| 带回路的多元连接并行查询优化实现技术研究 |
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| 引用本文： | 李庆华,陈松青,胡耀东. 带回路的多元连接并行查询优化实现技术研究[J]. 华中科技大学学报(自然科学版), 1998, 0(3) |
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| 作者姓名： | 李庆华 陈松青 胡耀东 |
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| 作者单位： | 华中理工大学计算机科学与技术学院 |
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| 基金项目： | 国家高技术研究发展计划,国家高性能计算基金 |
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| 摘 要： | 主要研究带回路的多元连接查询优化技术，用实例论证了分段右深树方法不适用于带回路的多元连接查询，并分析了其失败的原因．在此基础上，提出了改进措施，形成了适用于带回路的多元连接查询的优化技术．为解决带回路的多元连接查询优化问题提供了一种可行的途径．
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| 关 键 词： | 并行查询优化；SRD；收缩；连接图 |
On the Realization of Optimization of Cyclic Multiple Access Qury |
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| Li Qinghua Prof., College of Computer Sci. , Tech.,HUST,Wuhan ,China. Chen Songqing Hu Yaodong. On the Realization of Optimization of Cyclic Multiple Access Qury[J]. JOURNAL OF HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY.NATURE SCIENCE, 1998, 0(3) |
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| Authors: | Li Qinghua Prof. College of Computer Sci. & Tech. HUST Wuhan China. Chen Songqing Hu Yaodong |
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| Affiliation: | Li Qinghua Prof., College of Computer Sci. & Tech.,HUST,Wuhan 430074,China. Chen Songqing Hu Yaodong |
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| Abstract: | The optimization technique of multiple access queries is investigated. A practical example is used to demonstrate that the segmented right deep tree method is invalid to such queries and the reason why it is unsuccessful is discussed. Measures to improve the situation are proposed, and optimization techniques feasible for both the cyclic and non cyclic multiple access queries have been developed. |
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| Keywords: | optimization of parallel queries segmented right deep tree shrinking connection graph |
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