From oracle-l-bounce@freelists.org Mon Oct 3 14:52:15 2005 Return-Path: Received: from air891.startdedicated.com (root@localhost) by orafaq.com (8.12.10/8.12.10) with ESMTP id j93JqFah011986 for ; Mon, 3 Oct 2005 14:52:15 -0500 X-ClientAddr: 206.53.239.180 Received: from turing.freelists.org (freelists-180.iquest.net [206.53.239.180]) by air891.startdedicated.com (8.12.10/8.12.10) with ESMTP id j93Jq2vX011957 for ; Mon, 3 Oct 2005 14:52:09 -0500 Received: from localhost (localhost [127.0.0.1]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id DDFF31EF1AE; Mon, 3 Oct 2005 14:51:17 -0500 (EST) Received: from turing.freelists.org ([127.0.0.1]) by localhost (turing [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 26353-07; Mon, 3 Oct 2005 14:51:17 -0500 (EST) Received: from turing (localhost [127.0.0.1]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id 5B5841F0424; Mon, 3 Oct 2005 14:51:17 -0500 (EST) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:reply-to:to:subject:cc:in-reply-to:mime-version:content-type:references; b=ePkBvdPibXxdWQjMUOdkfH6vs81h0z9g58WMM4pxRfDO8a7aqJC9YTWl/Uhn8oYTAm2s8vDsQLNu2UF4J2ykEw8tgswj2ta03QdNURPvz7Fg0XRWo/AKUG3WsxfzvKplZ23rpvRaf47RbtPU1EUqXq0psV/BOT3K3K6BQQ4wIy4= Message-ID: <7765c8970510031249q4528eb6cx439f706ed3e8ac76@mail.gmail.com> Date: Mon, 3 Oct 2005 20:49:20 +0100 From: Niall Litchfield To: chiragdba@gmail.com Subject: Re: Wanna implement RAC. Cc: "Gogala, Mladen" , Oracle-L Freelists In-Reply-To: <1a3629600510030900i86a5d2brbfcc9273bb2169c@mail.gmail.com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_5389_8208999.1128368960152" References: <1a3629600510030900i86a5d2brbfcc9273bb2169c@mail.gmail.com> X-archive-position: 26257 X-ecartis-version: Ecartis v1.0.0 Sender: oracle-l-bounce@freelists.org Errors-To: oracle-l-bounce@freelists.org X-original-sender: niall.litchfield@gmail.com Precedence: normal Reply-To: niall.litchfield@gmail.com X-list: oracle-l X-Virus-Scanned: by amavisd-new-20030616-p9 (Debian) at avenirtech.net X-mailscan-MailScanner-Information: Please contact the ISP for more information X-mailscan-MailScanner: Found to be clean X-MailScanner-From: oracle-l-bounce@freelists.org X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on air891.startdedicated.com X-Spam-Level: X-Spam-Status: No, hits=-3.2 required=5.0 tests=AWL,BAYES_00,HTML_MESSAGE autolearn=ham version=2.63 ------=_Part_5389_8208999.1128368960152 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline On 10/3/05, Chirag DBA wrote: > > Thanx a lot Dear Santa. Get ready for CHRISTMAS too. ;) > As you said, let me go through this site and all the manuals. > But I have one question in mind. > HOW RAC HELPS FOR HIGHER AVAILABILITY? > It doesn't really - its a scalability solution (and arguably the wrong one)= . You might well get higher availability - in my experience this is true - fo= r the end users, but you also get higher artificial demands on the DBA and sy= s admins. By and large RAC helps you past the capacity limits of your current hardwar= e by buying more, but cheaper, hardware and adding complexity. This is not a high availability message. What RAC is is well documented in the manuals to which Mladen referred you. -- Niall Litchfield Oracle DBA http://www.niall.litchfield.dial.pipex.com ------=_Part_5389_8208999.1128368960152 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline On 10/3/05, Chirag DBA <chiragdba@gmail.com> wrote:
 
Thanx a lot Dear Santa. Get ready for CHRISTMAS too. ;)
 
As you said, let me go through this site and all the manuals.
 
But I have one question in mind.
 
HOW RAC HELPS FOR HIGHER AVAILABILITY?


It doesn't really - its a scalability solution (and arguably the wrong one). You might well get higher availability - in my experience this is true - for the end users, but you also get higher artificial demands on the DBA and sys admins.

By and large RAC helps you past the capacity limits of your current hardware by buying more, but cheaper, hardware and adding complexity. This is not a high availability message.

What RAC is is well documented in the manuals to which Mladen referred you.=

--
Niall Litchfield
Oracle DBA
http://www.niall.litchfield.dial.pipex= .com ------=_Part_5389_8208999.1128368960152-- -- http://www.freelists.org/webpage/oracle-l