From oracle-l-bounce@freelists.org Fri May 6 11:56:33 2005 Return-Path: Received: from air891.startdedicated.com (root@localhost) by orafaq.com (8.12.10/8.12.10) with ESMTP id j46GuXAF031408 for ; Fri, 6 May 2005 11:56:33 -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 j46GuX4Z031403 for ; Fri, 6 May 2005 11:56:33 -0500 Received: from localhost (localhost [127.0.0.1]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id 2C678191084; Fri, 6 May 2005 10:53:56 -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 15087-02; Fri, 6 May 2005 10:53:56 -0500 (EST) Received: from turing (localhost [127.0.0.1]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id 9F00B19069C; Fri, 6 May 2005 10:53:55 -0500 (EST) Message-ID: <427B92A5.2080104@centrexcc.com> Date: Fri, 06 May 2005 09:52:05 -0600 From: Wolfgang Breitling Organization: Centrex Consulting Corporation User-Agent: Mozilla Thunderbird 0.7.2 (Windows/20040707) X-Accept-Language: en-us, en MIME-Version: 1.0 To: "Ignizio, Richard" Cc: oracle-l@freelists.org Subject: Re: 9.2.0.6 Optimizer issue References: In-Reply-To: Content-type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit X-UCIT-MailScanner-Information: Please contact IT Help Desk at (403) 220-5555 for more information X-UCIT-MailScanner: Found to be clean X-UCIT-MailScanner-From: breitliw@centrexcc.com X-archive-position: 19405 X-ecartis-version: Ecartis v1.0.0 Sender: oracle-l-bounce@freelists.org Errors-To: oracle-l-bounce@freelists.org X-original-sender: breitliw@centrexcc.com Precedence: normal Reply-To: breitliw@centrexcc.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 responses inline Ignizio, Richard wrote: > As of right now I do not back up old statistics, but I might make it a practice now. DO, not might > The database was shutdown before the application upgrade for backups, would that erase the contents of the sys.col_usage$ table? Not normally > Would histograms affect whether Oracle chose to do a NL or a HJ? Histograms can affect not only the choice of join method but other plan particulars as well. So can any number of statistics. -- Regards Wolfgang Breitling Centrex Consulting Corporation www.centrexcc.com -- http://www.freelists.org/webpage/oracle-l