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Data Warehouse. Massive Join. HELP!

From: <stuco_at_mailcity.com>
Date: Wed, 24 Feb 1999 20:19:38 GMT
Message-ID: <7b1msj$7gl$1@nnrp1.dejanews.com>


Here's my situation:

Data Warehouse - building a summary table based on a 7-table join (driving table is 2 million rows, other tables are about 500,000 rows each).

To load this table takes 5 hours with a nice Rule-based query that has been tuned to use unique and range index scans. Thing is...IT TAKES 5 BLOODY HOURS!! So I analyzed all the tables and indexes, ran it through the Explain Plan and all my lovely index scans in the Cost-based mode have turned into full table scans with sort-merge joins.

So I think, 'well maybe this might be faster'. ---Nope.

This is the first of many tables that are being built from our data store and with the data is taking half a day to generate. We have an IBM SP/2 running AIX 4.2 with 8 processors and 2Gig of memory.

What can I do to tune this thing??

Thanks for your help.

Stuart Cowen
Paladin Consulting - Dallas

-----------== Posted via Deja News, The Discussion Network ==---------- http://www.dejanews.com/ Search, Read, Discuss, or Start Your Own Received on Wed Feb 24 1999 - 14:19:38 CST

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