Part 1 - Introduction
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Publisher SummaryThis chapter introduces the reader to the concept of database. A database is a collection of non-redundant data shareable among different application systems. The chapter explores the definition of database, non-redundant data, need for sharing the data, problems arising in sharing data, and the ways to overcome the problems by considering the problems encountered by a mythical manufacturing company, Torg Ltd, in the development of its computer systems. The chapter also gives a detailed description of the methods used by the management of Torg Ltd for the development of its computerized system. Torg Ltd started by implementing a simple catalogue system and encouraged by the success of the catalogue system, it decided to try something a little more ambitious—namely, a stock control system for the stores department that was thoroughly tested and put in operation but was unsuccessful. The management later scrutinized the reasons behind the discrepancies of stock control system and it was apparent that separate updating of the catalogue and stock files would almost inevitably lead to inconsistent data. The chapter also summarizes the problems experienced by Torg Ltd.

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