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arXiv 1908.10598cs.IR
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倒排索引压缩技术

Techniques for Inverted Index Compression

Giulio Ermanno Pibiri, Rossano Venturini

摘要:

大型搜索引擎核心的数据结构是倒排索引,它本质上是一个被称为倒排列表的排序整数序列的集合。由于这些引擎索引的文档很多,而且查询的负载很重,对性能的要求也很严格,因此倒排索引存储了数十亿个必须高效搜索的整数。在这种情况下,索引压缩是必不可少的,因为它可以更好地利用计算机的存储层次结构来进行更快的查询处理,同时还可以减少存储机器的数量。本文的目的是双重的:第一,调查适合于倒排索引压缩的编码算法,第二,通过实验表征倒排索引的性能。

英文摘要:

The data structure at the core of large-scale search engines is the inverted index, which is essentially a collection of sorted integer sequences called inverted lists. Because of the many documents indexed by such engines and stringent performance requirements imposed by the heavy load of queries, the inverted index stores billions of integers that must be searched efficiently. In this scenario, index compression is essential because it leads to a better exploitation of the computer memory hierarchy for faster query processing and, at the same time, allows reducing the number of storage machines. The aim of this article is twofold: first, surveying the encoding algorithms suitable for inverted index compression and, second, characterizing the performance of the inverted index through experimentation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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