From oracle-l-bounce@freelists.org Fri May 20 17:38:54 2005 Return-Path: Received: from air891.startdedicated.com (root@localhost) by orafaq.com (8.12.10/8.12.10) with ESMTP id j4KMcssv016499 for ; Fri, 20 May 2005 17:38:54 -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 j4KMcs4Z016494 for ; Fri, 20 May 2005 17:38:54 -0500 Received: from localhost (localhost [127.0.0.1]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id 0DCD01958B0; Fri, 20 May 2005 16:36:02 -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 30871-02; Fri, 20 May 2005 16:36:01 -0500 (EST) Received: from turing (localhost [127.0.0.1]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id 8635C19386D; Fri, 20 May 2005 16:36:01 -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:content-transfer-encoding:content-disposition:references; b=IYf5lsuZFhmB7vOjGh1R6SPztOpZapNXyqqCpwfPI6MBNExskwp8nMkcXQzqNxNw5KDy6cF4axEZSBy/97z4WWwjLcMHJUUzOorgz5yDgnASB7g3gu4ty+oLFgIyqzBHHLTeuHPsDPsguYxe169CK6WJcKGhB6Zsc/EsjiVgo5s= Message-ID: Date: Fri, 20 May 2005 17:34:13 -0400 From: Paul Baumgartel To: Martic Zoran Subject: Re: sequential read on full-table scan? Cc: oracle-l@freelists.org In-Reply-To: <20050520190012.33766.qmail@web52605.mail.yahoo.com> Mime-Version: 1.0 Content-type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit Content-Disposition: inline References: <20050520190012.33766.qmail@web52605.mail.yahoo.com> X-archive-position: 20055 X-ecartis-version: Ecartis v1.0.0 Sender: oracle-l-bounce@freelists.org Errors-To: oracle-l-bounce@freelists.org X-original-sender: paul.baumgartel@gmail.com Precedence: normal Reply-To: paul.baumgartel@gmail.com X-list: oracle-l X-Virus-Scanned: by amavisd-new-20030616-p9 (Debian) at avenirtech.net X-Spam-Level: X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on air891.startdedicated.com X-Spam-Status: No, hits=0.0 required=5.0 tests=AWL autolearn=ham version=2.63 Zoran, I took your advice and found some interesting information. Here's a typical snippet of the trace file: WAIT #64: nam=3D'db file scattered read' ela=3D 1150 p1=3D17 p2=3D9813 p3= =3D3 WAIT #64: nam=3D'db file scattered read' ela=3D 959 p1=3D17 p2=3D9817 p3=3D= 2 WAIT #64: nam=3D'db file sequential read' ela=3D 2040 p1=3D17 p2=3D9820 p3= =3D1 WAIT #64: nam=3D'db file sequential read' ela=3D 547 p1=3D17 p2=3D9822 p3= =3D1 Note that there ARE scattered reads going on as well as sequential, but the scattered reads are grabbing only 2 or 3 blocks at a time. DB file multiblock read count is set to 16. Paul On 5/20/05, Martic Zoran wrote: > Paul, >=20 > Wanted to say fact 3 (buffer in the cache) + sometimes > fact 2 (extent edge). >=20 > Zoran >=20 >=20 >=20 >=20 >=20 > __________________________________ > Do you Yahoo!? > Make Yahoo! your home page > http://www.yahoo.com/r/hs >=20 --=20 Paul Baumgartel paul.baumgartel@gmail.com -- http://www.freelists.org/webpage/oracle-l