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Improving Table Compression with Combinatorial Optimization (2002)
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BibTeX
@MISC{Buchsbaum02improvingtable,
author = {Adam L. Buchsbaum and et al.},
title = {Improving Table Compression with Combinatorial Optimization },
year = {2002}
}
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Abstract
We study the problem of compressing massive tables within the partition-training paradigm introduced by Buchsbaum et al. [SODA’00], in which a table is partitioned by an off-line training procedure into disjoint intervals of columns, each of which is compressed separately by a standard, on-line compressor like gzip. We provide a new theory that unifies previous experimental observations on partitioning and heuristic observations on column permutation, all of which are used to improve compression rates. Based on the theory, we devise the first on-line training algorithms for table compression, which can be applied to individual files, not just continuously operating sources; and also a new, off-line training algorithm, based on a link to the asymmetric traveling salesman problem, which improves on prior work by rearranging columns prior to partitioning. We demonstrate these results experimentally. On various test files, the on-line algorithms provide 35–55 % improvement over gzip with negligible slowdown; the off-line reordering provides up to 20 % further improvement over partitioning alone. We also show that a variation of the table compression problem is MAX-SNP hard.
Keyphrases
table compression combinatorial optimization individual file new theory first on-line training algorithm off-line reordering off-line training procedure on-line compressor off-line training algorithm salesman problem various test file negligible slowdown disjoint interval compression rate massive table max-snp hard partition-training paradigm column permutation prior work heuristic observation on-line algorithm previous experimental observation table compression problem
