From oracle-l-bounce@freelists.org Mon Aug 8 14:45:41 2005 Return-Path: Received: from air891.startdedicated.com (root@localhost) by orafaq.com (8.12.10/8.12.10) with ESMTP id j78JjeJf016331 for ; Mon, 8 Aug 2005 14:45:40 -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 j78JjcIP016315 for ; Mon, 8 Aug 2005 14:45:38 -0500 Received: from localhost (localhost [127.0.0.1]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id 4F8681DD02B; Mon, 8 Aug 2005 13:54:27 -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 20475-05; Mon, 8 Aug 2005 13:54:27 -0500 (EST) Received: from turing (localhost [127.0.0.1]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id B28EE1DD4CA; Mon, 8 Aug 2005 13:54:26 -0500 (EST) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Message-ID:Received:Date:From:Subject:To:Cc:In-Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding; b=fEu1QhyQSRZlne+Ojz928Vc/i2Op1GInw2KQvYxKuvZDcFG9pf7CFb0hCQGl9soPeRzOMcXr00CRErjkSi4Fl461BYhLuIkZZDmoErG+g1isYQ3cjchXAaYjcKdBYg/3VZ+WytgtyRtx3cvU9IDfFGWkCCl1+NjQUPthXa4YU3w= ; Message-ID: <20050808185230.80697.qmail@web52811.mail.yahoo.com> Date: Mon, 8 Aug 2005 11:52:30 -0700 (PDT) From: Deepak Sharma Subject: RE: Buffer Sort explanation To: Christian.Antognini@trivadis.com Cc: oracle-l@freelists.org In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 X-archive-position: 23587 X-ecartis-version: Ecartis v1.0.0 Sender: oracle-l-bounce@freelists.org Errors-To: oracle-l-bounce@freelists.org X-original-sender: sharmakdeep_oracle@yahoo.com Precedence: normal Reply-To: sharmakdeep_oracle@yahoo.com X-list: oracle-l X-Virus-Scanned: by amavisd-new-20030616-p9 (Debian) at avenirtech.net X-mailscan-MailScanner-Information: Please contact the ISP for more information X-mailscan-MailScanner: Found to be clean X-MailScanner-From: oracle-l-bounce@freelists.org X-Spam-Level: X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on air891.startdedicated.com X-Spam-Status: No, hits=-3.9 required=5.0 tests=AWL,BAYES_00, FORGED_YAHOO_RCVD,UPPERCASE_25_50 autolearn=no version=2.63 The temp_disable did get rid of the TEMP table creation step in the star_transformation plan, but tkprof still shows a very high BUFFER SORT, and the query failed w/ 'snapshot too old' after 3 Hrs. With the temp table step, it did finish in 2 1/2 hrs or so. ===== 105 BITMAP MERGE 352207 BITMAP KEY ITERATION 128553935 BUFFER SORT 1627265 TABLE ACCESS BY GLOBAL INDEX ROWID OBJ#(1433369) PARTITION: ROW LOCATION ROW LOCATION 1627265 INDEX RANGE SCAN OBJ#(1433605) (object id 1433605) 352207 BITMAP INDEX RANGE SCAN OBJ#(3441108) PARTITION: 1 177 (object id 3441108) --- Christian Antognini wrote: > Hi > > > > > Rows Operation > > ========= > ======================================= > >a) 105 BITMAP MERGE > >b) 351549 BITMAP KEY ITERATION > >c) 127009880 BUFFER SORT > >d) 1607720 TABLE ACCESS FULL > SYS_TEMP_4254956840 > >e) 351549 BITMAP INDEX RANGE SCAN > OBJ#(3441108) > > > > I'm not able to explain you what the BUFFER SORT > exactly does in this case (it should only get the > data from the temporary table and prepare them for > the "join" with the index on the fact table... > Anyway, each time I have a problem with a star > transformation with temporary tables I try to > disable the temporary tables (they were/are buggy!). > Therefore try > star_transformation_enabled=temp_disable. > > > > > > Regards, > > Chris > > > > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com -- http://www.freelists.org/webpage/oracle-l