From oracle-l-bounce@freelists.org Fri Apr 23 10:26:26 2004 Return-Path: Received: from air189.startdedicated.com (root@localhost) by orafaq.com (8.11.6/8.11.6) with ESMTP id i3NFQ5005348 for ; Fri, 23 Apr 2004 10:26:21 -0500 X-ClientAddr: 206.53.239.180 Received: from turing.freelists.org (freelists-180.iquest.net [206.53.239.180]) by air189.startdedicated.com (8.11.6/8.11.6) with ESMTP id i3NFPt605298 for ; Fri, 23 Apr 2004 10:26:05 -0500 Received: from localhost (localhost [127.0.0.1]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id D8A8572D2AF; Fri, 23 Apr 2004 10:18:23 -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 28428-74; Fri, 23 Apr 2004 10:18:23 -0500 (EST) Received: from turing (localhost [127.0.0.1]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id 054C072D084; Fri, 23 Apr 2004 10:18:23 -0500 (EST) Received: with ECARTIS (v1.0.0; list oracle-l); Fri, 23 Apr 2004 10:17:04 -0500 (EST) X-Original-To: oracle-l@freelists.org Delivered-To: oracle-l@freelists.org Received: from localhost (localhost [127.0.0.1]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id E545072CD72 for ; Fri, 23 Apr 2004 10:17:03 -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 27679-93 for ; Fri, 23 Apr 2004 10:17:03 -0500 (EST) Received: from maillnx-us111.fmr.com (maillnx-us111.fmr.com [192.223.198.26]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id 498C072CA5D for ; Fri, 23 Apr 2004 10:17:03 -0500 (EST) Received: from virmro110nts.fmr.com (VIRMRO110NTS.fmr.com [172.26.5.98]) by maillnx-us111.fmr.com (Switch-3.1.2/Switch-3.1.0) with SMTP id i3NFSv9c011090 for ; Fri, 23 Apr 2004 11:28:57 -0400 Received: from MSGBOSCLF2WIN.fmr.com ([10.46.17.175]) by MSGMROIM01WIN.DMN1.FMR.COM with Microsoft SMTPSVC(5.0.2195.6713); Fri, 23 Apr 2004 11:28:56 -0400 X-MimeOLE: Produced By Microsoft Exchange V6.0.6521.0 content-class: urn:content-classes:message Subject: RE: CPU COSTING MIME-Version: 1.0 Content-type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Date: Fri, 23 Apr 2004 11:28:56 -0400 Message-ID: <42BBD772AC30EA428B057864E203C999113F48@MSGBOSCLF2WIN.DMN1.FMR.COM> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: CPU COSTING Thread-Index: AcQpQ9C2bynrAtS7RUWG4cBdT16kWAAAnfxA From: "Khedr, Waleed" To: X-OriginalArrivalTime: 23 Apr 2004 15:28:56.0962 (UTC) FILETIME=[B1713620:01C42947] X-Virus-Scanned: by amavisd-new at freelists.org X-archive-position: 3646 X-ecartis-version: Ecartis v1.0.0 Sender: oracle-l-bounce@freelists.org Errors-To: oracle-l-bounce@freelists.org X-original-sender: Waleed.Khedr@FMR.COM Precedence: normal Reply-To: oracle-l@freelists.org X-list: oracle-l X-Virus-Scanned: by amavisd-new at freelists.org So the buffer cache has no impact on the stats.=20 Was wondering how this system stats get calculated, it has to be = collected by the individual sessions themselves and then all the = collected numbers get summarized/correlated into one set of numbers = (system level). Waleed -----Original Message----- From: Jonathan Lewis [mailto:jonathan@jlcomp.demon.co.uk] Sent: Friday, April 23, 2004 10:59 AM To: oracle-l@freelists.org Subject: Re: CPU COSTING Not quite - The new cost model allows Oracle to work out a better balance between the time taken for a single and multi-block read -- which is what people used to use o_i_c_a for. It does not (yet) allow for the fact that the buffer cache exists. Consequently you need to consider opt_ind_cache still; and review the value for o_i_c_a, view it as an indicator of the percentage of table I/Os that will turn=20 into real physical read requests. 10g has indications that it will also consider the recent history of per-segment cache benefits to modify costs and plans - but I don't think it's enabled in the current release. Regards Jonathan Lewis http://www.jlcomp.demon.co.uk The Co-operative Oracle Users' FAQ http://www.jlcomp.demon.co.uk/faq/ind_faq.html April 2004 Iceland http://www.index.is/oracleday.php=20 June 2004 UK - Optimising Oracle Seminar July 2004 USA West Coast, Optimising Oracle Seminar August 2004 Charlotte NC, Optimising Oracle Seminar September 2004 USA East Coast, Optimising Oracle Seminar September2004 UK - Optimising Oracle Seminar ----- Original Message -----=20 From: "Khedr, Waleed" To: Sent: Friday, April 23, 2004 3:25 PM Subject: RE: CPU COSTING So for reads (i/o0 it measures the logical reads that might get =3D translated to physical or not. It's affected by the buffer cache, and = =3D this makes sense. So as you said, any changes/tuning to oica and oic (opt_ind_cache) might = =3D need to be altered again. Waleed ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request@freelists.org put 'unsubscribe' in the subject line. -- Archives are at http://www.freelists.org/archives/oracle-l/ FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html ----------------------------------------------------------------- ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request@freelists.org put 'unsubscribe' in the subject line. -- Archives are at http://www.freelists.org/archives/oracle-l/ FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html -----------------------------------------------------------------