Re: HOT is applied

From: "Pavan Deolasee" <pavan(dot)deolasee(at)gmail(dot)com>
To: "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: "Heikki Linnakangas" <heikki(at)enterprisedb(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: HOT is applied
Date: 2007-09-21 02:59:36
Message-ID: 2e78013d0709201959x7c14a61fkf6ae812b9e4dd5c8@mail.gmail.com
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On 9/21/07, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>
>
> Shouldn't we be able to prune rows that have been inserted and deleted
> by the same transaction? I'd have hoped to see this example use only
> one heap page ...
>
>
Not before the transaction commits ? In the test, we update a single tuple
10000 times in the same transaction. So there is no opportunity to prune.

Thanks,
Pavan

--
Pavan Deolasee
EnterpriseDB http://www.enterprisedb.com

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