From R.Daemen@facent.nl Thu, 23 Aug 2001 04:01:11 -0700 From: "Daemen, Remco" Date: Thu, 23 Aug 2001 04:01:11 -0700 Subject: Nested loop very slow Message-ID: MIME-Version: 1.0 Content-Type: text/plain Hi, I'm joining a table with 32000 rows with a very large table (3 Gb), resulting in 97000 records. When I execute the query without hints, it uses a full table scan and a hash join, and returns a result in 4 minutes. When I use a hint forcing a nested loop (and part of an index (range scan)), the query takes 14 minutes to complete. The question is: why does a join between an inner table with 32000 records and a large table using a range scan on an index take so long ? I would expect Oracle to give a result within seconds, a few minutes tops ! The table has very few chained rows and I've rebuilt the index recently. RDBMS is 8.1.6. Index and data are divided over many different disks. Any suggestions ? Except kicking the server ? Remco -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Daemen, Remco INET: R.Daemen@facent.nl Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- 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).