From:
Greg Stark <gsstark(at)mit(dot)edu>
To:
Greg Stark <gsstark(at)MIT(dot)EDU>
Cc:
Neil Conway <neilc(at)samurai(dot)com>,Alvaro Herrera <alvherre(at)surnet(dot)cl>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>,Simon Riggs <simon(at)2ndquadrant(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject:
Re: NOLOGGING option, or ?
Date:
2005-06-01 08:44:24
Message-ID:
874qciv53r.fsf@stark.xeocode.com (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
Greg Stark <gsstark(at)MIT(dot)EDU> writes:
> For CREATE TABLE AS in the non-PITR case you don't really need to WAL log the
> records at all. If it fails in the middle you just drop the table. When it
> completes you do a checkpoint before acknowledging the COMMIT.
>
> I think this is already done for CREATE INDEX/REINDEX, also only in the
> non-PITR case.
Sorry to followup to my own message, but it occurs to me that COPY could be
made to automatically do this for the case of an empty destination table too.
I'm not sure if it should automatically check for an empty table or if there
should be an option for the user to indicate he wants COPY to replace the
current contents entirely. The latter might actually be more useful. .
But either way, you just WAL log a record indicating that the table should be
entirely empty. Then you fill it up without logging anything. Do a checkpoint
and then WAL log that the COPY is finished. If any failure occurs replay
leaves it empty.
Again this sadly only works in the non-PITR case.
--
greg
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