| 摘要: |
| 集合类型是面向对象数据库和对象．关系数据库申的一种重要的数据类型，但是目前还缺少支持相关查询的有效的索引结构．提出了集合类型数据的一种索引结构：Settrie，这种结构是基于数据库中数据的公共前缀构造的，与Invertfile不同，在Settrie中重复的数据得以合理地组织，所以查询中访问的数据量比Invert file 小,提高了选择操作的性能．通过实验证明：这种方法相比Invert file提高了集合数据上的各种相交选择操作的性能，同时还讨论了时Settrie的几种优化方法． |
| 关键词: 集合索引 Settrie 倒排文件 选择操作 相交 |
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| 基金项目:Supported by the National Natural Science Foundation of China under Grant Nos．69933010,60303008(国家自然科学基金)；the National High-Tech Research and Dcvelopment Plan of China under Grant No．2002AA423430(国家高技术研究发展计划(863)) |
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| Efficient Processing of Large Intersection Queries on Set_Valued Data |
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WANG Wei,XIE Min-Fen,LIU Guo-Hua,PANG Yin-Ming,SHI Bai-Le
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| Abstract: |
| Set is a common data type in database system today．But there is no efficient index structure for set type data to support the queries relate to it．This paper presents a structure called SetUie．The stlxlcture is built based on the common prefix patterns in database．Unlike invert file，the sets with salne value are well organized．So the size of the data accessed by a query is smaller than that of invert file．This feature will cause the improvement of the selection operation’s performance．The experiments support this result．In this paper We also discuss several eptimizations approaches to Settrie． |
| Key words: index of set Settrie invert file select operation Intersection |
