From: Gregory Stark <gsstark@mit.edu>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Matteo Sgalaberni <sgala@sgala.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: database bloat, non removovable rows, slow query etc... [RESOLVED]
Date: 04 Sep 2006 18:13:34 -0400
Message-ID: <87ejur1drl.fsf@stark.xeocode.com> (raw)
In-Reply-To: <2191.1157206883@sss.pgh.pa.us>
References: <20060901123915.GT2266@sgala.com>
<4027.1157121810@sss.pgh.pa.us>
<20060901172829.GX2266@sgala.com>
<12756.1157132120@sss.pgh.pa.us>
<20060902083725.GB2266@sgala.com>
<2191.1157206883@sss.pgh.pa.us>
Tom Lane <tgl@sss.pgh.pa.us> writes:
> Matteo Sgalaberni <sgala@sgala.com> writes:
> > Good to know this...but why this behaviour? it'is lovely...:)
>
> Open transactions are tracked across the whole cluster. This is
> necessary when vacuuming shared catalogs. In principle we could
> track per-database xmin values as well, but the distributed overhead
> that'd be added to *every* GetSnapshotData call is a bit worrisome.
Don't we do that now in CVS (ie, in 8.2)?
--
Gregory Stark
EnterpriseDB http://www.enterprisedb.com
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To: pgsql-performance@postgresql.org
Cc: gsstark@mit.edu, tgl@sss.pgh.pa.us, sgala@sgala.com
Subject: Re: database bloat, non removovable rows, slow query etc... [RESOLVED]
In-Reply-To: <87ejur1drl.fsf@stark.xeocode.com>
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