Abstract: This chapter discusses the concept of database based on relational, object-oriented, and object-relational models, which represent significant advances in database technologies. Database federation issues are also introduced. A database is a collection of structured, interrelated information units. Database systems are used at all levels of management, research, and production to provide uniform access to and control of consistent information. This chapter reviews the concepts of structures, constraints, and operations of the relational database model along with an informal presentation of the major structured query language (SQL) server. The SQL language consists of a set of primitives for defining, accessing, and managing data stored in a relational database. A federated database system is a collection of autonomous, heterogeneous, and cooperative component database systems. The goal is to share and exchange information by cooperating with other components in the federation without compromising the autonomy of each component database system. The issues related to the sharing and exchange of information among federated database systems is considered in three different phases: namely, the information discovery phase, the semantic heterogeneity resolution phase, and the system-level interconnection phase.
Publication Year: 2001
Publication Date: 2001-01-01
Language: en
Type: book-chapter
Indexed In: ['crossref']
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Cited By Count: 2
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