2003

chapter in monograph

english

EN Database systems have evolved from simple record-oriented navigational database systems, hierarchical and network systems, into set-oriented systems that gave way to relational database systems. The relational database systems are now evolving into object-relational and multimedia database systems. During the last years, database systems have been used as platforms for managing data for conventional transaction-oriented business applications. As organizations and companies have become more sophisticated, pressure to provide data integration across different, heterogeneous data sources has mounted. The problem how to provide organization-wide uniform access to heterogeneous and autonomous external data sources (file systems, databases, Web pages, etc.) can be addressed, genrally, in three different ways: federated databases, data warehousing systems, and mediated systems. This chapter introduces the reader to basic concepts of database systems and data integration. We start with a presentation of central ideas and foundations of database systems. After tracing the database systems’ evolution, we briefly explore the background, characteristics, advantages and disadvantages of the main database models: hierarchical, network, relational, and object-oriented. Then, the chapter discusses the basic approaches to data integration, and briefly describes each approach in detail.

18 - 48

10.1007/978-3-540-24742-5

https://link.springer.com/book/10.1007/978-3-540-24742-5

Handbook on Data Management in Information Systems