Usage-Driven Database Design by George Tillmann

Author:George Tillmann
Language: eng
Format: epub
Publisher: Apress, Berkeley, CA

Summary

Many a well-designed system is brought to its knees during maintenance. The reasons are many but particularly problematic is poor documentation. Correctly and efficiently modifying an application is difficult if the maintenance staff does not have an accurate picture of what the application does and how, exactly, it does it.

Equally important is not traveling over ground that had been trod before. It does not make sense to redesign a car simply because it needs new tires. Likewise, adding an index to a table or moving data from one file to another should not require going back to the business users to, once again, understand how those data are used.

When complete, Usage-Driven Database Design: Physical Schema Definition transforms a logical data model, based on the definition of the data from the enterprise, into a database design tuned to how the organization will use the application (Figure 9-10).

Figure 9-10.Logical data model to physical database design

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