Re: HOT for PostgreSQL 8.3

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Hannu Krosing <hannu(at)skype(dot)net>
Cc: Simon Riggs <simon(at)2ndquadrant(dot)com>, pgsql-hackers(at)postgresql(dot)org, Pavan Deolasee <pavan(dot)deolasee(at)enterprisedb(dot)com>, Nikhil S <nikhil(dot)sontakke(at)enterprisedb(dot)com>, Heikki Linnakangas <heikki(at)enterprisedb(dot)com>
Subject: Re: HOT for PostgreSQL 8.3
Date: 2007-02-11 17:35:17
Message-ID: 1856.1171215317@sss.pgh.pa.us
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Hannu Krosing <hannu(at)skype(dot)net> writes:
> What if we would just reuse the root tuple directly instead of turning
> it into a stub ?
> This would create a cycle of ctid pointers, which changes the lookup
> process from 'follow ctid chaint until the end' to 'follow the tid chain
> until you reach the start'.

How do you know which one is newest? What happens when you have to put
a newer version off-page for lack of space?

regards, tom lane

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