NDLI: SUPRA: a sampling-query optimization method for large-scale OLAP

Content Provider	IEEE Xplore Digital Library
Author	Ushijima, K. Fujiwara, S. Nishizawa, I. Sagawa, N.
Copyright Year	1998
Description	Author affiliation: Central Res. Lab., Hitachi Ltd., Tokyo, Japan (Ushijima, K.)
Abstract	Relational online analytical processing (ROLAP) reduces the amount of storage required for maintaining various sizes of data cubes by materializing only parts of them in a lazy evaluation manner. In ROLAP however, cube creation queries need to be issued repeatedly in order to search for useful features (i.e. rules or patterns) within large scale databases. The cube creation cost can be a bottleneck in the whole ROLAP processing. The cost of the queries can be effectively reduced by estimating the query results using samples. To maintain the accuracy of ROLAP even when using samples, the samples need to be extracted in an appropriate unit. However, conventional query optimization methods only support record based sampling and cannot be applied for complex queries that have other sampling units, such as the ones that include grouping aggregate operations. We develop a query optimization method named SUPRA that preserves the sampling unit used in random data extraction. The method is designed to preserve both the sampling unit and the randomness of the sampling operation. Using this method, typical ROLAP queries can be transformed into more efficient ones than those obtained through conventional methods.
Starting Page	232
Ending Page	237
File Size	62017
Page Count	6
File Format	PDF
ISBN	0818683538
DOI	10.1109/DEXA.1998.707408
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-08-26
Publisher Place	Austria
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optimization methods Large-scale systems Sampling methods Material storage Costs Query processing Spatial databases Aggregates Data mining Design methodology
Content Type	Text
Resource Type	Article

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