Received: from maia.hub.org (unknown [200.46.208.211]) by mail.postgresql.org (Postfix) with ESMTP id 12F87633266 for ; Tue, 30 Mar 2010 11:43:43 -0300 (ADT) Received: from mail.postgresql.org ([200.46.204.86]) by maia.hub.org (mx1.hub.org [200.46.208.211]) (amavisd-maia, port 10024) with ESMTP id 11267-07 for ; Tue, 30 Mar 2010 14:43:20 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mail-fx0-f225.google.com (mail-fx0-f225.google.com [209.85.220.225]) by mail.postgresql.org (Postfix) with ESMTP id A2DB06326BA for ; Tue, 30 Mar 2010 11:43:29 -0300 (ADT) Received: by fxm25 with SMTP id 25so30657fxm.3 for ; Tue, 30 Mar 2010 07:43:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:received:message-id:subject:from:to:cc:content-type; bh=rqJ0rZ3CFa2VamtXJYTdqu23GQYxkhGnPiR4bARI9S8=; b=gA0px7Aeb2iR/W2FmV56rVIfZTdw75d7dT5vLnn3MqM8/mE9y2X+Cpt7nY/uRMeiiL PxmHQvLRqN99fCIjSupC4Wf6q/jeAfXnbl980m9pYlYOayEMck4ceuG7tIwdtuykoOvW 9eRArYhtrey+YePuxBwXvJrt2nZgTPQXvevVA= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; b=pjJ5KKvXwdauYBnm37etQtDI5Pjlo10D0jw6YJv8b/QtleVvnXpS0MpXzWsy+RciwN VHrYqI2x9T7v2fa5ovExcuodx4Fzc6UlXg+Yip2tkEEGO+TXIWSqU7il2JroHMBQGwzC DNjPbvU6KTYruUZpVr3fm1rz1hlQBIpkUz13c= MIME-Version: 1.0 Received: by 10.239.161.83 with HTTP; Tue, 30 Mar 2010 07:43:27 -0700 (PDT) In-Reply-To: <645d9d71003282300j6ef4a9d5pbfa257667e6a7e3a@mail.gmail.com> References: <645d9d71003250801o246439a0j93c7b568786e98de@mail.gmail.com> <3073cc9b1003251015x590e962ata59dadbb58b42ce5@mail.gmail.com> <645d9d71003252019u6f01a513x7876c1a97b448dea@mail.gmail.com> <645d9d71003282300j6ef4a9d5pbfa257667e6a7e3a@mail.gmail.com> Date: Tue, 30 Mar 2010 10:43:27 -0400 Received: by 10.239.180.200 with SMTP id j8mr591169hbg.166.1269960207382; Tue, 30 Mar 2010 07:43:27 -0700 (PDT) Message-ID: <603c8f071003300743q4a63ebf4t514c27e067500939@mail.gmail.com> Subject: Re: Why Wal_buffer is 64KB From: Robert Haas To: Tadipathri Raghu Cc: Scott Marlowe , Pierre C , Jaime Casanova , pgsql-performance@postgresql.org Content-Type: text/plain; charset=ISO-8859-1 X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=-2.482 tagged_above=-10 required=5 tests=AWL=0.117, BAYES_00=-2.599 X-Spam-Level: X-Archive-Number: 201003/387 X-Sequence-Number: 38212 On Mon, Mar 29, 2010 at 2:00 AM, Tadipathri Raghu wrote: > I have noticed one more thing here, that if you turn off the fsync and try > to run the transaction than its breaking the currnet filenode and generating > another filenode. Is it true that whenever you turn off or on the fsync the > filenode will break and create one more on that table. I don't know what you mean by a filenode. Changing the fsync parameter doesn't cause any additional files to be created or written. ...Robert