Call now: 252-767-6166  
Oracle Training Oracle Support Development Oracle Apps

 E-mail Us
 Oracle Articles
New Oracle Articles

 Oracle Training
 Oracle Tips

 Oracle Forum
 Class Catalog

 Remote DBA
 Oracle Tuning
 Emergency 911
 RAC Support
 Apps Support
 Oracle Support

 SQL Tuning

 Oracle UNIX
 Oracle Linux
 Remote s
 Remote plans
 Application Server

 Oracle Forms
 Oracle Portal
 App Upgrades
 SQL Server
 Oracle Concepts
 Software Support

 Remote S


 Consulting Staff
 Consulting Prices
 Help Wanted!


 Oracle Posters
 Oracle Books

 Oracle Scripts

Don Burleson Blog 







CODASYL IDMS Data Warehouse Redundancy  

Oracle Tips by Burleson Consulting

High Performance Data Warehousing

The CODASYL Generation Of Database Management  

Structural changes are a nightmare with network databases. Because the data relationships are hard linked with embedded pointers, the addition of an index or a new relationship requires special utility programs to "sweep" each and every affected record in the database. As each record is located, the prefix is restructured to accommodate the new pointers. Object-oriented databases encounter this same problem when a class hierarchy requires modification.

CODASYL databases were still far superior to any other technology of the day, and thousands of corporations began to implement their mission-critical systems on IDMS platforms. Even the Air Force used the IDMS database at the North American Air Defense Command (NORAD) to track incoming Soviet missiles (and, of course, Santa Claus at Christmas time). However, as soon as relational databases became fast and stable enough to support mission-critical systems, the cumbersome and inflexible CODASYL systems were abandoned.

Today, we see that the new object-oriented databases are remarkably similar to the CODASYL model. However, a data warehouse relies on the introduction of data redundancy to achieve its speed, and the pointer-based architecture of the network databases makes them less flexible than relational databases for warehouses.

Overall, we see that the CODASYL model is a database architecture that has been optimized for online record retrieval, and itís not designed for data warehouse applications. While CODASYL records can be denormalized, the record location modes of CALC and VIA, do not allow for contiguous storage of records. Consequently, we see that data warehouse applications are not very well suited to this database architecture.

This is an excerpt from "High Performance Data Warehousing", copyright 1997.
If you like Oracle tuning, you may enjoy the book Oracle Tuning: The Definitive Reference , with over 900 pages of BC's favorite tuning tips & scripts. 

You can buy it directly from the publisher and save 30%, and get instant access to the code depot of Oracle tuning scripts.


Oracle Training at Sea
oracle dba poster

Follow us on Twitter 
Oracle performance tuning software 
Oracle Linux poster


Burleson is the American Team

Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

Verify experience! Anyone considering using the services of an Oracle support expert should independently investigate their credentials and experience, and not rely on advertisements and self-proclaimed expertise. All legitimate Oracle experts publish their Oracle qualifications.

Errata?  Oracle technology is changing and we strive to update our BC Oracle support information.  If you find an error or have a suggestion for improving our content, we would appreciate your feedback.  Just  e-mail:  

and include the URL for the page.


Burleson Consulting

The Oracle of Database Support

Oracle Performance Tuning

Remote DBA Services


Copyright © 1996 -  2020

All rights reserved by Burleson

Oracle ® is the registered trademark of Oracle Corporation.