Authors: Xiong Wang
Addresses: Department of Computer Science, California State University, Fullerton, P.O. Box 6870, Fullerton, CA 92834-6870, USA
Abstract: Entity-relationship modelling is an effective design method for relational databases. It is covered in almost every textbook on database systems. Yet, there is not a single book that gives a systematic process on building an entity-relationship model step-by-step from the requirement specifications. In this paper, a zoom in and zoom out approach for such a process is introduced. A toolkit called ERZoom has been developed to assist the designer in the zoom in and zoom out design process. ERZoom provides a unique feature that enables the designer to view a selected subset of the entities and their attributes, while hiding the rest of the entity-relationship model. This is especially useful in distributed database design where vertical fragmentation is a major issue. ERZoom is developed as an open source package using Java. The zoom in and zoom out approach has been taught to beginners for several years and was well-received by the audience.
Keywords: entity-relationship modelling; conceptual modelling; relational database design; data modelling; distributed database design.
International Journal of Data Mining, Modelling and Management, 2009 Vol.1 No.4, pp.357 - 374
Available online: 29 Oct 2009 *Full-text access for editors Access for subscribers Purchase this article Comment on this article