From:
Alvaro Herrera <alvherre(at)commandprompt(dot)com>
To:
Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc:
"Matthew T(dot) O'Connor" <matthew(at)zeut(dot)net>,
Simon Riggs <simon(at)2ndquadrant(dot)com>,
Heikki Linnakangas <heikki(at)enterprisedb(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:
2007-10-02 14:58:22
Message-ID:
20071002145822.GC5677@alvh.no-ip.org (view raw or flat )
Thread:
2007-09-18 16:51:04 from "Guillaume Smet" <guillaume(dot)smet(at)gmail(dot)com>
2007-09-19 03:30:05 from Decibel! <decibel(at)decibel(dot)org>
2007-09-19 07:08:58 from "Guillaume Smet" <guillaume(dot)smet(at)gmail(dot)com>
2007-09-19 14:53:29 from Decibel! <decibel(at)decibel(dot)org>
2007-09-22 10:06:57 from "Guillaume Smet" <guillaume(dot)smet(at)gmail(dot)com>
2007-09-22 15:38:52 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2007-09-22 16:17:37 from "Guillaume Smet" <guillaume(dot)smet(at)gmail(dot)com>
2007-09-30 18:26:46 from Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc>
2007-10-01 13:58:44 from "Guillaume Smet" <guillaume(dot)smet(at)gmail(dot)com>
2007-10-01 15:44:02 from Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc>
2007-10-01 17:15:08 from Gregory Stark <stark(at)enterprisedb(dot)com>
2007-10-01 17:35:41 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2007-10-01 17:42:41 from Heikki Linnakangas <heikki(at)enterprisedb(dot)com>
2007-10-01 19:59:16 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2007-10-01 20:26:00 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2007-10-01 20:40:21 from "Matthew T(dot) O'Connor" <matthew(at)zeut(dot)net>
2007-10-01 20:50:07 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2007-10-01 21:33:42 from Simon Riggs <simon(at)2ndquadrant(dot)com>
2007-10-01 22:53:40 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2007-10-01 22:56:55 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2007-10-01 23:14:21 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2007-10-02 09:23:12 from Michael Paesold <mpaesold(at)gmx(dot)at>
2007-10-01 23:04:39 from "Matthew T(dot) O'Connor" <matthew(at)zeut(dot)net>
2007-10-01 23:28:02 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2007-10-01 23:35:36 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2007-10-01 23:43:45 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2007-10-01 23:48:27 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2007-10-02 09:19:54 from Michael Paesold <mpaesold(at)gmx(dot)at>
2007-10-02 14:55:00 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2007-10-02 14:58:22 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2007-10-02 15:17:47 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2007-10-03 14:02:28 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2007-10-03 16:42:30 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2007-10-03 23:21:09 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2007-10-04 09:01:41 from Heikki Linnakangas <heikki(at)enterprisedb(dot)com>
2007-10-04 12:53:16 from "Guillaume Smet" <guillaume(dot)smet(at)gmail(dot)com>
2007-10-04 13:04:06 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2007-10-04 15:07:02 from Gregory Stark <stark(at)enterprisedb(dot)com>
2007-10-04 15:10:31 from Simon Riggs <simon(at)2ndquadrant(dot)com>
2007-10-04 15:45:46 from Heikki Linnakangas <heikki(at)enterprisedb(dot)com>
2007-10-04 16:55:57 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2007-10-04 17:30:55 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2007-10-04 18:33:16 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2007-10-04 18:40:46 from Simon Riggs <simon(at)2ndquadrant(dot)com>
2007-10-04 19:32:07 from Simon Riggs <simon(at)2ndquadrant(dot)com>
2007-10-04 21:33:42 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2007-10-05 12:27:54 from Simon Riggs <simon(at)2ndquadrant(dot)com>
2007-10-09 20:10:01 from Simon Riggs <simon(at)2ndquadrant(dot)com>
2007-10-10 03:52:15 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2007-10-10 09:04:34 from Michael Paesold <mpaesold(at)gmx(dot)at>
2007-10-10 09:53:47 from Simon Riggs <simon(at)2ndquadrant(dot)com>
2007-10-10 10:17:43 from "Heikki Linnakangas" <heikki(at)enterprisedb(dot)com>
2007-10-10 10:48:56 from Simon Riggs <simon(at)2ndquadrant(dot)com>
2007-10-11 19:59:08 from Michael Paesold <mpaesold(at)gmx(dot)at>
2007-10-11 20:22:46 from Simon Riggs <simon(at)2ndquadrant(dot)com>
2007-10-12 05:24:29 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2007-10-12 06:17:51 from Simon Riggs <simon(at)2ndquadrant(dot)com>
2007-10-12 06:40:25 from Simon Riggs <simon(at)2ndquadrant(dot)com>
2007-10-12 07:23:57 from Deblauwe Gino <gino(at)useitgroup(dot)com>
2007-10-12 09:08:21 from Michael Paesold <mpaesold(at)gmx(dot)at>
2007-10-12 14:19:57 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2007-10-12 15:02:02 from Simon Riggs <simon(at)2ndquadrant(dot)com>
2007-10-12 15:26:20 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2007-10-12 16:32:47 from Simon Riggs <simon(at)2ndquadrant(dot)com>
2007-10-12 16:42:48 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2007-10-12 17:30:30 from Simon Riggs <simon(at)2ndquadrant(dot)com>
2007-10-12 17:51:42 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2007-10-12 18:16:55 from Simon Riggs <simon(at)2ndquadrant(dot)com>
2007-10-12 09:44:20 from Michael Paesold <mpaesold(at)gmx(dot)at>
2007-10-12 11:00:54 from Simon Riggs <simon(at)2ndquadrant(dot)com>
2007-10-12 12:27:31 from Deblauwe Gino <gino(at)useitgroup(dot)com>
2007-10-04 18:42:10 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2007-10-11 13:57:22 from Gregory Stark <stark(at)enterprisedb(dot)com>
2007-10-04 14:27:52 from Simon Riggs <simon(at)2ndquadrant(dot)com>
2007-10-04 14:43:16 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2007-10-04 15:03:00 from Simon Riggs <simon(at)2ndquadrant(dot)com>
2007-10-01 15:57:03 from "Guillaume Smet" <guillaume(dot)smet(at)gmail(dot)com>
Lists:
pgsql-hackers
Tom Lane escribió:
> I wrote:
> > Actually, if you wanted a low-hanging solution to that, it would
> > probably be to revert this 8.2 patch:
> > http://archives.postgresql.org/pgsql-committers/2006-09/msg00284.php
>
> Uh ... never mind, that won't help at all. Reducing the lock taken for
> ANALYZE could allow CREATE INDEX (ShareLock) to run concurrently. But
> ALTER TABLE wants AccessExclusive lock, and no amount of fine-tuning of
> the conflicting lock will help.
>
> It might be possible to solve this if we reduce the strength of the lock
> used for ALTER TABLE. We'd have to go through all the commands
> potentially issued by a pg_dump script and see if they could all be made
> to run concurrently with autovac, which is a bit nervous-making but
> might be feasible; and I'm afraid tablecmds.c would need some
> restructuring to not use the same lock type for every variant of ALTER.
> But it seems like a path worth investigating.
Right. Are you going to work on it, or do you want me to propose a
patch?
--
Alvaro Herrera http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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