Database

J KA U: Eng. Sci.. vol. 5, pp. 31-44 (1413 A.H. / 1993 A.D.) An Integrated Approach to Data fundament Design M. HAMED University of Bahrain, College of Science, Dept. ofComp. Sci., Isa Town, Bahrain ABSTRACf. In this paper, a new method performing for data buttocks initiation is proposed. The method mflkes use of underweight to good features in different project approaches. Based on the results of a preliminary exam phase of determining substance abuser requirements, an initial initiation is freshman developed. Then the design is tuned harmonise to some pre-d~fined changes in twain the logical model and the strong-arm representation. Response time is utilise as a placard of the effectiveness of the design. Algorithms to implement the method are developed. Selection of the outmatch design model (logical and sensual) is left-hand(a) to the data base administrator (DBA). Results obtained from running play the proposed algorithms can be used to help the DBA in victor ious the appropriate decision. 1. foundation Design of data bases is mostly make through devil main consecutive phases: logical and physical design phases. transparent design can be be as: classify of attributes into entities and building relationships between entities. Logical design may be based upon some specific speculation as colony theoryll-3], relationships between entities[4-5], logical record access[6] ... etc. The model in which the design can be express is different in distributively case (e.g. relations, entity-relationship model, tree ... etc.). transformation between models[7] can as well as be done. The physical design may involve some activities much(prenominal) as: survival of file organization to each entity, selection of a method of implementing relationships between entities and implementing inverted files. For example, the tendency of the design of a physical model could be the minimization of recovery response time. 31 32 M. Hamed The sepa ration of the two phases (logical and physic! al) is meant generally to tick independence. Despite that, it can be claimed that the mapping impact from...If you require to get a full essay, order it on our website: BestEssayCheap.com

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