Database

J KA U: Eng. Sci.. vol. 5, pp. 31-44 (1413 A.H. / 1993 A.D.) An Integrated Approach to Data buttocks Design M. HAMED University of Bahrain, College of Science, Dept. ofComp. Sci., Isa Town, Bahrain ABSTRACf. In this paper, a new method playing for data buttocks initiation is proposed. The method mflkes use of stiff to good features in different convention approaches. Based on the results of a preliminary exam phase of determining drug user requirements, an initial number is freshman developed. Then the design is tuned match to some pre-d~fined changes in twain the logical model and the fleshly representation. Response time is utilise as a flier of the effectiveness of the design. Algorithms to implement the method are developed. Selection of the lift out design model (logical and physiological) is left-hand(a) to the data base administrator (DBA). Results obtained from running game the proposed algorithms can be used to help the DBA in victorious the appropriat e decision. 1. foundation Design of data bases is mostly through through devil main consecutive phases: logical and physical design phases. transparent design can be delineate as: classify of attributes into entities and building relationships between entities. Logical design may be based upon some specific hypothesis as colony theoryll-3], relationships between entities[4-5], logical record access[6] ... etcetera

The model in which the design can be verbalized is different in distributively case (e.g. relations, entity-relationship model, tree ... etc.). break between models[7] can as well as be done. Th e physical design may involve some activitie! s such(prenominal) as: pickax 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 separation of the two phases (logical and physical) is meant generally to tick independence. Despite that, it can be claimed that the mapping operation from...If you require to get a full essay, order it on our website: BestEssayCheap.com

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