From: David Kerr <dmk@mr-paradox.net>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: pgsql-performance@postgresql.org
Subject: Re: Drop statistics?
Date: Fri, 22 Jun 2012 11:04:36 -0700
Message-ID: <20120622180436.GB94572@mr-paradox.net> (raw)
In-Reply-To: <14312.1340386071@sss.pgh.pa.us>
References: <20120622170755.GB93663@mr-paradox.net>
<14312.1340386071@sss.pgh.pa.us>
On Fri, Jun 22, 2012 at 01:27:51PM -0400, Tom Lane wrote:
- David Kerr <dmk@mr-paradox.net> writes:
- > I'm trying to work through a root cause on a performance problem. I'd like to
- > be able to "show" that a problem was fixed by analyzing the table.
-
- > what i've done is
- > set default_statistics_target=1
- > analyze <Table>
-
- > That gets rid of most of the rows in pg_stats, but i'm still getting decent performance.
-
- I usually do something like
-
- DELETE FROM pg_statistic WHERE starelid = 'foo'::regclass;
-
- (you need to be superuser to be allowed to do this).
-
- You may need to keep an eye on whether auto-analyze is coming along and
- undoing what you did, too.
-
- regards, tom lane
-
Awesome, thanks!
Dave
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: dmk@mr-paradox.net, tgl@sss.pgh.pa.us
Subject: Re: Drop statistics?
In-Reply-To: <20120622180436.GB94572@mr-paradox.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