Return-Path: Received: from ensim.rackshack.net (root@localhost) by orafaq.net (8.11.6/8.11.6) with ESMTP id h45JcOr21615 for ; Mon, 5 May 2003 14:38:24 -0500 X-ClientAddr: 209.68.248.164 Received: from newsfeed.cts.com (newsfeed.cts.com [209.68.248.164]) by ensim.rackshack.net (8.11.6/8.11.6) with ESMTP id h45JcOA21610 for ; Mon, 5 May 2003 14:38:24 -0500 Received: from fatcity.com (uucp@localhost) by newsfeed.cts.com (8.9.3/8.9.3) with UUCP id KAA77124; Mon, 5 May 2003 10:13:27 -0700 (PDT) Received: by fatcity.com (26-Feb-2001/v1.0g-b72/bab) via UUCP id 0058FC02; Mon, 05 May 2003 09:31:55 -0800 Message-ID: Date: Mon, 05 May 2003 09:31:55 -0800 To: Multiple recipients of list ORACLE-L X-Comment: Oracle RDBMS Community Forum X-Sender: Gurelei Sender: root@fatcity.com Reply-To: ORACLE-L@fatcity.com Errors-To: ML-ERRORS@fatcity.com From: Gurelei Subject: need help with an update Organization: Fat City Network Services, San Diego, California X-ListServer: v1.0g, build 72; ListGuru (c) 1996-2001 Bruce A. Bergman Precedence: bulk Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Hi all: May be someone can help me to tune this update ... update A1 a set a.empl_hrchy_id = (select maxid from B1 b where a.usr_id = b.usr_id) where exists (select 'x' from B1 where usr_id = a.usr_id) Table A1 has several million rows (5 to 6), table B1 has no more than 5 thousand rows.. A1 is indexed on the fields, usr_id, usr_id/empl_hrchy_id and empl_hrcy_id/usr_id. B1 has no indices. The explain plan shows a full table scan against the A1 table, which is something I'd like to avoid. Is there a way to make Oracle use an index instead (without hints)? thanks Gene __________________________________ Do you Yahoo!? The New Yahoo! Search - Faster. Easier. Bingo. http://search.yahoo.com -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Gurelei INET: gurelei@yahoo.com Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru@fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).