Re: Slowing UPDATEs inside a transaction

From: Matt Burke <mattblists(at)icritical(dot)com>
To: Robert Haas <robertmhaas(at)gmail(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: Slowing UPDATEs inside a transaction
Date: 2011-03-04 09:21:54
Message-ID: 4D70AF32.7020706@icritical.com
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Robert Haas wrote:
> Old row versions have to be kept around until they're no longer of
> interest to any still-running transaction.

Thanks for the explanation.

Regarding the snippet above, why would the intermediate history of
multiply-modified uncommitted rows be of interest to anything, or is the
current behaviour simply "cheaper" overall in terms of cpu/developer time?

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