I second this. Last year a developer put together a scenario in one of our data warehouses involving a big base table, hierarchies, and 8 MVs as summaries of that data, with query rewrite, etc. Supporting it has taken some getting used to, but now I like it and am on the lookout to take advantage of this technology in other areas.
>>> [EMAIL PROTECTED] 03/20/03 05:54PM >>> One of the options for materialized views is to 'create MV on prebuilt table' If you want to use the table for direct queries, then you can - if you enable query rewrite then suitable queries against the base tables can be rewritten to take advantage of the MV. It's a technique I've advised clients to use when materialized views first appeared and they already had a big investment in code to create aggregate tables. Prebuilt tables are also my favourite option for MVs - you don't get the awful unpredictable that can appear with dynamic refreshes. 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: 20 March 2003 22:09 > Paula, > > I'm not sure what would an MV on top of an aggregate > give me. I mean, I have a base table and I need to > aggregate. I can see doing it via an aggregate table > or (as someone suggested) via an MV. But you are > suggesting both. What benefit do you see from that? > What am I missing? > -- 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). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Darrell Landrum 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).
