Re: database bloat, non removovable rows, slow query etc... [RESOLVED]

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Matteo Sgalaberni <sgala(at)sgala(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: database bloat, non removovable rows, slow query etc... [RESOLVED]
Date: 2006-09-02 14:21:23
Message-ID: 2191.1157206883@sss.pgh.pa.us
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Matteo Sgalaberni <sgala(at)sgala(dot)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.

regards, tom lane

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