Storage Retrieval

Download Database modeling & design : logical design by Toby J Teorey; Sam Lightstone; Tom Nadeau PDF

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By Toby J Teorey; Sam Lightstone; Tom Nadeau

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There are at least two uses for activity diagrams in the context of database design. Activity diagrams can specify the interactions of classes in a database schema. Class diagrams capture structure, activity diagrams capture behavior. The two types of diagrams can present complementary aspects of the same system. 12 illustrates the usage of classes named Quote, Order, Invoice, and Payment. Another use for activity diagrams in the context of database design is to illustrate processes surrounding the database.

A Rendition is associated with Musicians and Instruments. A given Musician-Instrument combination is associated with any number of Renditions. A specific Rendition-Musician combination may be associated with any number of Instruments. A given Rendition-Instrument combination is associated with any number of Musicians. A system can be understood more easily by shifting focus to each package in turn. 10. The associated classes from the Music and Distribution packages are also shown, detailing how the Media package is related to the other two packages.

The example introduced in Chapter 2 is used again to illustrate the ER modeling principles developed in this chapter. 1 Introduction Logical database design is accomplished with a variety of approaches, including the top-down, bottom-up, and combined methodologies. The traditional approach, particularly for relational databases, has been a low-level, bottom-up activity, synthesizing individual data elements into normalized tables after carefully analyzing the data element interdependencies defined during the requirements analysis.

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