From: Tom Lane <tgl@sss.pgh.pa.us>
To: rajan <vgmonnet@gmail.com>
cc: pgsql-admin@postgresql.org
Subject: Re: vacuum full is not reclaiming the space and showing non-removable
 rows
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References: <1479470449084-5930937.post@n3.nabble.com>
Comments: In-reply-to rajan <vgmonnet@gmail.com>
	message dated "Fri, 18 Nov 2016 05:00:49 -0700"
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Date: Fri, 18 Nov 2016 11:01:12 -0500
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rajan <vgmonnet@gmail.com> writes:
> We deleted(using a delete query) a lot of rows from the above table and did
> a vacuum full. But we are not able to reclaim the space(occupied by this
> table) and the result is showing that there are nonremovable rows.

There's an old open transaction somewhere that's possibly still able to
see those rows.  Look for idle sessions in pg_stat_activity.

I don't remember at the moment whether prepared-but-uncommitted
transactions can hold back reclaiming dead data, but look into
pg_prepared_xacts as well.

			regards, tom lane


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