| 摘要: |
| 提出了一种基于词频统计的方法以估算Web数据库的规模.通过分析Web数据库查询接口中属性之间的相关度来获取某个属性上的一组随机样本;并对该属性分别提交由前k位高频词形成的试探查询以估算Web数据库中记录的总数.通过在几个真实的Web数据库上进行实验验证,说明该方法可以准确地估算出Web数据库的大小. |
| 关键词: 词频 Web数据库大小估计 属性相关度 |
| DOI： |
| 分类号: |
| 基金项目:Supported by the National Natural Science Foundation of China under Grant No.60573091 (国家自然科学基金); the National High-Tech Research and Development Plan of China under Grant No.2007AA01Z155 (国家高技术研究发展计划(863)); the Program for New Century Excellent Talents in University of China (新世纪优秀人才支持计划); the Beijing Natural Science Foundation of China under Grant No.4073035 (北京市自然科学基金) |
|
| An Attributes Correlation Based Approach for Estimating Size of Web Databases |
|
LING Yan-Yan,MENG Xiao-Feng,LIU Wei
|
| Abstract: |
| An approach based on the word frequency is proposed in this paper to estimate the size of Web database. It obtains a random sample on a certain attribute by analyzing the attribute correlations among all the textual attributes in the query interface. The size of a Web database can be estimated by submitting probing queries which are generated by top-k frequent words to the query interface of a Web database. The experiments on several real-world databases have proved that this approach is effective and can achieve high accuracy in estimating the size of Web databases. |
| Key words: word frequency Web database size estimation attributes correlation |
