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Re: good old VACUUM FULL

From: Chris <dmagick(at)gmail(dot)com>
To: pgsql-performance(at)postgresql(dot)org
Subject: Re: good old VACUUM FULL
Date: 2011-03-23 04:24:42
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
On 23/03/11 11:52, felix wrote:
> I posted many weeks ago about a severe problem with a table that was
> obviously bloated and was stunningly slow. Up to 70 seconds just to get
> a row count on 300k rows.
> I removed the text column, so it really was just a few columns of fixed
> data.
> Still very bloated.  Table size was 450M
> The advice I was given was to do CLUSTER, but this did not reduce the
> table size in the least.
> Nor performance.
> Also to resize my free space map (which still does need to be done).
> Since that involves tweaking the kernel settings, taking the site down
> and rebooting postgres and exposing the system to all kinds of risks and
> unknowns and expensive experimentations I was unable to do it and have
> had to hobble along with a slow table in my backend holding up jobs.
> Much swearing that nobody should ever do VACUUM FULL.  Manual advises
> against it.  Only crazy people do that.


> moral of the story:  if your table is really bloated, just do VACUUM FULL

You'll need to reindex that table now - vacuum full can bloat your 
indexes which will affect your other queries.

reindex table fastadder_fastadderstatus;

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