Received: from maia.hub.org (maia-3.hub.org [200.46.204.243]) by mail.postgresql.org (Postfix) with ESMTP id C00E21336FA7 for ; Thu, 17 Feb 2011 01:18:42 -0400 (AST) Received: from mail.postgresql.org ([200.46.204.86]) by maia.hub.org (mx1.hub.org [200.46.204.243]) (amavisd-maia, port 10024) with ESMTP id 33918-01 for ; Thu, 17 Feb 2011 05:18:35 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from tamriel.snowman.net (tamriel.snowman.net [72.66.115.51]) by mail.postgresql.org (Postfix) with ESMTP id 7785E133616B for ; Thu, 17 Feb 2011 01:18:35 -0400 (AST) Received: by tamriel.snowman.net (Postfix, from userid 1000) id 2101F22985; Thu, 17 Feb 2011 00:18:35 -0500 (EST) Date: Thu, 17 Feb 2011 00:18:35 -0500 From: Stephen Frost To: Jeremy Palmer Cc: "pgsql-performance@postgresql.org" Subject: Re: Does exclusive locking improve performance? Message-ID: <20110217051835.GU4116@tamriel.snowman.net> References: <666FB8D75E95AE42965A0E76A5E5337E06D966C6FD@prdlsmmsg01.ad.linz.govt.nz> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="VgRl/Nv5FvdxgY5x" Content-Disposition: inline In-Reply-To: <666FB8D75E95AE42965A0E76A5E5337E06D966C6FD@prdlsmmsg01.ad.linz.govt.nz> X-Editor: Vim http://www.vim.org/ X-Info: http://www.snowman.net X-Operating-System: Linux/2.6.32-5-amd64 (x86_64) X-Uptime: 00:17:27 up 14 days, 13:47, 24 users, load average: 0.00, 0.02, 0.00 User-Agent: Mutt/1.5.20 (2009-06-14) X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=-1.91 tagged_above=-10 required=5 tests=BAYES_00=-1.9, T_RP_MATCHES_RCVD=-0.01 X-Spam-Level: X-Archive-Number: 201102/423 X-Sequence-Number: 42561 --VgRl/Nv5FvdxgY5x Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable * Jeremy Palmer (JPalmer@linz.govt.nz) wrote: > In normal circumstances does locking a table in access exclusive mode imp= rove insert, update and delete operation performance on that table. >=20 > Is MVCC disabled or somehow has less work to do? MVCC certainly isn't disabled. Does it have less work to do? That's a bit harder to say but my guess is "not so much that you'd actually be able to notice it.".. Thanks, Stephen --VgRl/Nv5FvdxgY5x Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) iEYEARECAAYFAk1cr6sACgkQrzgMPqB3kihWqQCglaOJrAk5a/pkEJv6j/NfoIEr zbwAoIwj1xmAeOOX33896raCbTGA3DEL =1umY -----END PGP SIGNATURE----- --VgRl/Nv5FvdxgY5x--