Database Systems: Design, Implementation, and Management, 10th Ed. by Carlos Coronel

Database Systems: Design, Implementation, and Management, 10th Ed. by Carlos Coronel

Author:Carlos Coronel
Language: eng
Format: mobi, epub
Tags: Computers
Publisher: Cengage Learning
Published: 2011-12-19T05:00:00+00:00


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SOURCE: Course Technology/Cengage Learning

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The performance of an information system depends on three factors:

• Database design and implementation

• Application design and implementation

• Administrative procedures

This book emphasizes the database design and implementation segment of the triad—arguably the most important of the three. However, failure to address the other two segments will likely yield a poorly functioning information system. Creating a sound information system is hard work: systems analysis and development require extensive planning to ensure that all of the activities will interface with each other, that they will complement each other, and that they will be completed on time.

In a broad sense, the term database development describes the process of database design and implementation. The primary objective in database design is to create complete, normalized, nonredundant (to the greatest extent possible), and fully integrated conceptual, logical, and physical database models. The implementation phase includes creating the database storage structure, loading data into the database, and providing for data management.

To make the procedures discussed in this chapter broadly applicable, the chapter focuses on the elements that are common to all information systems. Most of the processes and procedures described in this chapter do not depend on the size, type, or complexity of the database being implemented. However, the procedures that would be used to design a small database, such as one for a neighborhood shoe store, do not precisely scale up to the procedures that would be needed to design a database for a large corporation or even a segment of such a corporation. To use an analogy, building a small house requires a blueprint, just as building the Golden Gate Bridge did, but the bridge required far more complex planning, analysis, and design.

The next sections will trace the overall Systems Development Life Cycle and the related Database Life Cycle. Once you are familiar with those processes and procedures, you will learn about various approaches to database design, such as top-down vs. bottom-up and centralized vs. decentralized design.



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