Database

J KA U: Eng. Sci.. vol. 5, pp. 31-44 (1413 A.H. / 1993 A.D.) An co-ordinated Approach to Data screwing Design M. HAMED University of Bahrain, College of Science, Dept. ofComp. Sci., Isa Town, Bahrain ABSTRACf. In this paper, a freshly mode acting for information buttocks initiation is proposed. The rule mflkes use of close to pricy features in different conception approaches. Based on the results of a preliminary exam course of determining user controlments, an initial number is freshman developed. thusly the end is tuned according to rough(a) pre-d~fined changes in twain the ordered model and the physiologic representation. response time is utilise as a measure of the effectualness of the excogitate. Algorithms to implement the method ar developed. Selection of the best design model ( licit and physical) is left-hand(a) to the data hateful administrator (DBA). Results obtained from running the proposed algorithms raise be used to serve well the DBA in taking the admit decision. 1. foundation Design of data bases is mostly done finished devil main square(a) phases: logical and physical design phases. transparent design foundation be defined as: classify of attributes into entities and building relationships amid entities. Logical design whitethorn be based upon some specific theory as colony theoryll-3], relationships between entities[4-5], logical record access[6] ... etc.

The model in which the design potful be expressed is different in distributively case (e.g. relations, entity-relationship model, direct ... etc.). Transformation between models[7] can as well as be done. The physical design may involve some activities such as: survival of the fittest of file organization to separately entity, selection of a method of implementing relationships between entities and implementing inverted files. For example, the trend of the design of a physical model could be the minimisation of retrieval response time. 31 32 M. Hamed The dissolution of the two phases (logical and physical) is meant mainly to distinguish independence. Despite that, it can be claimed that the mapping process from...If you require to get a exuberant essay, order it on our website: Orderessay

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