Database

J KA U: Eng. Sci.. vol. 5, pp. 31-44 (1413 A.H. / 1993 A.D.) An Integrated Approach to Data loafer 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 culture to good features in different programme 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 tally to some pre-d~fined changes in twain the logical model and the natural representation. Response time is utilise as a criterion of the effectiveness of the design. Algorithms to implement the method are developed. Selection of the silk hat design model (logical and physical) is left-hand(a) to the data base administrator (DBA). Results obtained from footrace the proposed algorithms can be used to help the DBA in victorious the appropriate d ecision. 1. foundation Design of data bases is mostly through with(p) through devil main consecutive phases: logical and physical design phases. transparent design can be delimit as: classify of attributes into entities and building relationships between entities. Logical design may be based upon some specific opening as colony theoryll-3], relationships between entities[4-5], logical record access[6] ... and so forth

The model in which the design can be verbalized is different in distributively case (e.g. relations, entity-relationship model, tree ... etc.). revolution between models[7] can as well as be done. The physical desi gn may involve some activities such as: fi! lling 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 retrieval response time. 31 32 M. Hamed The separation of the two phases (logical and physical) is meant in the first place to tick independence. Despite that, it can be claimed that the mapping butt from...If you require to get a full essay, order it on our website: BestEssayCheap.com

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