From oracle-l-bounce@freelists.org Wed May 5 12:43:16 2004 Return-Path: Received: from air189.startdedicated.com (root@localhost) by orafaq.com (8.11.6/8.11.6) with ESMTP id i45HgpD26827 for ; Wed, 5 May 2004 12:43:01 -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 i45Hge626781 for ; Wed, 5 May 2004 12:42:50 -0500 Received: from localhost (localhost [127.0.0.1]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id 6D1CF72D43C; Wed, 5 May 2004 12:33:02 -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 06079-70; Wed, 5 May 2004 12:33:02 -0500 (EST) Received: from turing (localhost [127.0.0.1]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id B283972D757; Wed, 5 May 2004 12:33:01 -0500 (EST) Received: with ECARTIS (v1.0.0; list oracle-l); Wed, 05 May 2004 12:31:45 -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 BBABD72D258 for ; Wed, 5 May 2004 12:31:44 -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 06079-35 for ; Wed, 5 May 2004 12:31:44 -0500 (EST) Received: from smtp.wangtrading.com (smtp.wangtrading.com [167.206.68.5]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id 17B5172D395 for ; Wed, 5 May 2004 12:31:44 -0500 (EST) Received: from mladen.wangtrading.com (Not Verified[192.168.3.47]) by smtp.wangtrading.com with NetIQ MailMarshal (v5.5.5.8) id ; Wed, 05 May 2004 13:43:23 -0400 Received: from mladen (localhost.localdomain [127.0.0.1]) by mladen.wangtrading.com (8.12.8/8.12.8) with ESMTP id i45HjWFp003231 for ; Wed, 5 May 2004 13:45:32 -0400 Date: Wed, 5 May 2004 13:45:32 -0400 From: Mladen Gogala To: oracle-l@freelists.org Subject: Re: Wrong results using decode when db upgraded to 9205 Message-ID: <20040505174532.GC3154@mladen.wangtrading.com> References: <07BA8175B092D611B1DE00B0D049A31501B0B74A@exchange.ad.starkinvestments.com> <40991EBE.1C471491@sun.com> Mime-Version: 1.0 Content-type: text/plain; charset=ISO-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <40991EBE.1C471491@sun.com> (from Daniel.Fink@Sun.COM on Wed, May 05, 2004 at 13:05:02 -0400) X-Mailer: Balsa 2.0.17 Lines: 21 X-Virus-Scanned: by amavisd-new at freelists.org X-archive-position: 4479 X-ecartis-version: Ecartis v1.0.0 Sender: oracle-l-bounce@freelists.org Errors-To: oracle-l-bounce@freelists.org X-original-sender: mladen@wangtrading.com Precedence: normal Reply-To: oracle-l@freelists.org X-list: oracle-l X-Virus-Scanned: by amavisd-new at freelists.org On 05/05/2004 01:05:02 PM, Daniel Fink wrote: > Contrary to rumor, the RBO is alive and well in 10g (though > supposed to be on it's last legs). Well, it is alive, but not well. If you don't change defaults, 10g does dynamic sampling all by itself and you will always get some statistics. which means that you will always get CBO, unless you reset dynamic sampling and disable statistics collection with dbms_scheduler.disable('GATHER_STATS_JOB') DBMS_SCHEDULER is DBMS_JOB on steroids. Also, you cannot set optimizer_mode to rule in init.ora (OK, OK, it's spfile.ora), there is no /*+ RULE */ hint and oracle did everything to make the use of RBO as inconvenient as possible. Also, there is no documentation, so I don't know whether RBO will prune partitions, do hash joins or perform an index skip-search (OK, I know that RBO will not do thiat, but not from 10g documentation). Fortunately, the event 10053 still works as it is supposed to, so we can take a peek under the hood. -- Mladen Gogala Oracle DBA Note: This message is for the named person's use only. It may contain confidential, proprietary or legally privileged information. No confidentiality or privilege is waived or lost by any mistransmission. If you receive this message in error, please immediately delete it and all copies of it from your system, destroy any hard copies of it and notify the sender. You must not, directly or indirectly, use, disclose, distribute, print, or copy any part of this message if you are not the intended recipient. Wang Trading LLC and any of its subsidiaries each reserve the right to monitor all e-mail communications through its networks. Any views expressed in this message are those of the individual sender, except where the message states otherwise and the sender is authorized to state them to be the views of any such entity. ---------------------------------------------------------------- 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 -----------------------------------------------------------------