From: Heikki Linnakangas <heikki@enterprisedb.com>
To: Schwarz, Karl <Karl.Schwarz@ngc.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: function performance vs in-line sql
Date: Thu, 08 Mar 2007 17:52:34 +0000
Message-ID: <45F04D62.8090302@enterprisedb.com> (raw)
In-Reply-To: <9E64800D28DF264DB32B0309B6F222D5188548@xcgny105.northgrum.com>
References: <9E64800D28DF264DB32B0309B6F222D5188548@xcgny105.northgrum.com>
Schwarz, Karl wrote:
> I am having a performance problem with a query implemented within a
> server side function. If I use an SQL client(EMS Postgres) and manually
> generate the sql query I get about 100 times performance improvement
> over using the function.
>
> I've also tried using a prepared statement from my application and
> observed a similar performance improvement over the the function.
>
> The table I am quering against has several hundred thousand records. I
> have indexes defined and I've run vacuum several times.
>
> Is there something basic I am missing here with the use of a function. I
> am no database expert, but my assumption was that a function would give
> me better results than in-line sql.
>
> I've seen a mailing list entry in another list that implied that the
> query planner for a function behaves differently than in-line sql.
For starters, can you show us the function, the manual sql query and the
schema, please?
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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: heikki@enterprisedb.com, Karl.Schwarz@ngc.com
Subject: Re: function performance vs in-line sql
In-Reply-To: <45F04D62.8090302@enterprisedb.com>
* 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