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Re: HOT patch - version 15

From: "Pavan Deolasee" <pavan(dot)deolasee(at)gmail(dot)com>
To: "Bruce Momjian" <bruce(at)momjian(dot)us>
Cc: "Heikki Linnakangas" <heikki(at)enterprisedb(dot)com>, "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "Florian Pflug" <fgp(dot)phlo(dot)org(at)gmail(dot)com>, "Simon Riggs" <simon(at)2ndquadrant(dot)com>, "Gregory Stark" <stark(at)enterprisedb(dot)com>, PostgreSQL-patches <pgsql-patches(at)postgresql(dot)org>
Subject: Re: HOT patch - version 15
Date: 2007-09-10 19:52:00
Message-ID: 2e78013d0709101252p42b79697r3572e6a5f7bb96ea@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-patches
On 9/11/07, Bruce Momjian <bruce(at)momjian(dot)us> wrote:
>
>
>
> Right.  My point is that pruning only modifies item pointers.  It does
> not change the actual heap tuples.  In the quote above, how is Heikki's
> "quick pruning" different from the pruning you are describing?
>
>
>
I think the only difference is that the quick pruning does not mark
intermediate tuples ~LP_USED and hence we may avoid WAL logging.

Btw, I am not too enthusiastic about quick pruning because it leaves
behind dead heap-only tuples which are not reachable from any root
heap tuples. Not that we can't handle them, but I am worried about
making such changes right now unless we are sure about the benefits.
We can always tune and tweak in 8.4

Thanks,
Pavan

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

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Subject: Re: HOT patch - version 15
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