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Re: Not HOT enough

From: Alvaro Herrera <alvherre(at)commandprompt(dot)com>
To: Robert Haas <robertmhaas(at)gmail(dot)com>
Cc: Simon Riggs <simon(at)2ndquadrant(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Not HOT enough
Date: 2011-11-23 15:20:44
Message-ID: 1322061559-sup-6871@alvh.no-ip.org (view raw or flat)
Thread:
Lists: pgsql-hackers
Excerpts from Robert Haas's message of mié nov 23 12:15:55 -0300 2011:

> > And it effects shared catalogs only, which are all low traffic anyway.
> 
> I think "low traffic" is the key point.  I understand that you're not
> changing the VACUUM behavior, but you are making heap_page_prune_opt()
> not do anything when a shared catalog is involved.  That would be
> unacceptable if we expected shared catalogs to be updated frequently,
> either now or in the future, but I guess we don't expect that.

Maybe not pg_database or pg_tablespace and such, but I'm not so sure
about pg_shdepend.  (Do we record pg_shdepend entries for temp tables?)

-- 
Álvaro Herrera <alvherre(at)commandprompt(dot)com>
The PostgreSQL Company - Command Prompt, Inc.
PostgreSQL Replication, Consulting, Custom Development, 24x7 support

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