From:
Robert Haas <robertmhaas(at)gmail(dot)com>
To:
Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc:
Marko Tiikkaja <marko(dot)tiikkaja(at)cs(dot)helsinki(dot)fi>, Steve Singer <ssinger_pg(at)sympatico(dot)ca>, pgsql-hackers(at)postgresql(dot)org, Alvaro Herrera <alvherre(at)commandprompt(dot)com>
Subject:
Re: Review: Fix snapshot taking inconsistencies
Date:
2011-02-28 18:58:17
Message-ID:
AANLkTimAYWz36fGpXTmWUZXr0QGYawzb5G-z-q2jmTAp@mail.gmail.com (view raw or flat )
Thread:
2010-10-03 02:08:40 from Steve Singer <ssinger_pg(at)sympatico(dot)ca>
2010-10-03 22:27:06 from Marko Tiikkaja <marko(dot)tiikkaja(at)cs(dot)helsinki(dot)fi>
2010-10-04 03:19:56 from Steve Singer <ssinger_pg(at)sympatico(dot)ca>
2010-10-04 09:28:05 from Marko Tiikkaja <marko(dot)tiikkaja(at)cs(dot)helsinki(dot)fi>
2010-10-04 14:31:26 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2010-10-08 23:07:25 from Marko Tiikkaja <marko(dot)tiikkaja(at)cs(dot)helsinki(dot)fi>
2010-10-20 19:33:12 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2010-10-20 21:59:32 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2010-10-20 22:15:43 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2011-01-30 22:53:39 from Robert Haas <robertmhaas(at)gmail(dot)com>
2010-10-07 02:21:51 from Steve Singer <ssinger_pg(at)sympatico(dot)ca>
2010-10-10 11:48:17 from Marko Tiikkaja <marko(dot)tiikkaja(at)cs(dot)helsinki(dot)fi>
2010-10-12 00:50:25 from Steve Singer <ssinger_pg(at)sympatico(dot)ca>
2010-10-12 22:21:32 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2010-10-12 22:36:30 from Marko Tiikkaja <marko(dot)tiikkaja(at)cs(dot)helsinki(dot)fi>
2010-10-12 23:10:08 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2010-10-12 23:33:44 from Marko Tiikkaja <marko(dot)tiikkaja(at)cs(dot)helsinki(dot)fi>
2010-10-12 23:49:28 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2010-10-17 03:15:07 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2010-10-21 12:32:54 from Marko Tiikkaja <marko(dot)tiikkaja(at)cs(dot)helsinki(dot)fi>
2011-01-15 20:30:14 from Marko Tiikkaja <marko(dot)tiikkaja(at)cs(dot)helsinki(dot)fi>
2011-02-23 20:27:29 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2011-02-23 22:39:23 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2011-02-23 22:48:38 from Marko Tiikkaja <marko(dot)tiikkaja(at)cs(dot)helsinki(dot)fi>
2011-02-24 00:31:21 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2011-02-24 00:38:05 from Marko Tiikkaja <marko(dot)tiikkaja(at)cs(dot)helsinki(dot)fi>
2011-02-24 15:21:41 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2011-02-24 15:57:27 from Marko Tiikkaja <marko(dot)tiikkaja(at)cs(dot)helsinki(dot)fi>
2011-02-24 16:02:57 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2011-02-26 05:09:31 from Robert Haas <robertmhaas(at)gmail(dot)com>
2011-02-26 05:15:58 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2011-02-24 00:35:13 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2011-02-24 00:39:23 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2011-02-24 00:52:42 from Marko Tiikkaja <marko(dot)tiikkaja(at)cs(dot)helsinki(dot)fi>
2011-02-24 15:06:17 from Alvaro Herrera <alvherre(at)commandprompt(dot)com>
2011-02-28 18:22:45 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2011-02-28 18:30:14 from Robert Haas <robertmhaas(at)gmail(dot)com>
2011-02-28 18:45:04 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2011-02-28 18:58:17 from Robert Haas <robertmhaas(at)gmail(dot)com>
2011-02-28 19:01:15 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2011-02-28 19:14:59 from Robert Haas <robertmhaas(at)gmail(dot)com>
2011-02-28 18:59:05 from Marko Tiikkaja <marko(dot)tiikkaja(at)cs(dot)helsinki(dot)fi>
2011-02-28 19:03:43 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2011-02-28 19:18:55 from Marko Tiikkaja <marko(dot)tiikkaja(at)cs(dot)helsinki(dot)fi>
2011-02-28 19:36:10 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2011-02-28 19:39:17 from Marko Tiikkaja <marko(dot)tiikkaja(at)cs(dot)helsinki(dot)fi>
2011-03-01 04:29:46 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Lists:
pgsql-hackers
On Mon, Feb 28, 2011 at 1:45 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Robert Haas <robertmhaas(at)gmail(dot)com> writes:
>> On Mon, Feb 28, 2011 at 1:22 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>>> So: exactly what is the intended behavioral change as of now, and what
>>> is the argument supporting that change?
>
>> IIUC, this is the result of countless rounds of communal bikeshedding around:
>
> Quite :-(. But I'm not sure where the merry-go-round stopped.
>
>> http://archives.postgresql.org/pgsql-hackers/2010-07/msg01256.php
>
> Please notice that the very terms of discussion in that message depend
> on a view of wCTEs that has got nothing to do with what was applied.
> I'm afraid that the goals of this patch might be similarly obsolete.
No, I don't think so. IIUC, the problem is that EXPLAIN ANALYZE runs
the rewrite products with different snapshot handling than the regular
execution path. So in theory you could turn on auto_explain and have
the semantics of your queries change. That would be Bad.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
In response to
Responses
pgsql-hackers by date
Next :From: Robert HaasDate: 2011-02-28 18:59:02Subject : Re: knngist - 0.8Previous :From : Robert HaasDate : 2011-02-28 18:54:23Subject : Re: Why our counters need to be time-based WAS: WIP: cross
column correlation ...
