From: Nikola Ivacic <nikola@rs-pi.com>
To: Bruno Wolff III <bruno@wolff.to>
Cc: PGSQL-sql@postgresql.org
Subject: Re: count(*) optimization
Date: Wed, 8 Jan 2003 17:15:23 +0100
Message-ID: <02b301c2b731$25d82d00$1100a8c0@rspi> (raw)
References: <024d01c2b72f$a6a7dcc0$1100a8c0@rspi>
<20030108162258.GA9033@wolff.to>
The problem is in other software I use,
witch uses count(*) function to display relation properties
pgAdmin II
phpPgAdmin
Nikola
----- Original Message -----
From: "Bruno Wolff III" <bruno@wolff.to>
To: "Nikola Ivacic" <nikola@rs-pi.com>
Cc: <pgsql-sql@postgresql.org>
Sent: Wednesday, January 08, 2003 5:22 PM
Subject: Re: [SQL] count(*) optimization
> On Wed, Jan 08, 2003 at 17:04:40 +0100,
> Nikola Ivacic <nikola@rs-pi.com> wrote:
> > Hi
> >
> > I have trouble executing count(*) statement.
> > On a large dataset it takes quite a while to return result.
> > Is there any other way to get number of tupples in relation
> > or is the only way to optimize count() function to index it?
>
> Indexes won't help count.
>
> If you retrieve counts a lot more than you do updates that will change
their
> value, then you may want to keep the counts in another table and use
> triggers to keep them updated.
>
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: nikola@rs-pi.com, bruno@wolff.to
Subject: Re: count(*) optimization
In-Reply-To: <02b301c2b731$25d82d00$1100a8c0@rspi>
* 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