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Genre/Form: | Thèses et écrits académiques |
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Additional Physical Format: | Le Système d'aide a la conception de la base de données du SGBD SCRABBLE The aided design system of SCRABBLE DBMS data base / par José Moréjon Lille : Atelier national de reproduction des thèses, 1987 3 microfiches (ABES)261541129 |
Material Type: | Thesis/dissertation, Manuscript |
Document Type: | Book, Archival Material |
All Authors / Contributors: |
José Moréjon; André Flory; Institut national des sciences appliquées de Lyon (Lyon).; LIA - Laboratoire d'Informatique Appliquée (Lyon). |
OCLC Number: | 1056977763 |
Description: | 1 vol. (268p.) : schém. ; 30 cm. |
Responsibility: | par José Moréjon ; sous la direction de André Flory. |
Abstract:
Relational DBMS have progressed rapidly in recent years. We now have commercially viable relational DBMS to effectively store and retrieve large quantities of data from micro computers to very large computers. Meanwhile the information system design methods became more useful and practical. For the most part, researchers in these two areas have developed their works independently and as far as we know, very few works have been done to merge an aided design system into a DBMS. The combined use of a DBMS and an aided design system is then potentially very valuable for DB application. The purpose of this work is to propose such a system in order to help the designer to get a right data structure and integrate this structure in the data dictionary. An extended Entity-Relationship Model, which offers a wider semantics than the classical Relational Model is used. The designer expresses the users needs from a set of documents of a given company, then the system builds a set of data dictionaries which are exploited by ether functions of the system. The implementation of data is also studied here. We suppress the physical links between data in replacing them by logical links which lead to a storage method called "vectorial". This absence of links allows, for present developments, to modify easily the conceptual structure of the data base and leads to a modular system of design. Our contribution essentially consists in the proposal of an friendly system can be used by a casual user in a very efficient way. The user will be able to employ efficiently without experience in data base. In that purpose, handled concepts are simple, and a help is provided at each level to get the wished result. This system does not require knowledge in data base theory. A help function can be used at each step of the design process.
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