Remove duplicate emails.
This commit is contained in:
Bruce Momjian
parent
3a272cf032
commit
8805c835c8
@ -16,7 +16,7 @@ In-Reply-To: <200206210158.g5L1wFk20118@candle.pha.pa.us>
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Message-ID: <Pine.NEB.4.43.0206211106390.437-100000@angelic.cynic.net>
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MIME-Version: 1.0
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Content-Type: TEXT/PLAIN; charset=US-ASCII
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Status: OR
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Status: RO
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On Thu, 20 Jun 2002, Bruce Momjian wrote:
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@ -98,7 +98,7 @@ In-Reply-To: <19332.1024668861@sss.pgh.pa.us>
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Message-ID: <Pine.NEB.4.43.0206221731130.1091-100000@angelic.cynic.net>
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MIME-Version: 1.0
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Content-Type: TEXT/PLAIN; charset=US-ASCII
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Status: OR
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Status: RO
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On Fri, 21 Jun 2002, Tom Lane wrote:
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@ -186,7 +186,7 @@ X-Mailer: Ximian Evolution 1.0.3 (1.0.3-6)
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Date: 22 Jun 2002 18:22:58 -0400
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Precedence: bulk
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Sender: pgsql-hackers-owner@postgresql.org
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Status: ORr
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Status: ROr
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On Thu, 2002-06-20 at 21:58, Bruce Momjian wrote:
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> I was wondering, how does knowing the block is corrupt help MS SQL?
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@ -287,7 +287,7 @@ Message-ID: <1024835880.1793.264.camel@localhost.localdomain>
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MIME-Version: 1.0
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Precedence: bulk
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Sender: pgsql-hackers-owner@postgresql.org
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Status: OR
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Status: RO
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On Sat, 2002-06-22 at 19:17, Bruce Momjian wrote:
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> J. R. Nield wrote:
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@ -346,84 +346,6 @@ TIP 6: Have you searched our list archives?
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http://archives.postgresql.org
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From jrnield@usol.com Sun Jun 23 08:37:30 2002
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Return-path: <jrnield@usol.com>
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Received: from hades.usol.com (IDENT:root@hades.usol.com [208.232.58.41])
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by candle.pha.pa.us (8.11.6/8.10.1) with ESMTP id g5NCbRF28741
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for <pgman@candle.pha.pa.us>; Sun, 23 Jun 2002 08:37:28 -0400 (EDT)
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Received: from 08-032.024.popsite.net (08-032.024.popsite.net [66.19.4.32])
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by hades.usol.com (8.11.6/8.11.6) with ESMTP id g5NCbNj02111;
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Sun, 23 Jun 2002 08:37:23 -0400
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Subject: Re: [HACKERS] Index Scans become Seq Scans after VACUUM ANALYSE
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From: "J. R. Nield" <jrnield@usol.com>
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To: Bruce Momjian <pgman@candle.pha.pa.us>
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cc: Curt Sampson <cjs@cynic.net>, Michael Loftis <mloftis@wgops.com>,
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mlw
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<markw@mohawksoft.com>,
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PostgreSQL Hacker <pgsql-hackers@postgresql.org>,
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Tom Lane <tgl@sss.pgh.pa.us>
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In-Reply-To: <200206222317.g5MNHBn23427@candle.pha.pa.us>
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References: <200206222317.g5MNHBn23427@candle.pha.pa.us>
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Content-Type: text/plain
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Content-Transfer-Encoding: 7bit
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X-Mailer: Ximian Evolution 1.0.3 (1.0.3-6)
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Date: 23 Jun 2002 08:37:53 -0400
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Message-ID: <1024835880.1793.264.camel@localhost.localdomain>
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MIME-Version: 1.0
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Status: OR
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On Sat, 2002-06-22 at 19:17, Bruce Momjian wrote:
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> J. R. Nield wrote:
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> > One other point:
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> >
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> > Page pre-image logging is fundamentally the same as what Jim Grey's
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> > book[1] would call "careful writes". I don't believe they should be in
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> > the XLOG, because we never need to keep the pre-images after we're sure
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> > the buffer has made it to the disk. Instead, we should have the buffer
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> > IO routines implement ping-pong writes of some kind if we want
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> > protection from partial writes.
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>
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> Ping-pong writes to where? We have to fsync, and rather than fsync that
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> area and WAL, we just do WAL. Not sure about a win there.
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>
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The key question is: do we have some method to ensure that the OS
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doesn't do the writes in parallel?
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If the OS will ensure that one of the two block writes of a ping-pong
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completes before the other starts, then we don't need to fsync() at
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all.
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The only thing we are protecting against is the possibility of both
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writes being partial. If neither is done, that's fine because WAL will
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protect us. If the first write is partial, we will detect that and use
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the old data from the other, then recover from WAL. If the first is
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complete but the second is partial, then we detect that and use the
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newer block from the first write. If the second is complete but the
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first is partial, we detect that and use the newer block from the second
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write.
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So does anyone know a way to prevent parallel writes in one of the
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common unix standards? Do they say anything about this?
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It would seem to me that if the same process does both ping-pong writes,
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then there should be a cheap way to enforce a serial order. I could be
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wrong though.
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As to where the first block of the ping-pong should go, maybe we could
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reserve a file with nBlocks space for them, and write the information
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about which block was being written to the XLOG for use in recovery.
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There are many other ways to do it.
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;jrnield
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--
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J. R. Nield
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jrnield@usol.com
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From cjs@cynic.net Sun Jun 23 09:33:29 2002
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Return-path: <cjs@cynic.net>
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Received: from academic.cynic.net (academic.cynic.net [63.144.177.3])
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@ -444,7 +366,7 @@ In-Reply-To: <1024835880.1793.264.camel@localhost.localdomain>
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Message-ID: <Pine.NEB.4.43.0206232223300.2100-100000@angelic.cynic.net>
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MIME-Version: 1.0
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Content-Type: TEXT/PLAIN; charset=US-ASCII
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Status: OR
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Status: RO
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On 23 Jun 2002, J. R. Nield wrote:
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@ -528,7 +450,7 @@ Message-ID: <8461.1024845555@sss.pgh.pa.us>
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From: Tom Lane <tgl@sss.pgh.pa.us>
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Precedence: bulk
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Sender: pgsql-hackers-owner@postgresql.org
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Status: OR
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Status: RO
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Curt Sampson <cjs@cynic.net> writes:
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> This should also allow us to disable completely the ping-pong writes
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@ -573,7 +495,7 @@ In-Reply-To: <8461.1024845555@sss.pgh.pa.us>
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Message-ID: <Pine.NEB.4.43.0206240057070.2100-100000@angelic.cynic.net>
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MIME-Version: 1.0
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Content-Type: TEXT/PLAIN; charset=US-ASCII
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Status: OR
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Status: RO
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On Sun, 23 Jun 2002, Tom Lane wrote:
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@ -649,7 +571,7 @@ X-Mailer: Ximian Evolution 1.0.3 (1.0.3-6)
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Date: 23 Jun 2002 13:57:19 -0400
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Message-ID: <1024855044.1793.414.camel@localhost.localdomain>
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MIME-Version: 1.0
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Status: ORr
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Status: ROr
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On Sun, 2002-06-23 at 11:19, Tom Lane wrote:
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> Curt Sampson <cjs@cynic.net> writes:
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@ -747,7 +669,7 @@ In-Reply-To: <1024855044.1793.414.camel@localhost.localdomain>
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Message-ID: <Pine.NEB.4.43.0206240307550.511-100000@angelic.cynic.net>
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MIME-Version: 1.0
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Content-Type: TEXT/PLAIN; charset=US-ASCII
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Status: ORr
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Status: ROr
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On 23 Jun 2002, J. R. Nield wrote:
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@ -805,7 +727,7 @@ X-Mailer: Ximian Evolution 1.0.3 (1.0.3-6)
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Date: 23 Jun 2002 14:15:17 -0400
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Message-ID: <1024856120.3054.418.camel@localhost.localdomain>
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MIME-Version: 1.0
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Status: OR
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Status: RO
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On Sun, 2002-06-23 at 12:10, Curt Sampson wrote:
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>
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@ -864,7 +786,7 @@ Sender: pgsql-hackers-owner@postgresql.org
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X-Spam-Status: No, hits=-3.4 required=5.0
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tests=IN_REP_TO
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version=2.30
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Status: OR
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Status: RO
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J. R. Nield wrote:
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> So since we have all this buffering designed especially to meet our
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@ -943,7 +865,7 @@ Sender: pgsql-hackers-owner@postgresql.org
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X-Spam-Status: No, hits=-3.4 required=5.0
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tests=IN_REP_TO
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version=2.30
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Status: OR
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Status: RO
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Curt Sampson wrote:
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> On 23 Jun 2002, J. R. Nield wrote:
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@ -1016,7 +938,7 @@ In-Reply-To: <200206231936.g5NJasa07642@candle.pha.pa.us>
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Message-ID: <Pine.NEB.4.43.0206240907160.511-100000@angelic.cynic.net>
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MIME-Version: 1.0
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Content-Type: TEXT/PLAIN; charset=US-ASCII
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Status: OR
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Status: RO
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On Sun, 23 Jun 2002, Bruce Momjian wrote:
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@ -1063,7 +985,7 @@ X-Mailer: Ximian Evolution 1.0.3 (1.0.3-6)
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Date: 23 Jun 2002 21:29:23 -0400
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Message-ID: <1024882167.1793.733.camel@localhost.localdomain>
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MIME-Version: 1.0
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Status: ORr
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Status: ROr
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On Sun, 2002-06-23 at 15:36, Bruce Momjian wrote:
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> Yes, I don't see writing to two files vs. one to be any win, especially
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@ -1188,7 +1110,7 @@ Sender: pgsql-hackers-owner@postgresql.org
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X-Spam-Status: No, hits=-3.4 required=5.0
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tests=IN_REP_TO
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version=2.30
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Status: OR
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Status: RO
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J. R. Nield wrote:
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> On Sun, 2002-06-23 at 15:36, Bruce Momjian wrote:
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@ -1336,7 +1258,7 @@ In-Reply-To: <1024882167.1793.733.camel@localhost.localdomain>
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Message-ID: <Pine.NEB.4.43.0206241150500.7326-100000@angelic.cynic.net>
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MIME-Version: 1.0
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Content-Type: TEXT/PLAIN; charset=US-ASCII
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Status: OR
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Status: RO
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On 23 Jun 2002, J. R. Nield wrote:
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@ -1556,7 +1478,7 @@ Sender: pgsql-hackers-owner@postgresql.org
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X-Spam-Status: No, hits=-5.3 required=5.0
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tests=IN_REP_TO,X_NOT_PRESENT
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version=2.30
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Status: OR
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Status: RO
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> On Sun, 23 Jun 2002, Bruce Momjian wrote:
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>> Yes, I don't see writing to two files vs. one to be any win, especially
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@ -1636,7 +1558,7 @@ Sender: pgsql-hackers-owner@postgresql.org
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X-Spam-Status: No, hits=-3.4 required=5.0
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tests=IN_REP_TO
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version=2.30
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Status: OR
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Status: RO
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Tom Lane wrote:
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> > On Sun, 23 Jun 2002, Bruce Momjian wrote:
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@ -1718,7 +1640,7 @@ Sender: pgsql-hackers-owner@postgresql.org
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X-Spam-Status: No, hits=-5.3 required=5.0
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tests=IN_REP_TO,X_NOT_PRESENT
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version=2.30
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Status: OR
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Status: RO
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Bruce Momjian <pgman@candle.pha.pa.us> writes:
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>> The only thing I've been able to think of that seems like it might
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@ -1771,7 +1693,7 @@ X-Mailer: Ximian Evolution 1.0.3 (1.0.3-6)
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Date: 24 Jun 2002 16:49:42 -0400
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Message-ID: <1024951786.1793.865.camel@localhost.localdomain>
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MIME-Version: 1.0
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Status: ORr
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Status: ROr
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On Sun, 2002-06-23 at 23:40, Curt Sampson wrote:
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> On 23 Jun 2002, J. R. Nield wrote:
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@ -2062,7 +1984,7 @@ Comments: In-reply-to "J. R. Nield" <jrnield@usol.com>
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Date: Mon, 24 Jun 2002 17:16:01 -0400
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Message-ID: <21376.1024953361@sss.pgh.pa.us>
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From: Tom Lane <tgl@sss.pgh.pa.us>
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Status: OR
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Status: RO
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"J. R. Nield" <jrnield@usol.com> writes:
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> Also, postgreSQL can't recover from any other type of block corruption,
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@ -2129,7 +2051,7 @@ Sender: pgsql-hackers-owner@postgresql.org
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X-Spam-Status: No, hits=-3.4 required=5.0
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tests=IN_REP_TO
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version=2.30
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Status: OR
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Status: RO
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J. R. Nield wrote:
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> > This I don't quite understand. Assuming you're using a SCSI drive
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@ -2251,7 +2173,7 @@ Comments: In-reply-to Bruce Momjian <pgman@candle.pha.pa.us>
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Date: Mon, 24 Jun 2002 17:31:56 -0400
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Message-ID: <21482.1024954316@sss.pgh.pa.us>
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From: Tom Lane <tgl@sss.pgh.pa.us>
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Status: ORr
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Status: ROr
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Bruce Momjian <pgman@candle.pha.pa.us> writes:
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>> Does anyone know what the major barriers to infinite log replay are in
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@ -2277,77 +2199,6 @@ replaying the WAL log will fix 'em.
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regards, tom lane
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From pgsql-hackers-owner+M24131@postgresql.org Mon Jun 24 21:15:06 2002
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Return-path: <pgsql-hackers-owner+M24131@postgresql.org>
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Received: from postgresql.org (postgresql.org [64.49.215.8])
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Mon, 24 Jun 2002 17:31:56 -0400 (EDT)
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To: Bruce Momjian <pgman@candle.pha.pa.us>
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cc: "J. R. Nield" <jrnield@usol.com>, Curt Sampson <cjs@cynic.net>,
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PostgreSQL Hacker <pgsql-hackers@postgresql.org>
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Subject: Re: [HACKERS] Index Scans become Seq Scans after VACUUM ANALYSE
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In-Reply-To: <200206242125.g5OLPFG26140@candle.pha.pa.us>
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References: <200206242125.g5OLPFG26140@candle.pha.pa.us>
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Comments: In-reply-to Bruce Momjian <pgman@candle.pha.pa.us>
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message dated "Mon, 24 Jun 2002 17:25:14 -0400"
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Date: Mon, 24 Jun 2002 17:31:56 -0400
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Message-ID: <21482.1024954316@sss.pgh.pa.us>
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From: Tom Lane <tgl@sss.pgh.pa.us>
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Precedence: bulk
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Sender: pgsql-hackers-owner@postgresql.org
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X-Spam-Status: No, hits=-5.3 required=5.0
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tests=IN_REP_TO,X_NOT_PRESENT
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version=2.30
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Status: OR
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Bruce Momjian <pgman@candle.pha.pa.us> writes:
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>> Does anyone know what the major barriers to infinite log replay are in
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>> PostgreSQL? I'm trying to look for everything that might need to be
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>> changed outside xlog.c, but surely this has come up before. Searching
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>> the archives hasn't revealed much.
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> This has been brought up. Could we just save WAL files and get replay?
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> I believe some things have to be added to WAL to allow this, but it
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> seems possible.
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The Red Hat group has been looking at this somewhat; so far there seem
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to be some minor tweaks that would be needed, but no showstoppers.
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> Somehow you would need a tar-type
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> backup of the database, and with a running db, it is hard to get a valid
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> snapshot of that.
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But you don't *need* a "valid snapshot", only a correct copy of
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every block older than the first checkpoint in your WAL log series.
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Any inconsistencies in your tar dump will look like repairable damage;
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replaying the WAL log will fix 'em.
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regards, tom lane
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---------------------------(end of broadcast)---------------------------
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TIP 1: subscribe and unsubscribe commands go to majordomo@postgresql.org
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From pgsql-hackers-owner+M24133@postgresql.org Mon Jun 24 22:19:55 2002
|
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Return-path: <pgsql-hackers-owner+M24133@postgresql.org>
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||||
Received: from postgresql.org (postgresql.org [64.49.215.8])
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@ -2387,7 +2238,7 @@ Sender: pgsql-hackers-owner@postgresql.org
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X-Spam-Status: No, hits=-3.4 required=5.0
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tests=IN_REP_TO
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version=2.30
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Status: OR
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Status: RO
|
||||
|
||||
Tom Lane wrote:
|
||||
> Bruce Momjian <pgman@candle.pha.pa.us> writes:
|
||||
@ -2433,72 +2284,6 @@ TIP 1: subscribe and unsubscribe commands go to majordomo@postgresql.org
|
||||
|
||||
|
||||
|
||||
From pgsql-hackers-owner+M24139@postgresql.org Tue Jun 25 00:00:22 2002
|
||||
Return-path: <pgsql-hackers-owner+M24139@postgresql.org>
|
||||
Received: from postgresql.org (postgresql.org [64.49.215.8])
|
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|
||||
for <pgman@candle.pha.pa.us>; Tue, 25 Jun 2002 00:00:21 -0400 (EDT)
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Received: from localhost.localdomain (postgresql.org [64.49.215.8])
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|
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for <pgsql-hackers@postgresql.org>; Mon, 24 Jun 2002 22:08:31 -0400 (EDT)
|
||||
Mailbox-Line: From jrnield@usol.com Mon Jun 24 22:08:31 2002
|
||||
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for <pgsql-hackers@postgresql.org>; Mon, 24 Jun 2002 20:27:46 -0400 (EDT)
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by hades.usol.com (8.11.6/8.11.6) with ESMTP id g5P0RbV01261;
|
||||
Mon, 24 Jun 2002 20:27:37 -0400
|
||||
Subject: Re: [HACKERS] Index Scans become Seq Scans after VACUUM ANALYSE
|
||||
From: "J. R. Nield" <jrnield@usol.com>
|
||||
To: Tom Lane <tgl@sss.pgh.pa.us>
|
||||
cc: Curt Sampson <cjs@cynic.net>, Bruce Momjian <pgman@candle.pha.pa.us>,
|
||||
PostgreSQL Hacker <pgsql-hackers@postgresql.org>
|
||||
In-Reply-To: <21376.1024953361@sss.pgh.pa.us>
|
||||
References: <Pine.NEB.4.43.0206241150500.7326-100000@angelic.cynic.net>
|
||||
<1024951786.1793.865.camel@localhost.localdomain>
|
||||
<21376.1024953361@sss.pgh.pa.us>
|
||||
Content-Type: text/plain
|
||||
Content-Transfer-Encoding: 7bit
|
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X-Mailer: Ximian Evolution 1.0.3 (1.0.3-6)
|
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Date: 24 Jun 2002 20:28:00 -0400
|
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Message-ID: <1024964884.3031.876.camel@localhost.localdomain>
|
||||
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|
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|
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|
||||
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|
||||
tests=IN_REP_TO
|
||||
version=2.30
|
||||
Status: OR
|
||||
|
||||
On Mon, 2002-06-24 at 17:16, Tom Lane wrote:
|
||||
|
||||
> I think you have been missing the point...
|
||||
Yes, this appears to be the case. Thanks especially to Curt for clearing
|
||||
things up for me.
|
||||
|
||||
--
|
||||
J. R. Nield
|
||||
jrnield@usol.com
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
---------------------------(end of broadcast)---------------------------
|
||||
TIP 5: Have you checked our extensive FAQ?
|
||||
|
||||
http://www.postgresql.org/users-lounge/docs/faq.html
|
||||
|
||||
|
||||
|
||||
From jrnield@usol.com Mon Jun 24 20:27:45 2002
|
||||
Return-path: <jrnield@usol.com>
|
||||
Received: from hades.usol.com (IDENT:root@hades.usol.com [208.232.58.41])
|
||||
@ -2522,7 +2307,7 @@ X-Mailer: Ximian Evolution 1.0.3 (1.0.3-6)
|
||||
Date: 24 Jun 2002 20:28:00 -0400
|
||||
Message-ID: <1024964884.3031.876.camel@localhost.localdomain>
|
||||
MIME-Version: 1.0
|
||||
Status: OR
|
||||
Status: RO
|
||||
|
||||
On Mon, 2002-06-24 at 17:16, Tom Lane wrote:
|
||||
|
||||
@ -2555,7 +2340,7 @@ In-Reply-To: <1024951786.1793.865.camel@localhost.localdomain>
|
||||
Message-ID: <Pine.NEB.4.43.0206251229010.17448-100000@angelic.cynic.net>
|
||||
MIME-Version: 1.0
|
||||
Content-Type: TEXT/PLAIN; charset=US-ASCII
|
||||
Status: OR
|
||||
Status: RO
|
||||
|
||||
On 24 Jun 2002, J. R. Nield wrote:
|
||||
|
||||
@ -2599,7 +2384,7 @@ In-Reply-To: <21376.1024953361@sss.pgh.pa.us>
|
||||
Message-ID: <Pine.NEB.4.43.0206251406390.17448-100000@angelic.cynic.net>
|
||||
MIME-Version: 1.0
|
||||
Content-Type: TEXT/PLAIN; charset=US-ASCII
|
||||
Status: ORr
|
||||
Status: ROr
|
||||
|
||||
On Mon, 24 Jun 2002, Tom Lane wrote:
|
||||
|
||||
@ -2662,7 +2447,7 @@ Sender: pgsql-hackers-owner@postgresql.org
|
||||
X-Spam-Status: No, hits=-3.4 required=5.0
|
||||
tests=IN_REP_TO
|
||||
version=2.30
|
||||
Status: OR
|
||||
Status: RO
|
||||
|
||||
Curt Sampson wrote:
|
||||
> On Mon, 24 Jun 2002, Tom Lane wrote:
|
||||
@ -2735,7 +2520,7 @@ X-Virus-Scanned: by AMaViS new-20020517
|
||||
Precedence: bulk
|
||||
Sender: pgsql-hackers-owner@postgresql.org
|
||||
X-Virus-Scanned: by AMaViS new-20020517
|
||||
Status: ORr
|
||||
Status: ROr
|
||||
|
||||
I have been experimenting with empirical tests of file system and device
|
||||
level writes to determine the actual constraints in order to speed up the WAL
|
||||
@ -2953,7 +2738,7 @@ X-Mailing-List: pgsql-hackers
|
||||
Precedence: bulk
|
||||
Sender: pgsql-hackers-owner@postgresql.org
|
||||
X-Virus-Scanned: by amavisd-new at hub.org
|
||||
Status: OR
|
||||
Status: RO
|
||||
|
||||
|
||||
> One of the things I was thinking about was whether we could use up those
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user