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Re: Queries within a function

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Mridula Mahadevan <mmahadevan(at)stratify(dot)com>
Cc: "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Queries within a function
Date: 2010-02-02 19:27:59
Message-ID: 29024.1265138879@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-performance
Mridula Mahadevan <mmahadevan(at)stratify(dot)com> writes:
>  I am running a bunch of queries within a function, creating some temp tables and populating them. When the data exceeds say, 100k the queries start getting really slow and timeout (30 min). when these are run outside of a transaction(in auto commit mode), they run in a few seconds. Any ideas on what may be going on and any postgresql.conf parameters etc that might help?

I'll bet the function is caching query plans that stop being appropriate
once the table grows in size.  You might have to resort to using
EXECUTE, although if you're on 8.4 DISCARD PLANS ought to help too.

			regards, tom lane

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