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Re: autovacuum not prioritising for-wraparound tables

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>
Cc: Christopher Browne <cbbrowne(at)gmail(dot)com>, Andres Freund <andres(at)2ndquadrant(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: autovacuum not prioritising for-wraparound tables
Date: 2013-01-31 19:55:06
Message-ID: CA+TgmoZsRi5fO4ByCT3Z2-koUSveubj_awQSDVaa-ELs4wXixw@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-hackers
On Thu, Jan 31, 2013 at 2:36 PM, Alvaro Herrera
<alvherre(at)2ndquadrant(dot)com> wrote:
> Instead, what I propose (and is not really in the patch), as a
> backpatchable item, is an approach in which the functions to compute
> each rel's Browne strength and sort are hooks.  Normal behavior is not
> to sort at all, as currently, and sites that have a problem with the
> current random order can install a custom module that provide hooks to
> change ordering as they see fit.  So behavior won't change for people
> who have no problem today.

Can you think of any examples of cases where we have back-patched a new hook?

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company


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