Re: CLUSTER and MVCC

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Heikki Linnakangas <heikki(at)enterprisedb(dot)com>, Csaba Nagy <nagy(at)ecircle-ag(dot)com>, postgres hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: CLUSTER and MVCC
Date: 2007-03-22 22:21:53
Message-ID: 200703222221.l2MMLrT08253@momjian.us
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Tom Lane wrote:
> Bruce Momjian <bruce(at)momjian(dot)us> writes:
> > In researching, I found we already do this by updating PGPROC.xid for
> > every command in non-serialzable transactions:
>
> Dunno how you arrived at that conclusion, but it's quite wrong.

Looking in the function I now see you are right:

if (serializable)
MyProc->xmin = TransactionXmin = xmin;

So, can't this be improved to allow more aggressive vacuuming?

--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://www.enterprisedb.com

+ If your life is a hard drive, Christ can be your backup. +

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