| 语义完整性在查询优化中的应用 |
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| 引用本文： | 许向阳,冯玉才.语义完整性在查询优化中的应用[J].小型微型计算机系统,1996,17(10):35-39. |
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| 作者姓名： | 许向阳 冯玉才 |
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| 作者单位： | 华中理工大学计算机系数据库所 |
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| 摘 要： | 本文分析了语义完整性 规则在查询优化中的作用，提出了利用完整性规则改写查询，以便为传统查询优化器优化机会的思想。文章给出了查询转换的实现方法，包括约束目标的确定，完整性规则的选择，约束的推理，约束的合并及等价查询的生成等。初步试验表明，采用语义优化的方法是非常有效的。
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| 关 键 词： | 数据库 语义完整性 查询优化 |
APPLICATION OF SEMANTIC INTEGRITY IN QUERY OPTIMIZATION |
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| Xu Xiangyang, Feng Yucai, Wang Yuanzhen.APPLICATION OF SEMANTIC INTEGRITY IN QUERY OPTIMIZATION[J].Mini-micro Systems,1996,17(10):35-39. |
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| Authors: | Xu Xiangyang Feng Yucai Wang Yuanzhen |
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| Abstract: | In this paper, the value of semantic integrity in query optimization is analysised.The idea of using integrity rule to rewrite query expression, which contain more opportunity for query optimization, is put forward. An implementation including identification of constraint targets,selection of rules, generation of new constraints and formulation of semantically equivalent querys is given out. According to the test, this method is very useful and efficient. |
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| Keywords: | Database Semantic Integrity Query Optimization |
| 本文献已被 CNKI 维普 等数据库收录！ |
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