全文索引技术时空效率分析

全文索引技术(full-text index technique)作为提高全文检索时空效率的有效方式之一,近年来得到了广泛而深入的研究.根据全文索引实现技术的不同,将其分为三大类:索引技术、压缩与索引混合技术以及自索引技术(self-index technique).从上述分类角度综述了全文索引时空效率方法中具有代表性的一些方法和技术:倒排文件、签名文件、后缀树与后缀数组、基于这3 种索引的压缩技术、基于倒排文件的自索引与基于后缀数组的自索引的基本原理、所面临的问题及进展,并对这些技术的时空性能进行了详细的分析和比较,分析了各种技术的适应环境及优劣.最后总结了上述技术的特点,指出了存在的问题以及未来的研究方向.

Time and Space Efficiencies Analysis of Full-Text Index Techniques

As one of the efficient methods of improving time and space efficiencies, the full-text index technique has been well studied in recent years. According to the implementation ways, it can be classified into three categories: Index technique, hybrid technique of index and compression, self-index technique. This paper reviews the recent researches on this topic, which include the main techniques such as inverted files, signature files, suffix trees, suffix arrays, compressed indices based on the indices mentioned above, self-index based on inverted files, and self-index based on suffix arrays. This paper also introduces the basic theories, problems, progress as well as space and time efficiencies of these techniques. Through a detailed efficiency analysis and comparison, the pros and cons of the techniques are given. Finally, the important features of these techniques are summarized, and the future research strategies and trends directions are pointed out as well.