From:
Greg Stark <gsstark(at)mit(dot)edu>
To:
"Jim C(dot) Nasby" <jnasby(at)pervasive(dot)com>
Cc:
Simon Riggs <simon(at)2ndquadrant(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Qingqing Zhou <zhouqq(at)cs(dot)toronto(dot)edu>, pgsql-hackers(at)postgresql(dot)org
Subject:
Re: Stats collector performance improvement
Date:
2006-01-03 23:28:34
Message-ID:
878xtw6gd9.fsf@stark.xeocode.com (view raw or flat )
Thread:
2005-12-12 18:33:27 from "Merlin Moncure" <merlin(dot)moncure(at)rcsonline(dot)com>
2005-12-12 18:50:16 from Michael Fuhr <mike(at)fuhr(dot)org>
2005-12-12 23:01:01 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2005-12-13 01:07:51 from Michael Fuhr <mike(at)fuhr(dot)org>
2005-12-13 03:20:45 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2005-12-15 23:44:48 from Michael Fuhr <mike(at)fuhr(dot)org>
2005-12-16 00:06:39 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2005-12-16 05:44:58 from Kevin Brown <kevin(at)sysexperts(dot)com>
2005-12-16 13:17:25 from Simon Riggs <simon(at)2ndquadrant(dot)com>
2005-12-17 02:44:19 from Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
2006-01-02 18:40:40 from Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
2006-01-02 18:45:21 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2006-01-02 19:13:47 from Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
2006-01-02 20:20:24 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2006-01-02 21:03:20 from "Qingqing Zhou" <zhouqq(at)cs(dot)toronto(dot)edu>
2006-01-02 21:48:45 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2006-01-03 09:40:53 from Simon Riggs <simon(at)2ndquadrant(dot)com>
2006-01-03 16:35:56 from "Jim C(dot) Nasby" <jnasby(at)pervasive(dot)com>
2006-01-03 23:28:34 from Greg Stark <gsstark(at)mit(dot)edu>
2006-01-03 21:42:53 from Hannu Krosing <hannu(at)skype(dot)net>
2006-01-08 16:49:12 from Greg Stark <gsstark(at)mit(dot)edu>
2006-01-09 15:48:21 from Hannu Krosing <hannu(at)skype(dot)net>
2006-01-02 21:48:15 from Hannu Krosing <hannu(at)skype(dot)net>
2006-01-03 04:06:57 from Jan Wieck <JanWieck(at)Yahoo(dot)com>
2006-01-03 09:54:57 from Simon Riggs <simon(at)2ndquadrant(dot)com>
2006-01-03 16:43:23 from Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
2006-01-05 00:39:42 from Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
2006-06-15 04:05:38 from Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
2006-06-15 06:09:43 from "Qingqing Zhou" <zhouqq(at)cs(dot)toronto(dot)edu>
2006-06-15 14:27:33 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2006-06-15 15:57:36 from Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
2006-06-15 21:38:01 from Josh Berkus <josh(at)agliodbs(dot)com>
2006-06-15 21:42:16 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2006-06-15 21:46:29 from Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
2006-06-16 01:34:12 from "Qingqing Zhou" <zhouqq(at)cs(dot)toronto(dot)edu>
2006-06-16 01:56:34 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2006-06-16 03:14:06 from Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
2006-06-16 03:27:50 from "Qingqing Zhou" <zhouqq(at)cs(dot)toronto(dot)edu>
2006-06-16 03:57:22 from Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
2006-06-16 04:48:27 from "Qingqing Zhou" <zhouqq(at)cs(dot)toronto(dot)edu>
2006-06-16 16:03:22 from Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
2006-06-16 16:12:50 from Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc>
2006-06-16 16:24:03 from Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
2006-06-16 18:14:47 from Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc>
2006-06-17 17:43:06 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2006-06-15 08:00:27 from "Larry Rosenman" <ler(at)lerctr(dot)org>
2006-06-15 19:58:27 from Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc>
2006-06-15 20:29:36 from Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc>
Lists:
pgsql-hackers pgsql-patches pgsql-performance
"Jim C. Nasby" <jnasby(at)pervasive(dot)com> writes:
> I would argue that minutes is too long, but of course this could be
> user-adjustable. I suspect that even waiting just a second could be a
> huge win, since this only matters if you're executing a lot of
> statements and you won't be doing that if those statements are taking
> more than a second or two to execute.
That's not necessarily true at all. You could just as easily have a
performance problem caused by a quick statement that is being executed many
times as a slow statement that is being executed few times.
That is, you could be executing dozens of queries that take seconds or minutes
once a second but none of those might be the problem. The problem might be the
query that's taking only 300ms that you're executing hundreds of of times a
minute.
Moreover, if you're not gathering stats for queries that are fast then how
will you know whether they're performing properly when you look at them when
they do show up?
--
greg
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