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- W2014764233 abstract "Distributed Data bases (DDB), which have been for many yearsthe object of research and experiment, are now reaching a moreprecise role in the world of informatics. Among the aims of a DDBsystem the following seem to have a major relevance :• To put data closer to their users .• To avoid too much resources centralization which couldcause a worsening of system efficiency and efficacy .• To enhance system reliability.• To ease data base maintenance and restructuring opera-tions while maintaining a high availability rate .• To tailor the EDP structure to the functional and organiza-tional structure of the organization.• To increase the utilization factor of EDP systems .Reaching these objectives entails the solution of a number oftechnical problems. Among them we mention:• An integrated DDB access capability.• The transparency to the user of the physical data allocation .• The logical, physical and distributive data independence .• The software portability .• An efficient cataloging system .To most of these problems, solutions have been already givenfor centralized DB, such as the data independence problem' .However, in the DDB environment the solution to this problem, aswell as to others, can be much more difficult and, even if manyproposals have been made by different researchers 2, in manycases it has not yet been attained satisfactorily. Data indepen-dence, in fact, must be assured not only at a local level, but alsowith respect to a possible data reallocation among the nodes o fthe information network.The authors are on the faculty of the lstituto de Elettrotecnica edElettronica in Milan, Italy.12" @default.
- W2014764233 created "2016-06-24" @default.
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- W2014764233 date "1979-07-01" @default.
- W2014764233 modified "2023-09-25" @default.
- W2014764233 title "Creating a conceptual model of a data dictionary for distributed data bases" @default.
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- W2014764233 doi "https://doi.org/10.1145/1017612.1017614" @default.
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