A Probabilistic Model for Data Cube Compression and Query Approximation

Missaoui, Rokia and Goutte, Cyril and Kouomou Choupo, Anicet and Boujenoui, Ameur (2007) A Probabilistic Model for Data Cube Compression and Query Approximation. [Conference Paper] (In Press)

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Databases and data warehouses contain an overwhelming volume of information that users must wade through in order to extract valuable and actionable knowledge to support the decision-making process. This contribution addresses the problem of automatically analyzing large multidimensional tables to get a concise representation of data, identify patterns and provide approximate answers to queries. Since data cubes are nothing but multi-way tables, we propose to analyze the potential of a probabilistic modeling technique, called non-negative multi-way array factorization, for approximating aggregate and multidimensional values. Using such a technique, we compute the set of components (clusters) that best fit the initial data set and whose superposition approximates the original data. The generated components can then be exploited for approximately answering OLAP queries such as roll-up, slice and dice operations. The proposed modeling technique will then be compared against the log-linear modeling technique which has already been used in the literature for compression and outlier detection in data cubes. Finally, three data sets will be used to discuss the potential benefits of non-negative multi-way array factorization.

Item Type:Conference Paper
Keywords:Data warehousing, data cubes, OLAP, approximation, compression, data mining, non-negative multi-way array factorization, log-linear modeling
Subjects:Computer Science > Statistical Models
Computer Science > Artificial Intelligence
ID Code:5702
Deposited By: Goutte, Dr. Cyril
Deposited On:10 Sep 2007
Last Modified:11 Mar 2011 08:56

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