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Oracle Tips 

by Burleson Consulting

The Data Warehouse Development Life Cycle

Oracle Data Warehouse Design

Massive De-normalization: STAR Schema Design

CREATE TABLE TEMP AS
SELECT (QUANTITY.quantity_sold * ITEM.list_price) line_total
FROM QUANTITY, ITEM
SEE CODE DEPOT FOR FULL SCRIPT
 
SELECT sum(line_total) FROM TEMP;

Also, note that the STATE-CITY table hierarchyas shown in Figure 4.3 is very deliberate. In order to be truly in third normal form, we do not allow any redundant information (except, of course, foreign keys). Given that this example has been fully normalized into five tables, a query that would appear very simple to the end user would have relatively complex SQL. For example, the SQL to calculate the sum of all orders in the Western region might look very complex, involving a five-way table join as follows:

CREATE TABLE TEMP AS
SELECT (QUANTITY.quantity_sold * ITEM.list_price) line_total
FROM QUANTITY, ITEM, CUSTOMER, CITY, STATE
SEE CODE DEPOT FOR FULL SCRIPT
STATE.region_name = 'WEST';

In the real world, of course, we would introduce enough redundancy to eliminate the CITY, and STATE tables. But, the point is clear: A manager who wants to analyze a series of complete order totals would need to do a huge amount of realtime computation. Here, we arrive at the basic tradeoff: If we want true freedom from redundant data, we must pay the price at query time.


This is an excerpt from "High Performance Data Warehousing". To learn more about Oracle, try "Oracle Tuning: The Definitive Reference", by Donald K. Burleson.  You can buy it direct from the publisher at 30% off here:
http://www.rampant-books.com/book_1002_oracle_tuning_definitive_reference_2nd_ed.htm
 

 


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