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Content Provider | IEEE Xplore Digital Library |
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Author | Litwin, W. Mokadem, R. Rigaux, P. Thomas, S. |
Copyright Year | 2006 |
Description | Author affiliation: Dauphine Univ., Paris (Litwin, W.; Mokadem, R.; Rigaux, P.) |
Abstract | We propose a novel string (pattern) matching algorithm called n-gram search. We intend it for the records stored once and searched many times in a database or a file, especially those organized in a scalable distributed data structure, (SDDS), over a grid or a structured P2P net. We presume that the records are encoded into their cumulative algebraic signatures, providing incidental confidentiality of stored data. The search starts with pre-processing the pattern, calculating the logarithmic algebraic signature (LAS) of the pattern and the LASs of every n-gram in it. The value of n ges 1 is a parameter that one may tune. The search attempts to match the LASs of n-grams in the pattern towards dynamically calculated LASs, sampled over n-grams in the records. A mismatch generates a shift of up to K - n symbols towards next sample, where K is the pattern length. The whole process is parallel over the SDDS servers and does not require any local decoding. For an M-symbol long record, the unsuccessful search, measured as number of match attempts, costs O ((M - K)/(K - n+1)). The 2-grams should typically suffice, leading to O ((M - K)/(K - 1)). We show that the algorithm particularly efficient for larger strings and records, i.e., with e-documents or DNA data. Preliminary results show then the n-gram search about (K - n + 1) faster than our previous algorithms and among the fastest known, e.g., probably often faster than Boyer-Moore |
Sponsorship | CPS |
Starting Page | 251 |
Ending Page | 255 |
File Size | 135827 |
Page Count | 5 |
File Format | |
ISBN | 0769526411 |
ISSN | 15294188 |
DOI | 10.1109/DEXA.2006.80 |
Language | English |
Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Publisher Date | 2006-09-04 |
Publisher Place | Poland |
Access Restriction | Subscribed |
Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Subject Keyword | Special issues and sections Pattern matching Sampling methods Content addressable storage Distributed databases Data structures Decoding Costs DNA Galois fields algebraic signatures. SDDS grid structured P2P scalable distributed pattern matching |
Content Type | Text |
Resource Type | Article |
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