From: Richard Huxton <dev@archonet.com>
To: Rudi Starcevic <rudi@oasis.net.au>
To: pgsql-sql@postgresql.org
Subject: Re: Analyze + Index
Date: Fri, 29 Nov 2002 10:32:26 +0000
Message-ID: <200211291032.26769.dev@archonet.com> (raw)
In-Reply-To: <3DE6F0D7.1060700@oasis.net.au>
References: <3DE6E741.3010406@oasis.net.au>
<3DE6F0D7.1060700@oasis.net.au>
On Friday 29 Nov 2002 4:45 am, Rudi Starcevic wrote:
> Hi,
>
> I think I've found what I need to know.
> From techdocs.postgresql.org
>
> >> Every you run an INSERT, UPDATE, or DELETE on an indexed table,
>
> PostgreSQL must update all of the table's indexes to reflect the new
> data (unlike some
>
> >> RDBMSs, PostgreSQL updates indexes immediately so they never get out
> of synch with the data).
Yep - the ANALYSE updates the statistics the planner uses. So - you should
analyse when a noticable portion of your data has changed. If you had 3000
users and batch inserted 1000 users you'd probably want to ANALYSE.
--
Richard Huxton
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To: pgsql-sql@postgresql.org
Cc: dev@archonet.com, rudi@oasis.net.au
Subject: Re: Analyze + Index
In-Reply-To: <200211291032.26769.dev@archonet.com>
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