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DB2 9 for Developers by Philip K. Gunning

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Chapter 7. Logical and Physical Design

In this chapter, we examine the concepts and tasks involved in designing a database. The process begins with the development of a logical design, which is documented in a logical model. The logical model in turn serves as the primary input to the physical database design.

Logical design is the most important step in designing a database. If you don’t do it in the beginning (and do it right), the implementation will likely fail, requiring serious changes to the application and database structure in production. Such changes usually are made at the expense of business lost when the new system doesn’t work or provides only limited functionality or performance. I’ve never worked on a project that skipped the logical ...

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