From:
Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To:
Alvaro Herrera <alvherre(at)surnet(dot)cl>
Cc:
Simon Riggs <simon(at)2ndquadrant(dot)com>,Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>, Greg Stark <gsstark(at)mit(dot)edu>,Neil Conway <neilc(at)samurai(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject:
Re: NOLOGGING option, or ?
Date:
2005-06-01 18:24:39
Message-ID:
17405.1117650279@sss.pgh.pa.us (view raw or flat )
Thread:
2005-05-31 23:01:43 from Simon Riggs <simon(at)2ndquadrant(dot)com>
2005-06-01 02:47:30 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2005-06-01 04:40:07 from Alvaro Herrera <alvherre(at)surnet(dot)cl>
2005-06-01 05:00:04 from Neil Conway <neilc(at)samurai(dot)com>
2005-06-01 08:21:39 from Greg Stark <gsstark(at)mit(dot)edu>
2005-06-01 08:44:24 from Greg Stark <gsstark(at)mit(dot)edu>
2005-06-01 12:03:25 from Simon Riggs <simon(at)2ndquadrant(dot)com>
2005-06-01 13:39:07 from Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
2005-06-01 13:58:53 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2005-06-01 14:12:18 from Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
2005-06-01 14:18:25 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2005-06-01 15:21:07 from Simon Riggs <simon(at)2ndquadrant(dot)com>
2005-06-01 15:55:46 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2005-06-01 17:55:46 from Simon Riggs <simon(at)2ndquadrant(dot)com>
2005-06-01 18:10:45 from Alvaro Herrera <alvherre(at)surnet(dot)cl>
2005-06-01 18:24:39 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2005-06-01 20:17:39 from Simon Riggs <simon(at)2ndquadrant(dot)com>
2005-06-01 18:14:27 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2005-06-01 20:33:24 from Simon Riggs <simon(at)2ndquadrant(dot)com>
2005-06-01 22:05:13 from Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
2005-06-01 22:32:32 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2005-06-01 22:47:17 from Simon Riggs <simon(at)2ndquadrant(dot)com>
2005-06-01 23:02:17 from Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
2005-06-01 22:37:51 from Hannu Krosing <hannu(at)tm(dot)ee>
2005-06-01 14:07:37 from Jochem van Dieten <jochemd(at)gmail(dot)com>
2005-06-01 14:14:42 from Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
2005-06-01 15:43:24 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2005-06-01 16:00:28 from Jochem van Dieten <jochemd(at)gmail(dot)com>
2005-06-01 21:27:01 from Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
2005-06-01 08:16:46 from Simon Riggs <simon(at)2ndquadrant(dot)com>
2005-06-01 08:34:38 from Christopher Kings-Lynne <chriskl(at)familyhealth(dot)com(dot)au>
2005-06-01 11:54:19 from Simon Riggs <simon(at)2ndquadrant(dot)com>
2005-06-01 14:01:06 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2005-06-01 09:54:58 from Hannu Krosing <hannu(at)skype(dot)net>
2005-06-01 17:35:30 from "Alon Goldshuv" <agoldshuv(at)greenplum(dot)com>
2005-06-01 21:56:07 from Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
2005-06-01 22:18:41 from "Luke Lonergan" <llonergan(at)greenplum(dot)com>
2005-06-01 22:37:07 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2005-06-02 00:05:29 from "Luke Lonergan" <llonergan(at)greenplum(dot)com>
2005-06-02 01:05:11 from Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
2005-06-02 01:54:51 from "Luke Lonergan" <llonergan(at)greenplum(dot)com>
2005-06-02 02:27:51 from Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
2005-06-02 02:40:06 from "Luke Lonergan" <llonergan(at)greenplum(dot)com>
2005-06-01 23:00:34 from Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
2005-06-01 23:29:30 from "Alon Goldshuv" <agoldshuv(at)greenplum(dot)com>
2005-06-02 01:01:56 from Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
2005-06-02 01:50:23 from "Luke Lonergan" <llonergan(at)greenplum(dot)com>
2005-06-02 02:13:38 from Oliver Jowett <oliver(at)opencloud(dot)com>
2005-06-02 02:28:41 from Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
2005-06-02 02:35:33 from "Luke Lonergan" <llonergan(at)greenplum(dot)com>
2005-06-02 02:47:26 from Steve Atkins <steve(at)blighty(dot)com>
2005-06-02 03:35:57 from "Luke Lonergan" <llonergan(at)greenplum(dot)com>
2005-06-02 05:16:34 from "Luke Lonergan" <llonergan(at)greenplum(dot)com>
2005-06-01 22:39:59 from Simon Riggs <simon(at)2ndquadrant(dot)com>
2005-06-01 23:06:07 from Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
2005-06-01 23:06:09 from Joe Conway <mail(at)joeconway(dot)com>
2005-06-02 03:41:29 from Alvaro Herrera <alvherre(at)surnet(dot)cl>
2005-06-02 16:54:56 from "Alon Goldshuv" <agoldshuv(at)greenplum(dot)com>
2005-06-01 06:25:42 from Hans-Jürgen Schönig <postgres(at)cybertec(dot)at>
2005-06-01 14:43:44 from Dawid Kuroczko <qnex42(at)gmail(dot)com>
2005-06-01 12:10:55 from Hannu Krosing <hannu(at)skype(dot)net>
2005-06-01 15:31:31 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
2005-06-01 16:18:09 from Hannu Krosing <hannu(at)tm(dot)ee>
2005-06-01 17:00:28 from Simon Riggs <simon(at)2ndquadrant(dot)com>
2005-06-01 17:18:55 from Alvaro Herrera <alvherre(at)surnet(dot)cl>
2005-06-01 17:35:25 from Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Lists:
pgsql-hackers
Alvaro Herrera <alvherre(at)surnet(dot)cl> writes:
> On Wed, Jun 01, 2005 at 06:55:46PM +0100, Simon Riggs wrote:
>> We're holding the table lock and will continue to do so until end of
>> transaction. No transaction with an earlier id will ever see the data we
>> load because of the lock.
> Suppose you load half the tuples and the plug is pulled. After
> recovery, you have half-load of tuples that are visible to everyone.
> This is a no-no.
Simon is expecting that the loaded tuples are guaranteed to be erased
(by table truncation) during recovery. As I just noted I'm unconvinced
of the safety of doing truncations during recovery, so I'd prefer not
to depend on that.
The scenario I was thinking of was different: you load pre-frozen
tuples, commit, and thereby release the table lock. Now the tuples
are visible to transactions that started before you did; that's what
violates MVCC.
regards, tom lane
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