An Integrated Approach to Data tush Design
M. HAMED University of Bahrain, College of Science, Dept. ofComp. Sci., Isa Town, Bahrain
ABSTRACf. In this paper, a new method acting for data buttocks initiation is proposed. The method mflkes use of close to good features in different design approaches. Based on the results of a preliminary exam phase of determining user requirements, an initial design is freshman developed. Then the design is tuned according to some pre-d~fined changes in twain the logical model and the physical representation. Response time is utilise as a measure of the effectiveness of the design. Algorithms to implement the method are developed. Selection of the best design model (logical and physical) is left-hand(a) to the data base administrator (DBA). Results obtained from running the proposed algorithms can be used to help the DBA in taking the appropriate decision.
1. foundation Design of data bases is mostly done through devil main consecutive phases: logical and physical design phases. transparent design can be defined as: classify of attributes into entities and building relationships between entities. Logical design may 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 can be expressed 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 such as: selection 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.
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M. Hamed
The separation of the two phases (logical and physical) is meant mainly to tick independence. Despite that, it can be claimed that the mapping process from...If you require to get a full essay, order it on our website: Ordercustompaper.com
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