From:
Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To:
Robert Haas <robertmhaas(at)gmail(dot)com>
Cc:
Mark Mielke <mark(at)mark(dot)mielke(dot)cc>, Jeroen Vermeulen <jtv(at)xs4all(dot)nl>,
Alex Hunsaker <badalex(at)gmail(dot)com>, Greg Stark <gsstark(at)mit(dot)edu>,
Bart Samwel <bart(at)samwel(dot)tk>, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>,
pgsql-hackers(at)postgresql(dot)org
Subject:
Re: Avoiding bad prepared-statement plans.
Date:
2010-02-27 00:03:06
Message-ID:
8170.1267228986@sss.pgh.pa.us (view raw or flat )
Thread:
2010-02-09 12:08:54 from Jeroen Vermeulen <jtv(at)xs4all(dot)nl>
2010-02-09 12:59:15 from Yeb Havinga <yebhavinga(at)gmail(dot)com>
2010-02-09 13:46:55 from Jeroen Vermeulen <jtv(at)xs4all(dot)nl>
2010-02-09 14:53:17 from Mark Mielke <mark(at)mark(dot)mielke(dot)cc>
2010-02-10 00:47:18 from Kris Jurka <books(at)ejurka(dot)com>
2010-02-11 03:12:41 from Bruce Momjian <bruce(at)momjian(dot)us>
2010-02-11 04:07:57 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2010-02-09 22:21:43 from Dimitri Fontaine <dfontaine(at)hi-media(dot)com>
2010-02-09 13:50:32 from Richard Huxton <dev(at)archonet(dot)com>
2010-02-09 14:25:19 from Jeroen Vermeulen <jtv(at)xs4all(dot)nl>
2010-02-09 14:45:57 from Richard Huxton <dev(at)archonet(dot)com>
2010-02-09 14:10:22 from Andres Freund <andres(at)anarazel(dot)de>
2010-02-09 14:28:01 from Jeroen Vermeulen <jtv(at)xs4all(dot)nl>
2010-02-09 16:43:52 from Robert Haas <robertmhaas(at)gmail(dot)com>
2010-02-09 16:59:41 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2010-02-11 03:15:01 from Bruce Momjian <bruce(at)momjian(dot)us>
2010-02-11 06:26:15 from Дмитрий Фефелов <fozzy(at)ac-sw(dot)com>
2010-02-11 12:09:33 from Bart Samwel <bart(at)samwel(dot)tk>
2010-02-11 12:25:28 from Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
2010-02-11 12:39:49 from Bart Samwel <bart(at)samwel(dot)tk>
2010-02-11 12:41:12 from Robert Haas <robertmhaas(at)gmail(dot)com>
2010-02-11 12:48:14 from Bart Samwel <bart(at)samwel(dot)tk>
2010-02-11 13:04:46 from Robert Haas <robertmhaas(at)gmail(dot)com>
2010-02-11 16:17:40 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2010-02-11 16:39:11 from Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
2010-02-15 19:11:34 from Bruce Momjian <bruce(at)momjian(dot)us>
2010-02-15 20:03:21 from Robert Haas <robertmhaas(at)gmail(dot)com>
2010-02-15 20:05:29 from Bruce Momjian <bruce(at)momjian(dot)us>
2010-02-16 14:28:57 from Greg Stark <gsstark(at)mit(dot)edu>
2010-02-16 14:31:44 from Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
2010-02-16 20:17:32 from Bruce Momjian <bruce(at)momjian(dot)us>
2010-02-17 03:12:50 from Greg Stark <gsstark(at)mit(dot)edu>
2010-02-15 19:51:26 from Jeroen Vermeulen <jtv(at)xs4all(dot)nl>
2010-02-16 14:22:00 from Greg Stark <gsstark(at)mit(dot)edu>
2010-02-17 22:52:14 from Jeroen Vermeulen <jtv(at)xs4all(dot)nl>
2010-02-21 12:37:50 from Robert Haas <robertmhaas(at)gmail(dot)com>
2010-02-26 02:48:05 from Jeroen Vermeulen <jtv(at)xs4all(dot)nl>
2010-02-26 03:19:21 from Robert Haas <robertmhaas(at)gmail(dot)com>
2010-02-26 03:40:35 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2010-02-26 04:01:14 from Robert Haas <robertmhaas(at)gmail(dot)com>
2010-02-26 04:25:46 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2010-02-28 14:12:32 from Greg Stark <gsstark(at)mit(dot)edu>
2010-02-26 04:28:14 from Alex Hunsaker <badalex(at)gmail(dot)com>
2010-02-26 04:46:20 from Alex Hunsaker <badalex(at)gmail(dot)com>
2010-02-26 05:11:56 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2010-02-26 06:29:41 from Alex Hunsaker <badalex(at)gmail(dot)com>
2010-02-26 15:07:00 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2010-02-26 15:27:30 from Alex Hunsaker <badalex(at)gmail(dot)com>
2010-02-26 16:51:53 from Robert Haas <robertmhaas(at)gmail(dot)com>
2010-02-26 18:11:44 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2010-02-26 16:50:37 from Robert Haas <robertmhaas(at)gmail(dot)com>
2010-02-26 20:02:40 from Alex Hunsaker <badalex(at)gmail(dot)com>
2010-02-26 08:13:31 from Mark Mielke <mark(at)mark(dot)mielke(dot)cc>
2010-02-26 10:20:17 from Jeroen Vermeulen <jtv(at)xs4all(dot)nl>
2010-02-26 14:49:35 from Mark Mielke <mark(at)mark(dot)mielke(dot)cc>
2010-02-26 16:27:11 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2010-02-26 16:54:10 from Robert Haas <robertmhaas(at)gmail(dot)com>
2010-02-26 17:01:59 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2010-02-26 20:11:16 from Yeb Havinga <yebhavinga(at)gmail(dot)com>
2010-02-26 20:29:11 from Mark Mielke <mark(at)mark(dot)mielke(dot)cc>
2010-02-26 20:46:27 from Yeb Havinga <yebhavinga(at)gmail(dot)com>
2010-02-26 22:40:06 from Robert Haas <robertmhaas(at)gmail(dot)com>
2010-02-27 00:03:06 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2010-02-27 00:50:11 from Mark Mielke <mark(at)mark(dot)mielke(dot)cc>
2010-02-28 01:01:43 from Robert Haas <robertmhaas(at)gmail(dot)com>
2010-02-28 04:22:00 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2010-03-01 02:47:38 from Robert Haas <robertmhaas(at)gmail(dot)com>
2010-02-26 18:53:38 from Mark Mielke <mark(at)mark(dot)mielke(dot)cc>
2010-02-26 18:59:22 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2010-02-26 19:22:37 from Mark Mielke <mark(at)mark(dot)mielke(dot)cc>
2010-02-26 19:57:56 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2010-02-26 20:26:05 from Mark Mielke <mark(at)mark(dot)mielke(dot)cc>
2010-02-26 20:47:55 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2010-02-26 19:23:22 from Mark Mielke <mark(at)mark(dot)mielke(dot)cc>
2010-03-01 11:18:01 from Yeb Havinga <yebhavinga(at)gmail(dot)com>
2010-02-28 04:20:38 from Craig Ringer <craig(at)postnewspapers(dot)com(dot)au>
2010-02-28 07:52:55 from Mark Mielke <mark(at)mark(dot)mielke(dot)cc>
2010-03-01 02:51:14 from Robert Haas <robertmhaas(at)gmail(dot)com>
2010-03-02 23:54:28 from Bruce Momjian <bruce(at)momjian(dot)us>
2010-03-03 05:13:46 from Robert Haas <robertmhaas(at)gmail(dot)com>
2010-02-28 08:18:26 from Dimitri Fontaine <dfontaine(at)hi-media(dot)com>
2010-03-02 23:53:56 from Bruce Momjian <bruce(at)momjian(dot)us>
2010-02-18 14:58:25 from "Pierre C" <lists(at)peufeu(dot)com>
2010-02-18 15:09:42 from Dimitri Fontaine <dfontaine(at)hi-media(dot)com>
2010-02-18 16:47:01 from "Pierre C" <lists(at)peufeu(dot)com>
2010-02-18 16:54:31 from Dimitri Fontaine <dfontaine(at)hi-media(dot)com>
2010-02-18 20:19:21 from "Pierre C" <lists(at)peufeu(dot)com>
2010-02-19 02:31:05 from David Christensen <david(at)endpoint(dot)com>
2010-02-19 13:57:51 from Kenneth Marshall <ktm(at)rice(dot)edu>
2010-02-19 17:56:12 from Dimitri Fontaine <dfontaine(at)hi-media(dot)com>
2010-02-11 13:41:02 from Yeb Havinga <yebhavinga(at)gmail(dot)com>
Lists:
pgsql-hackers
Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> Basically, what I really want here is some kind of keyword or other
> syntax that I can stick into a PL/pgsql query that requests a replan
> on every execution.
Wouldn't it be better if it just did the right thing automatically?
The sort of heuristic I'm envisioning would essentially do "replan every
time" for some number of executions, and give up only if it noticed that
it wasn't getting anything better than the generic plan. So you'd have
a fixed maximum overhead per session when the custom plan was useless,
and the Right Thing when it wasn't.
regards, tom lane
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