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

From Gregory Stark
Subject Re: database bloat,non removovable rows, slow query etc... [RESOLVED]
Date
Msg-id 87ejur1drl.fsf@stark.xeocode.com
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In response to Re: database bloat,non removovable rows, slow query etc... [RESOLVED]  (Tom Lane <tgl@sss.pgh.pa.us>)
Responses Re: database bloat,non removovable rows, slow query etc... [RESOLVED]  (Alvaro Herrera <alvherre@commandprompt.com>)
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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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