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Re: database bloat,non removovable rows, slow query etc... [RESOLVED] - Mailing list pgsql-performance

From Tom Lane
Subject Re: database bloat,non removovable rows, slow query etc... [RESOLVED]
Date
Msg-id 2191.1157206883@sss.pgh.pa.us
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In response to Re: database bloat,non removovable rows, slow query etc... [RESOLVED]  (Matteo Sgalaberni <sgala@sgala.com>)
Responses Re: database bloat,non removovable rows, slow query etc... [RESOLVED]
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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.

            regards, tom lane

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