From: Stephen Frost <sfrost@snowman.net>
To: Joe Van Dyk <joe@tanga.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: pgsql-performance@postgresql.org <pgsql-performance@postgresql.org>
Subject: Re: Adding an additional join causes very different/slow query plan
Date: Tue, 17 Dec 2013 09:01:28 -0500
Message-ID: <20131217140128.GT2543@tamriel.snowman.net> (raw)
In-Reply-To: <CACfv+pKNEmbQyJPCqRGsVmc_HvRGAi3d_Ge893N8qbX+ymhodA@mail.gmail.com>
References: <CACfv+pJ-NCBHLiHmeiCg_J5eunSavhQCDERRm4ryS8iHrzEdbQ@mail.gmail.com>
<CACfv+p+B56xF-8wbPM+aaY8reZbdkcjOanrz1qYZotnKmTo=ig@mail.gmail.com>
<18828.1387239245@sss.pgh.pa.us>
<CACfv+pKNEmbQyJPCqRGsVmc_HvRGAi3d_Ge893N8qbX+ymhodA@mail.gmail.com>
List-Unsubscribe: <mailto:majordomo@postgresql.org?body=unsub%20pgsql-performance>
* Joe Van Dyk (joe@tanga.com) wrote:
> On Mon, Dec 16, 2013 at 4:14 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> > Yup, that's what I was just about to suggest. You might want to use
> > 10 or 12 in case some of your queries are a bit more complex than
> > this one --- but don't go overboard, or you may find yourself with
> > unreasonable planning time.
> >
>
> Is there a way to measure the planning time? It's not reported in 'explain
> analyze' or 'explain analyze verbose', right?
You can just run 'explain' and that'll more-or-less get you there (turn
on \timing in psql). When reading this thread, I was thinking it might
be useful to add plan time somewhere in explain/explain analyze output
though..
Thanks,
Stephen
Attachments:
signature.asc (application/pgp-signature, 835B) download
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: sfrost@snowman.net, joe@tanga.com, tgl@sss.pgh.pa.us
Subject: Re: Adding an additional join causes very different/slow query plan
In-Reply-To: <20131217140128.GT2543@tamriel.snowman.net>
* 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