| 一种改进的多关系半连接数据库查询算法研究 |
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| 作者单位： | 四川理工学院计算机科学系，四川理工学院后勤总公司 |
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| 摘 要： | 由于普通多关系半连接优化算法,分布式数据库系统的缓冲区不能作为查询的中间结果的最后装配站点,提出了改进普通多关系半连接的数据库查询优化算法,实验结果表明改进的多关系半连接的查询优化算法明显地减少了中间结果数据量,有效地降低了网络通信总代价。
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| 关 键 词： | 分布式数据库 查询优化 多关系半连接 |
An Improved Research on Query Optimized Algorithm of Distributed Database Based on Multi-Relation Semi Join |
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| Authors: | LIANG Ke-bing YAN Yan |
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| Abstract: | The buffer area in the distributed database can not be used as the final assembly site of temporary query result duo to the ordinary optimized algorithm of multi-relation semi join.The present article puts forward the improved algorithm of the query optimization algorithm based on multi-relation semi join.The experiment results indicate that the improved algorithm reduces the temporary result data number distinctly and reduces the total network communication cost efficiently. |
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| Keywords: | distributed database query optimization multi-relation semi join |
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