The Metalink description of this hint seems a little obscure. My experience is that it simply allows you to reference a nested table directly without 'pseudo-joining' it to its rightful parent.
Given the funny games (such as using a thoroughly spurious /*+ cardinality() */ hint, and bypassing the constraint on updateable join views) that Oracle plays for its internal purposes, I wouldn't be surprised to see them "cheating" like this on MV updates as well. It doesn't necessarily mean anything. Regards Jonathan Lewis http://www.jlcomp.demon.co.uk Now available One-day tutorials: Cost Based Optimisation Trouble-shooting and Tuning Indexing Strategies (see http://www.jlcomp.demon.co.uk/tutorial.html ) ____UK_______April 8th ____UK_______April 22nd ____Denmark May 21-23rd ____USA_(FL)_May 2nd Next dates for the 3-day seminar: (see http://www.jlcomp.demon.co.uk/seminar.html ) ____UK_(Manchester)_May ____USA_(CA, TX)_August The Co-operative Oracle Users' FAQ http://www.jlcomp.demon.co.uk/faq/ind_faq.html ----- Original Message ----- To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]> Sent: 13 March 2003 20:18 Hi, I'm currently defining an optimization strategy for a reporting environment. The reporting environment is refreshing 41 materialized views on a weekly basis. Some of the MV take over an 1 hour to refresh. During the MV refresh, in Statspack, I can see that the top SQL are Oracle generated SQL using the NESTED_TABLE_GET_REFS hint. >From metalink : "If this is a DSS system, you probably have a smaller shared pool and use import/export heavily. If so,it might be a good idea to use a bigger shared pool when doing this activity." Anyone has more info on this. TIA Stephane Paquette Administrateur de bases de donnees Database Administrator Standard Life www.standardlife.ca Tél. (514) 925-7187 [EMAIL PROTECTED] -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Jonathan Lewis INET: [EMAIL PROTECTED] 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: [EMAIL PROTECTED] (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).
