From oracle-l-bounce@freelists.org Mon Mar 7 15:23:42 2005 Return-Path: Received: from air891.startdedicated.com (root@localhost) by orafaq.com (8.12.10/8.12.10) with ESMTP id j27LNgTW002927 for ; Mon, 7 Mar 2005 15:23:42 -0600 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 j27LNgem002922 for ; Mon, 7 Mar 2005 15:23:42 -0600 Received: from localhost (localhost [127.0.0.1]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id 1B50C7F2B2; Mon, 7 Mar 2005 15:22:11 -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 32124-05; Mon, 7 Mar 2005 15:22:11 -0500 (EST) Received: from turing (localhost [127.0.0.1]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id 8F1BA7F2A1; Mon, 7 Mar 2005 15:22:10 -0500 (EST) Message-ID: <016101c52353$1be57f10$6702a8c0@Primary> From: "Jonathan Lewis" To: "Oracle-L (E-mail)" References: <422C9FC3.1020605@allegientsystems.com> <10644b9e05030711462dc5600a@mail.gmail.com> <422CB464.7070906@allegientsystems.com> Subject: Re: question regarding statistics Date: Mon, 7 Mar 2005 20:20:30 -0000 MIME-Version: 1.0 Content-type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-archive-position: 17042 X-ecartis-version: Ecartis v1.0.0 Sender: oracle-l-bounce@freelists.org Errors-To: oracle-l-bounce@freelists.org X-original-sender: jonathan@jlcomp.demon.co.uk Precedence: normal Reply-To: jonathan@jlcomp.demon.co.uk X-list: oracle-l X-Virus-Scanned: by amavisd-new-20030616-p9 (Debian) at avenirtech.net X-Spam-Checker-Version: SpamAssassin 2.60 (1.212-2003-09-23-exp) on air891.startdedicated.com X-Spam-Status: No, hits=0.1 required=5.0 tests=AWL autolearn=ham version=2.60 X-Spam-Level: The chain_cnt isn't used, but arguably it OUGHT to be used; in much the same way that the pct_direct_access has an effect on secondary indexes on IOTs. Keep an eye open for the day that dbms_stats suddenly starts to collect it. Regards Jonathan Lewis http://www.jlcomp.demon.co.uk/faq/ind_faq.html The Co-operative Oracle Users' FAQ http://www.jlcomp.demon.co.uk/seminar.html Public Appearances - schedule updated Jan 21st 2005 ----- Original Message ----- From: "Mladen Gogala" >Also, dbms_stats doesn't gather a number of stats like: EMPTY_BLOCKS, >AVG_SPACE, CHAIN_CNT. > Those are not used by the optimizer. DBMS_STATS also doesn't give you the time of day, the age of Joan Rivers or birthplace of Bill O'Reilly. CHAIN_CNT is only used in BDSM optimizer, which is licensed separately in the kinky database option. Not many people use that. -- http://www.freelists.org/webpage/oracle-l