com> writes:
> When I try to delete record, it takes > 3 min.
I think it must be using a seqscan for the foreign key check query.
Could you try this and show the results?
prepare foo(my.dint) as
SELECT 1 FROM ONLY "my"."large" x WHERE "small_id" = $1 FOR UPDATE OF x;
explain analyze execute foo(239);
When I try it I see an indexscan plan, but maybe there's some aspect of
your setup that's causing problems.
regards, tom lane
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-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, oneway_111@yahoo.com
Subject: Re: 7.4 - FK constraint performance
In-Reply-To: <4559.1076601260@sss.pgh.pa.us>
* 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