Hierarchies and relative operators in the OLAP environment

In the last few years, numerous proposals for modelling and querying Multidimensional Databases (MDDB) are proposed. A rigorous classification of the different types of hierarchies is still an open problem. In this paper we propose and discuss some different types of hierarchies within a single dime...

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Bibliographic Details
Published in:SIGMOD record 2000-03, Vol.29 (1), p.32-37
Main Authors: Pourabbas, Elaheh, Rafanelli, Maurizio
Format: Article
Language:English
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Summary:In the last few years, numerous proposals for modelling and querying Multidimensional Databases (MDDB) are proposed. A rigorous classification of the different types of hierarchies is still an open problem. In this paper we propose and discuss some different types of hierarchies within a single dimension of a cube. These hierarchies divide in different levels of aggregation a single dimension. Depending on them, we discuss the characterization of some OLAP operators that refer to hierarchies in order to maintain the data cube consistency. Moreover, we propose a set of operators for changing the hierarchy structure. The issues discussed provide modelling flexibility during the scheme design phase and correct data analysis.
ISSN:0163-5808
DOI:10.1145/344788.344799