Download Database and Data Communication Network Systems, by Cornelius T. Leondes PDF

By Cornelius T. Leondes

ISBN-10: 0124438954

ISBN-13: 9780124438958

Книга Database and information communique community platforms, Three-Volume Set:... Database and knowledge communique community structures, Three-Volume Set: ideas and ApplicationsКниги English литература Автор: Milo Год издания: 2002 Формат: pdf Издат.:Academic Press Страниц: 952 Размер: 51,3 ISBN: 0124438954 Язык: Английский0 (голосов: zero) Оценка:Database and information conversation community structures examines the usage of the net and native Area/Wide region Networks in all components of human activity. This three-volume set covers, between different issues, database structures, info compression, database structure, facts acquisition, asynchronous move mode (ATM) and the sensible software of those applied sciences. The foreign selection of members used to be culled from exhaustive study of over 100,000 similar archival and technical journals. This reference could be essential to engineering and desktop technological know-how libraries, study libraries, and telecommunications, networking, and laptop businesses. It covers a various array of subject matters, together with:

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The key constraints assure that all instances of a table are distinct and the referential integrity constraints maintain consistency among instances of two tables. For example, if a student in a student class intends to take a course, we must assure that this course is actually offered in a course class. A DBMS should maintain the data consistency when data insertion, deletion, and modification are requested. To successfully design a relational database, a designer could start from two approaches: relational normalization or semantic data modeling.

2. , a relationship, between related objects. For example, a manager is associated with employees in his research department through the project relationship. Therefore, the project number can be an attribute of manager entities that link with employee entities. The number of entities involved in an association is indicated by a degree value. The minimum and maximum number of associations in which an entity can participate is defined in the cardiality ratio. The function of association is not explicitly implemented by most objectoriented prototypes.

And (5) shared project data repository [32]. The software utilities (1) can reduce the work of certain tasks for people using requirements specification and analysis tools, conceptual design tools, tools for view integration, tools for schema mapping among models, tools for physical design and optimization, and partitioning/allocation tools; (2) improve the performance of certain machines using performance monitoring, tuning, reorganizing, and reconstructing tools along with requirement tracing, configuration management, audits trails, dependency tracking, and data versioning.

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