From: Robins <tharakan@gmail.com>
To: pgsql-performance@postgresql.org
Subject: Re: Performance across multiple schemas
Date: Wed, 29 Aug 2007 08:15:09 +0530
Message-ID: <36af4bed0708281945o62e4fa58r9ec30b505fb779f8@mail.gmail.com> (raw)
In-Reply-To: <36af4bed0708281850v5348da17y97b7df2e696262e9@mail.gmail.com>
References: <36af4bed0708280605j5448ac52of6f7dc08791f0ab2@mail.gmail.com>
<23414.1188308966@sss.pgh.pa.us>
<36af4bed0708281850v5348da17y97b7df2e696262e9@mail.gmail.com>
Thanks Tom,
Exactly what I did, when I realised that there was an extra Table in the
FROM with no conditions set.
Well anyway, this did clear my doubts about whether schema affects
performance at all.
Robins
On 8/29/07, Robins Tharakan <robins@pobox.com> wrote:
>
> Thanks Tom,
>
> Exactly what I did, when I realised that there was an extra Table in the
> FROM with no conditions set.
>
> Well anyway, this did clear my doubts about whether schema affects
> performance at all.
>
> Robins
>
> On 8/28/07, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> >
> >
> > Schemas are utterly, utterly irrelevant to performance.
> >
> > I'm guessing you missed analyzing one of the tables, or forgot an index,
> > or something like that. Also, if you did anything "cute" like use the
> > same table name in more than one schema, you need to check the
> > possibility that some query is selecting the wrong one of the tables.
> >
> > The explain output you showed is no help because the expense is
> > evidently down inside one of the functions in the SELECT output list.
> >
> > One thing you should probably try before getting too frantic is
> > re-ANALYZEing all the tables and then starting a fresh session to
> > clear any cached plans inside the functions. If it's still slow
> > then it'd be worth digging deeper.
> >
> > regards, tom lane
>
>
--
Robins
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: tharakan@gmail.com
Subject: Re: Performance across multiple schemas
In-Reply-To: <36af4bed0708281945o62e4fa58r9ec30b505fb779f8@mail.gmail.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