From:
Alvaro Herrera <alvherre(at)commandprompt(dot)com>
To:
Bruce Momjian <bruce(at)momjian(dot)us>
Cc:
Simon Riggs <simon(at)2ndquadrant(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Noah Misch <noah(at)leadboat(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject:
Re: foreign key locks, 2nd attempt
Date:
2012-03-13 17:35:02
Message-ID:
1331659946-sup-3775@alvh.no-ip.org (view raw or flat )
Thread:
2011-11-03 18:12:49 from Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>
2011-11-06 07:28:52 from Jeroen Vermeulen <jtv(at)xs4all(dot)nl>
2011-11-10 20:17:59 from Christopher Browne <cbbrowne(at)gmail(dot)com>
2011-11-10 20:21:39 from Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
2011-11-10 20:29:44 from "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov>
2011-11-10 20:38:41 from Christopher Browne <cbbrowne(at)gmail(dot)com>
2011-11-11 17:30:18 from David Kerr <dmk(at)mr-paradox(dot)net>
2011-11-12 04:21:10 from Jeroen Vermeulen <jtv(at)xs4all(dot)nl>
2011-11-19 09:21:41 from Simon Riggs <simon(at)2ndQuadrant(dot)com>
2011-11-10 19:59:20 from Bruce Momjian <bruce(at)momjian(dot)us>
2011-11-10 21:09:12 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2011-11-10 21:19:59 from Bruce Momjian <bruce(at)momjian(dot)us>
2011-11-11 22:02:00 from Josh Berkus <josh(at)agliodbs(dot)com>
2011-11-19 09:21:51 from Simon Riggs <simon(at)2ndQuadrant(dot)com>
2011-11-19 15:36:48 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2011-11-21 17:09:06 from Robert Haas <robertmhaas(at)gmail(dot)com>
2011-11-21 20:26:55 from Dimitri Fontaine <dimitri(at)2ndQuadrant(dot)fr>
2011-12-04 12:20:27 from Noah Misch <noah(at)leadboat(dot)com>
2011-12-12 20:20:39 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2011-12-12 21:03:37 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2011-12-13 14:44:49 from Noah Misch <noah(at)leadboat(dot)com>
2011-12-13 16:09:46 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2011-12-13 16:20:10 from Noah Misch <noah(at)leadboat(dot)com>
2011-12-13 21:36:21 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2011-12-14 15:21:29 from Noah Misch <noah(at)leadboat(dot)com>
2011-12-14 15:36:54 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2011-12-16 13:37:16 from Greg Smith <greg(at)2ndQuadrant(dot)com>
2012-02-23 14:15:45 from Simon Riggs <simon(at)2ndQuadrant(dot)com>
2012-02-23 15:04:14 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2012-02-23 15:12:13 from Simon Riggs <simon(at)2ndQuadrant(dot)com>
2012-02-23 15:49:02 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2012-02-23 15:28:20 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2012-02-23 16:01:33 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2012-02-23 16:31:36 from "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov>
2012-02-23 17:45:45 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2012-02-23 18:44:50 from "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov>
2012-02-25 01:06:49 from Vik Reykja <vikreykja(at)gmail(dot)com>
2012-02-25 18:06:38 from "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov>
2012-02-23 18:41:21 from Simon Riggs <simon(at)2ndQuadrant(dot)com>
2012-02-27 02:47:50 from Robert Haas <robertmhaas(at)gmail(dot)com>
2012-03-05 18:28:59 from Simon Riggs <simon(at)2ndQuadrant(dot)com>
2012-03-05 18:37:53 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2012-03-05 19:34:10 from Simon Riggs <simon(at)2ndQuadrant(dot)com>
2012-03-05 19:53:37 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2012-03-05 20:35:15 from Simon Riggs <simon(at)2ndQuadrant(dot)com>
2012-03-06 19:58:22 from Simon Riggs <simon(at)2ndQuadrant(dot)com>
2012-03-06 19:39:32 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2012-03-06 20:28:12 from Simon Riggs <simon(at)2ndQuadrant(dot)com>
2012-03-17 23:11:57 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2012-03-06 21:10:16 from Robert Haas <robertmhaas(at)gmail(dot)com>
2012-03-06 21:27:51 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2012-03-06 21:40:51 from Robert Haas <robertmhaas(at)gmail(dot)com>
2012-03-07 09:24:11 from Gokulakannan Somasundaram <gokul007(at)gmail(dot)com>
2012-03-07 10:02:43 from Simon Riggs <simon(at)2ndQuadrant(dot)com>
2012-03-07 10:18:26 from Gokulakannan Somasundaram <gokul007(at)gmail(dot)com>
2012-03-07 11:11:06 from Simon Riggs <simon(at)2ndQuadrant(dot)com>
2012-03-07 11:37:01 from Gokulakannan Somasundaram <gokul007(at)gmail(dot)com>
2012-03-07 12:16:22 from Simon Riggs <simon(at)2ndQuadrant(dot)com>
2012-03-06 21:33:13 from Simon Riggs <simon(at)2ndQuadrant(dot)com>
2012-03-17 23:01:51 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2012-03-13 17:00:52 from Bruce Momjian <bruce(at)momjian(dot)us>
2012-03-13 17:35:02 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2012-03-16 03:04:06 from Bruce Momjian <bruce(at)momjian(dot)us>
2012-03-16 03:08:29 from Bruce Momjian <bruce(at)momjian(dot)us>
2012-03-16 13:36:11 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2012-03-16 13:40:01 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2012-03-16 18:15:11 from Bruce Momjian <bruce(at)momjian(dot)us>
2012-03-17 22:58:41 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2012-03-12 17:28:11 from Robert Haas <robertmhaas(at)gmail(dot)com>
2012-03-12 17:50:11 from Simon Riggs <simon(at)2ndQuadrant(dot)com>
2012-03-12 18:14:33 from Robert Haas <robertmhaas(at)gmail(dot)com>
2012-03-12 19:28:21 from Simon Riggs <simon(at)2ndquadrant(dot)com>
2012-03-13 17:46:24 from Robert Haas <robertmhaas(at)gmail(dot)com>
2012-03-14 03:42:26 from Noah Misch <noah(at)leadboat(dot)com>
2012-03-14 17:23:14 from Robert Haas <robertmhaas(at)gmail(dot)com>
2012-03-14 22:10:00 from Noah Misch <noah(at)leadboat(dot)com>
2012-03-15 01:17:33 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2012-03-15 02:26:53 from Robert Haas <robertmhaas(at)gmail(dot)com>
2012-03-15 21:38:53 from Simon Riggs <simon(at)2ndQuadrant(dot)com>
2012-03-15 21:54:32 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2012-03-15 22:04:41 from Simon Riggs <simon(at)2ndQuadrant(dot)com>
2012-03-15 22:13:45 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2012-03-15 22:23:32 from Simon Riggs <simon(at)2ndQuadrant(dot)com>
2012-03-15 21:46:44 from Simon Riggs <simon(at)2ndQuadrant(dot)com>
2012-03-15 21:55:05 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2012-03-17 22:45:20 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2012-03-25 08:17:59 from Simon Riggs <simon(at)2ndQuadrant(dot)com>
2012-04-05 18:50:58 from Peter Geoghegan <peter(at)2ndquadrant(dot)com>
2012-03-15 02:15:22 from Robert Haas <robertmhaas(at)gmail(dot)com>
2012-03-15 21:20:38 from Simon Riggs <simon(at)2ndQuadrant(dot)com>
2012-03-15 21:07:28 from Simon Riggs <simon(at)2ndQuadrant(dot)com>
2012-03-16 00:37:36 from Robert Haas <robertmhaas(at)gmail(dot)com>
2012-03-16 00:53:05 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2012-03-16 01:52:12 from Noah Misch <noah(at)leadboat(dot)com>
2012-03-16 03:09:52 from Bruce Momjian <bruce(at)momjian(dot)us>
2012-03-16 14:08:07 from Robert Haas <robertmhaas(at)gmail(dot)com>
2012-03-16 18:22:05 from Bruce Momjian <bruce(at)momjian(dot)us>
2012-03-16 18:49:03 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2012-03-13 01:24:40 from Noah Misch <noah(at)leadboat(dot)com>
2012-03-13 17:09:57 from Robert Haas <robertmhaas(at)gmail(dot)com>
2012-02-27 12:13:32 from Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>
2012-02-28 00:28:14 from Noah Misch <noah(at)leadboat(dot)com>
2012-02-28 07:55:31 from Simon Riggs <simon(at)2ndQuadrant(dot)com>
2012-01-15 04:49:54 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2012-01-16 19:17:42 from Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>
2012-01-16 19:52:36 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2012-01-17 06:21:28 from Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>
2012-01-18 20:18:31 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2012-01-19 02:11:35 from Noah Misch <noah(at)leadboat(dot)com>
2012-01-17 09:56:04 from Noah Misch <noah(at)leadboat(dot)com>
2012-01-17 09:39:13 from Noah Misch <noah(at)leadboat(dot)com>
2012-01-24 18:47:16 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2012-01-26 19:03:02 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2012-01-27 23:47:27 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2012-01-30 23:48:47 from Noah Misch <noah(at)leadboat(dot)com>
2012-01-31 13:17:40 from Robert Haas <robertmhaas(at)gmail(dot)com>
2012-01-31 14:19:57 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2012-01-31 16:18:30 from Robert Haas <robertmhaas(at)gmail(dot)com>
2012-01-31 16:58:21 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2012-01-31 17:12:10 from Robert Haas <robertmhaas(at)gmail(dot)com>
2012-01-31 23:55:19 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2012-02-13 22:16:58 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2012-02-22 17:00:07 from Noah Misch <noah(at)leadboat(dot)com>
2012-02-23 09:18:57 from Simon Riggs <simon(at)2ndQuadrant(dot)com>
2012-02-23 13:08:28 from Jeroen Vermeulen <jtv(at)xs4all(dot)nl>
2012-02-23 14:21:39 from Simon Riggs <simon(at)2ndQuadrant(dot)com>
2012-02-23 21:12:35 from Noah Misch <noah(at)leadboat(dot)com>
2012-02-24 09:38:52 from Jeroen Vermeulen <jtv(at)xs4all(dot)nl>
2012-02-23 15:43:11 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2012-02-23 17:48:13 from Greg Smith <greg(at)2ndQuadrant(dot)com>
2012-02-23 18:04:26 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2012-02-23 18:30:09 from Greg Smith <greg(at)2ndQuadrant(dot)com>
2012-02-24 04:53:34 from Noah Misch <noah(at)leadboat(dot)com>
2012-02-23 21:36:42 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2012-02-23 23:57:47 from Noah Misch <noah(at)leadboat(dot)com>
2012-02-02 00:33:47 from Jim Nasby <jim(at)nasby(dot)net>
2012-02-02 00:58:42 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
Lists:
pgsql-hackers
Excerpts from Bruce Momjian's message of mar mar 13 14:00:52 -0300 2012:
>
> On Tue, Mar 06, 2012 at 04:39:32PM -0300, Alvaro Herrera wrote:
> > When there is a single locker in a tuple, we can just store the locking info
> > in the tuple itself. We do this by storing the locker's Xid in XMAX, and
> > setting hint bits specifying the locking strength. There is one exception
> > here: since hint bit space is limited, we do not provide a separate hint bit
> > for SELECT FOR SHARE, so we have to use the extended info in a MultiXact in
> > that case. (The other cases, SELECT FOR UPDATE and SELECT FOR KEY SHARE, are
> > presumably more commonly used due to being the standards-mandated locking
> > mechanism, or heavily used by the RI code, so we want to provide fast paths
> > for those.)
>
> Are those tuple bits actually "hint" bits? They seem quite a bit more
> powerful than a "hint".
I'm not sure what's your point. We've had a "hint" bit for SELECT FOR
UPDATE for ages. Even 8.2 had HEAP_XMAX_EXCL_LOCK and
HEAP_XMAX_SHARED_LOCK. Maybe they are misnamed and aren't really
"hints", but it's not the job of this patch to fix that problem.
--
Álvaro Herrera <alvherre(at)commandprompt(dot)com>
The PostgreSQL Company - Command Prompt, Inc.
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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