Message-Id: <24765.322916@fatcity.com> From: "BALA,PRAKASH (HP-USA,ex1)" Date: Mon, 24 Mar 2003 11:32:52 -0800 Subject: RE: Reorganizing tables Hi Dennis, Let me try to answer part of question#1. We only deal with warehouse applications. So there are only inserts and updates. All tablespaces are LMTs and I use 3 extent sizes (128K, 4M and 32M). I do not mix the staging (insert and truncate) tables and the normal tables in the same tablespace. Once I month, I run a job for tables in 128K and 4M tablespaces to see whether I need to promote them to a higher extent size. If so, I export, drop, recreate and import in a new tablespace. I do not use the 'alter table ... move ...' command since it retains the old extent size for the very 1st extent in the new tablespace. I have your other questions in my 'to do' list but have not got time to work on them yet. Thanks Prakash -----Original Message----- From: DENNIS WILLIAMS [mailto:DWILLIAMS@LIFETOUCH.COM] Sent: Monday, March 24, 2003 12:39 To: Multiple recipients of list ORACLE-L Subject: Reorganizing tables We have a new manager, and at his last employer the DBAs reorganize Oracle tables on a regular basis. I don't reorg tables on a regular basis. He is lobbying us to investigate this and test whether it would or wouldn't increase performance. We are on Oracle 8.1.6, Compaq Tru64, all tables are LMT with uniform extents. This is an OLTP system, but the users continue to add reports and the reports do quite a few full table scans. The reports are probably the critical performance issue at this time. - Do you do regular table reorgs? What benefit does that give you? - Are there any indicators of when a table reorg would be beneficial? - What sort of test would verify whether a table reorg changed performance? Dennis Williams DBA, 40%OCP, 100% DBA Lifetouch, Inc. dwilliams@lifetouch.com -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: DENNIS WILLIAMS INET: DWILLIAMS@LIFETOUCH.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).