Download Building the Data Warehouse by W. H. Inmon PDF

By W. H. Inmon

Up-to-date and extended to mirror the numerous technological advances happening because the earlier version, this most modern version of the information warehousing "bible" presents a accomplished advent to development info marts, operational information shops, the company details manufacturing facility, exploration warehouses, and Web-enabled warehouses. Written by means of the daddy of the knowledge warehouse suggestion, the publication additionally experiences the original necessities for helping e-business and explores a number of ways that the conventional information warehouse might be built-in with new applied sciences to supply superior customer support, revenues, and support-both on-line and offline-including near-line facts garage ideas.

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Extra resources for Building the Data Warehouse

Sample text

The very nature of information processing is constant change. Business conditions change, the organization changes, management changes, accounting practices change, and so on. Each of these changes has an effect on summary and informational processing. When informational processing is included in the production, legacy environment, maintenance seems to be eternal. But much of what is called maintenance in the production environment is actually informational processing going through the normal cycle of changes.

8. There is nothing to say that a physical table must reside on disk, even if it relates to other data that does reside on a disk. 8 shows that some of the related subject area data resides on direct access storage device (DASD) and some resides on magnetic tape. One implication of data residing on different media is that there may be more than one DBMS managing the data in a warehouse or that some data may not be managed by a DBMS at all. Just because data resides on magnetic tape or some storage media other than disk storage does not mean that the data is not a part of the data warehouse.

Extract/transform/load (ETL) software can automate much of this tedious process. In addition, this process of integration has to be done only once. But, in any case, it is mandatory that data flowing into the data warehouse be integrated, not merely tossed—whole cloth—into the data warehouse from the operational environment. Who Is the User? Much about the data warehouse is fundamentally different from the operational environment. When developers and designers who have spent their entire careers in the operational environment first encounter the data warehouse, they often feel ill at ease.

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