Methodologies for Distributed Database Design

对分布式数据库的设计进行了研究。我们已经详细研究了分布式环境中数据的垂直和水平碎片以及它们的冗余和非冗余分配问题。通过本提案，我们计划扩大我们在以下领域的研究：a)通过将分段和分配方案结合起来，将目前的工作整合为一种全面的方法。通过纳入交易处理和系统管理费用的更多细节来改进现有模型。研究网络拓扑和通信成本的影响。B)研究在可能复制的情况下进行最佳重新碎片整理和重新分配的模型。开发设计启发式方法。C)调查设计工具、用户交互、图形支持等方面的发展，使设计人员能够将实践中的设计方法应用于现实问题。特别是，评估设计启发式在类似专家系统的环境中的适用性，以获得设计问题的相当可接受的解决方案。

Research on the design of distributed databases is proposed. We have already investigated in detail the problems of vertical and horizontal fragmentation of data and their redundandt and nonredundant allocation in a distributed environment. With the present proposal, we plan to extend our research in the following areas: a) Integrate the present work into a comprehensive methodology by combining the fragmentation and allocation schemes. Refine existing models by incorporating further details of transaction processing and system overheads. Study the effect of network topology and communication costs. b) Investigate models for optimal refragmentation and reallocation with possible replication. Develop design heuristics. c) Investigate the development of design tools, user interaction, graphic support, etc., to enable designers to apply the design methodology in practice to realistic problems. In particular, evaluate the applicability of design heuristics in a expert- system like environment to achieve fairly acceptable solutions to the design problem.