From: Michael Riess <mlriess@gmx.de>
To: pgsql-performance@postgresql.org
Subject: Re: Autovacuum / full vacuum
Date: Tue, 17 Jan 2006 15:33:18 +0100
Message-ID: <dqiv77$2ijp$1@news.hub.org> (raw)
In-Reply-To: <43CCFA7E.1060307@zeut.net>
References: <dqigaf$1b98$1@news.hub.org>
<43CCC711.504@familyhealth.com.au>
<dqih4p$1clg$1@news.hub.org>
<43CCFA7E.1060307@zeut.net>
Hi,
yes, some heavily used tables contain approx. 90% free space after a
week. I'll try to increase FSM even more, but I think that I will still
have to run a full vacuum every week. Prior to 8.1 I was using 7.4 and
ran a full vacuum every day, so the autovacuum has helped a lot.
But actually I never understood why the database system slows down at
all when there is much unused space in the files. Are the unused pages
cached by the system, or is there another reason for the impact on the
performance?
Mike
> Have you measured to see if things are truly
> faster after a VACUUM FULL?
>
> Matt
>
> ---------------------------(end of broadcast)---------------------------
> TIP 6: explain analyze is your friend
>
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: mlriess@gmx.de
Subject: Re: Autovacuum / full vacuum
In-Reply-To: <dqiv77$2ijp$1@news.hub.org>
* 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