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Doesn't it require a lot of data duplication to keep tons of data in a central data warehouse, then export that data to various data marts?

    Ask The Experts published in DMReview.com
July 1, 1999
 
  By Sid Adelman and David Marco

Q:

Doesn't it require a lot of data duplication to keep tons of data in a central data warehouse, then export that data to various data marts? How do you keep down storage and management costs for huge amounts of data?

A:

Sid Adelman's answer: Remember when they said that database management systems would eliminate redundant data? It never happened and never will. The data warehouse will result in a certain amount of data duplication, and a central (enterprise) data warehouse feeding data marts will result in data duplication. The best you can do is try to control unrestrained growth. See the article entitled, "The Data Warehouse Explosion" (by Sid Adelman) in the December, 1996 Issue of DM Review for ways to keep storage contained.

David Marco's answer: A data warehouse feeding dependent data marts (marts fed from a warehouse) certainly creates some data duplication, however the alternative of creating a series of independent data marts (sourced directly from operational systems) creates a much greater amount of data redundancy. This redundancy occurs because each of the independent data marts requires its own, typically duplicated copy of the detailed corporate data. Often a great deal of this detailed data is not required in the data marts, which typically provide summarized views.

...............................................................................

For more information on related topics visit the following related portals...
Data Marts, DW Administration, Mgmt., Performance and Storage.

Sid Adelman is a principal in Sid Adelman & Associates, an organization specializing in planning and implementing data warehouses, in data warehouse and BI assessments, and in establishing effective data architectures and strategies. He is a regular speaker at DW conferences. Adelman chairs the "Ask the Experts" column on www.dmreview.com. He is a frequent contributor to journals that focus on data warehousing. He co-authored Data Warehouse Project Management and is the principal author on Impossible Data Warehouse Situations with Solutions from the Experts. His new book, Data Strategy, is scheduled for publication this year. He can be reached at 818-783-9634 or sidadelman@aol.com.  Visit his Web site at www.sidadelman.com.

David Marco is an internationally recognized expert in the fields of enterprise architecture, data warehousing and business intelligence and is the world's foremost authority on meta data. He is the author of Universal Meta Data Models (Wiley, 2004) and Building and Managing the Meta Data Repository: A Full Life-Cycle Guide (Wiley, 2000). Marco has taught at the University of Chicago and DePaul University, and in 2004 he was selected to the prestigious Crain's Chicago Business "Top 40 Under 40."  He is the founder and president of Enterprise Warehousing Solutions, Inc., a GSA schedule and Chicago-headquartered strategic partner and systems integrator dedicated to providing companies and large government agencies with best-in-class business intelligence solutions using data warehousing and meta data repository technologies. He may be reached at (866) EWS-1100 or via e-mail at DMarco@EWSolutions.com.

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