From: | Bruce Momjian <bruce(at)momjian(dot)us> |
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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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Lists: | pgsql-hackers |
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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