| 摘要: |
| 随着正文数据应用的迅速增长,对正文数据检索方法的研究已成为数据库领域中令人感兴趣的课题之一。本文结合我国办公环境的特点,提出一种新的按附加码方法组织字标 识文件的正文数据库检索方法。这种方法不仅没有一般标识文件方法特有的“误选”现象,不必对查找标识文件后得出的文献进行全文扫描,而且处理查询时只需对标识文件进行范围查找,因此,其查询效率在较大范围内可以与正文检索方法中效率最高的倒排文件方法相近,并同时保持其它正文检索方法不具有的适应动态信息检索环境的优点。 |
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| A TEXT DATA BASE ACCESS METHOD FOR CHINESE DYNAMIC OFFICE ENVIRONMENT |
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Liu Yi
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| Abstract: |
| With the rapid growth of text database applications, the research of text access methods has become one of the most interesting topics in database area. According to the characters of Chinese office environment, this paper proposes a new text data base retrieval method which organizes the word signature file in the light of their superimposed coding signature. The method has no false drop that is unavoidable in other signature file methods. So it does not need to scan the full text obtained by searching the signature index .When aqiery is processed,only range scan to the signature file is required.Therefore,within a rather wide scope,the performance of our method is approximate to the inversion which is the fastest one among all the text access methods.In the meantime,it also maintains the merit of fitting dynamic information retrieval environment,that can not be found in other kinds of text access method. |
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