Reducing Space Requirements for Disk Resident Suffix Arrays
AuthorMoffat, A; Puglisi, SJ; Sinha, R
Source TitleDATABASE SYSTEMS FOR ADVANCED APPLICATIONS, PROCEEDINGS
AffiliationComputer Science And Software Engineering
Document TypeConference Paper
CitationsMoffat, A., Puglisi, S. J. & Sinha, R. (2009). Reducing Space Requirements for Disk Resident Suffix Arrays. Zhou, X (Ed.) Yokota, H (Ed.) Deng, K (Ed.) Liu, Q (Ed.) DATABASE SYSTEMS FOR ADVANCED APPLICATIONS, PROCEEDINGS, 5463, pp.730-+. SPRINGER-VERLAG BERLIN. https://doi.org/10.1007/978-3-642-00887-0_63.
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F1 - Full Written Papers Refereed
Suffix trees and suffix arrays are important data structures for string processing, providing efficient solutions for many applications involving pattern matching. Recent work by Sinha et al. (SIGMOD 2008) addressed the problem of arranging a suffix array on disk so that querying is fast, and showed that the combination of a small trie and a suffix array-like blocked data structure allows queries to be answered many times faster than alternative disk-based suffix trees. A drawback of their LOF-SA structure, and common to all current disk resident suffix tree/array approaches, is that the space requirement of the data structure, though on disk, is large relative to the text – for the LOF-SA, 13n bytes including the underlying n byte text. In this paper we explore techniques for reducing the space required by the LOF-SA. Experiments show these methods cut the data structure to nearly half its original size, without, for large strings that necessitate on-disk structures, any impact on search times.
KeywordsInformation and Computing Sciences not elsewhere classified; Information and Communication Services not elsewhere classified
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