BC remote Oracle DBA - Call (800) 766-1884  
Oracle Consulting Oracle Training Development

Remote DBA

Remote DBA Plans  

Remote DBA Service

Remote DBA RAC

Remote DBA Oracle Home
Remote DBA Oracle Training
Remote DBA SQL Tuning Consulting
Remote DBA Oracle Tuning Consulting
Remote DBA Data Warehouse Consulting
Remote DBA Oracle Project Management
Remote DBA Oracle Security Assessment
Remote DBA Unix Consulting
Burleson Books
Burleson Articles
Burleson Web Courses
Burleson Qualifications
Oracle Links
Remote DBA Oracle Monitoring
Remote DBA Support Benefits
Remote DBA Plans & Prices
Our Automation Strategy
What We Monitor
Oracle Apps Support
Print Our Brochure
Contact Us (e-mail)
Oracle Job Opportunities
Oracle Consulting Prices





Remote DBA services

Remote DBA Support

Remote DBA RAC

Remote DBA Reasons

Remote Oracle Tuning

Remote DBA Links

Oracle DBA Support

Oracle DBA Forum

Oracle Disaster

Oracle Training

Oracle Tuning

Oracle Training

 Remote DBA SQL Server

Remote MSSQL Consulting

Oracle DBA Hosting

Oracle License Negotiation









Oracle Tips 

by Burleson Consulting

The Data Warehouse Development Life Cycle

Aggregating Data For The Oracle Warehouse
Using SQL To Create Summary Tables

If we keep our summary tables in the same database as our data warehouse, it becomes easy to create the summary tables. In the following example, you can see how we can easily use Oracle SQL to create our tables:

CREATE TABLE month_by_customer_name
SELECT month, customer_name, sum(total_sales)
FROM fact
GROUP BY customer_name;

CREATE TABLE region_by_item
SELECT region, item_number, sum(total_sales)
FROM fact
GROUP BY item_number;

Note: These summary calculations may invoke full-table scans against your data warehouse and may also use a very large sort area, requiring sorting to disk. Because of the intense nature of these queries, you will want to ensure that these summary tables are created during off hours. For more information about tuning the creation of summary tables, see Chapter 12, Tuning Oracle SQL.

Now that you see how easy it is to create summary tables, note that it would be very easy to parameterize the Oracle SQL to allow the dimension names to be replaced by symbolic variables. For example:

SELECT &1, &2, SUM(total_sales)

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:


Expert Remote DBA

BC is America's oldest and largest Remote DBA Oracle support provider.  Get real Remote DBA experts, call
BC Remote DBA today.



Remote DBA Service

Oracle Tuning Book


Advance SQL Tuning Book 

BC Oracle support

Oracle books by Rampant

Oracle monitoring software







BC Remote Oracle Support

Remote DBA

Remote DBA Services

Copyright © 1996 -  2013 by Burleson. All rights reserved.

Oracle® is the registered trademark of Oracle Corporation.