tailieunhanh - Ebook Modern database management (Twelfth edition): Part 2

Ebook Modern database management (Twelfth edition): Part 2 presents the following content: Physical Database Design and Performance; Database Application Development; Data Warehousing; Data Quality and Integration; Big Data and Analytics; . | Part III Database Design An Overview of Part Three Chapter 4 By the end of the database analysis phase of database development systems and Logical Database database analysts have a fairly clear understanding of data storage and access Design and the requirements. However the data model developed during analysis explicitly avoids Relational Model any ties to database technologies. Before we can implement a database the conceptual data model must be mapped into a data model that is compatible with Chapter 5 the database management system to be used. Physical Database The activities of database design transform the requirements for data Design and Performance storage developed during database analysis into specifications to guide database implementation. There are two forms of specifications 1. Logical specifications which map the conceptual requirements into the data model associated with a pecific database management system. s 2. Physical specifications which indicate all the parameters for data stor- age that are then used as input for database implementation. During this phase a database is actually defined using a data definition language. In Chapter 4 Logical Database Design and the Relational Model we describe logical database design with special emphasis on the relational data model. Logical database design is the process of transforming the conceptual data model described in Chapters 2 and 3 into a logical data model. Most database management systems in use today are based on the relational data model so this data model is the basis for our discussion of logical database design. In Chapter 4 we first define the important terms and concepts for this model including relation primary key and surrogate primary key foreign key anomaly normal form normalization functional dependency partial functional dependency and transitive dependency. We next describe and illustrate the process of transforming an E-R model to the relational model. Many modeling tools support .

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