Advanced Database Technology and Design (Artech House by Mario Piattini

By Mario Piattini

An advent to advancements in database platforms layout offered from an functions standpoint. that includes contributions from specialists within the box, it will pay exact realization to matters raised via new tendencies in database layout, and the way those advancements impact the programmer and database administrator.

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In some cases, however, events have duration. To handle those cases in conceptual models that require instantaneous events, it may be necessary to refine the conceptual schema of the domain or the event itself. For example, assume the domain includes the relationship type Is at between persons and places. In principle, it seems natural to consider that persons are at some place at any moment. Let us consider now the event corresponding to the move of a person from an origin to a target. If we assume that the event is instantaneous, then the person will continue to be at some place at any An Introduction to Conceptual Modeling of Information Systems 41 moment.

Government Printing Office, Vol. 3, No. 4, 1978, pp. 147–320. [4] Codd, E. , “A Relational Model of Data for Large Shared Data Banks,” Comm. ACM, Vol. 13, No. 6, 1970, pp. 377–387. [5] Ullman, J. , Database and Knowledge-Base Systems, Rockville, MD: Computer Science Press, 1988. , and J. Melton, “Standards—SQL: 1999 (Formerly Known as SQL3),” SIGMOD Record, Vol. 28, No. 1, 1999, pp. 131–138. , and M. Piattini, Concepción y Diseño de Bases de Datos: Del Modelo E/R al Modelo Relacional, Wilmington, DE: Addison-Wesley Iberoamericana, 1993.

A higher degree of distribution is offered by mobile DBs (see Chapter 10), which can be considered distributed systems in which links between nodes change dynamically. From that point of view, we must also emphasize the integration of DBs and the Internet and the World Wide Web. The Web adds new components to DBs, including a new technology for the graphical user interface (GUI), a new client/server model (the hypertext transfer protocol, HTTP), and a hyperlink mechanism between DBs [27]. New architectures capable of connecting different software components and allowing the interoperation between them are needed.

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