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Re: First steps with 8.3 and autovacuum launcher

From: Heikki Linnakangas <heikki(at)enterprisedb(dot)com>
To: Alvaro Herrera <alvherre(at)commandprompt(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "Matthew T(dot) O'Connor" <matthew(at)zeut(dot)net>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Gregory Stark <stark(at)enterprisedb(dot)com>, Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc>, Guillaume Smet <guillaume(dot)smet(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: First steps with 8.3 and autovacuum launcher
Date: 2007-10-04 09:01:41
Message-ID: 4704ABF5.80500@enterprisedb.com (view raw or flat)
Thread:
Lists: pgsql-hackers
Alvaro Herrera wrote:
> I came up with the following patch.  What this does is cancel any
> ANALYZE started by autovacuum, at the top of ALTER TABLE.

There's a small race condition, autoanalyze could start between the
calls autovac_cancel_analyze and relation_open.

And it doesn't solve the problem for autovacuum. Or other commands than
ALTER TABLE, like CLUSTER.

> There is a new function relation_openrv_cav().  This is the same as
> relation_openrv, except that it will also cancel analyzes.  I'm still
> wondering if I should merge the two and have a third boolean argument to
> specify whether to do the cancel.

I like it better the way you have it now.

-- 
  Heikki Linnakangas
  EnterpriseDB   http://www.enterprisedb.com

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