| Agent在分布式数据库查询优化中的应用 |
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| 引用本文： | 许新华,吴铁柱,张国雄.Agent在分布式数据库查询优化中的应用[J].孝感职业技术学院学报,2008,11(3):95-98. |
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| 作者姓名： | 许新华 吴铁柱 张国雄 |
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| 作者单位： | [1]湖北职业技术学院信息技术学院,湖北孝感432000 [2]孝感市工业和信息化局,湖北孝感432000 [3]孝感市劳动局信息中心,湖北孝感432000 |
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| 摘 要： | 前分布式数据库查询优化器基于代价模型，总代价=CPU代价＋I／O代价＋通信代价，在远程通信网或数据传输率较低的系统中，通信代价应作为首要的优化目标来考虑。文章提出了一种基于Multi—Agent技术的查询模型（QMAS），同时为了保证系统组内、组间Agent之间的高效通信，采用了树型拓扑结构（TrMAS）的通信模型，系统内各Agent使用通信原语高效通信、协作，且满足Agent间的通信路由最优，从而保证了QMAS的查询效率。
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| 关 键 词： | 分布式数据库 查询优化 传输代价 Agent QMAS TTMAS |
Application of Agent in Query Optimization for Distributed Database |
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| XU Xin-hua,WU Tie-zhu,ZHANG Guo-xiong.Application of Agent in Query Optimization for Distributed Database[J].Journal of Xiaogan Vocational-Technical College,2008,11(3):95-98. |
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| Authors: | XU Xin-hua WU Tie-zhu ZHANG Guo-xiong |
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| Institution: | XUXin - hua, WUTie - zhu, ZHANGGuo - xiong (1. Hubei Polytechnic Institute, Xiaogan, Hubei 432000; 2. Industry and Information Technology Bureau of Xiaogan, Hubei 432000; 3. Information Center of Labor Bureau of Xiaogan, Hubei 432000) |
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| Abstract: | Currently distributed database query optimizer is based on the cost model. The total cost is the combination of CPU cost and I/O cost of communication. In the telecommunications network or in the lower data transfer rate system, communications cost should be considered as the primary goal of optimizing. The query model based on Multi - Agent （QMAS） is proposed. In order to ensure the high efficiency of communications between the agents of the system＇s groups, the communication model Tree Topology Multi - Agent System （TFMAS） is also adopted. Every agent in this system communicates and collaborates at high efficiency by using communication primitive to observe the optimality principle, thereby ensuring the query efficiency in QMAS. |
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| Keywords: | Agent QMAS TTMAS |
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