Table of Contents
Advances in Software Engineering
Volume 2012 (2012), Article ID 247592, 13 pages
Research Article

Metadata for Approximate Query Answering Systems

Dipartimento di Informatica, Università degli Studi di Bari Aldo Moro, Via Orabona 4, 70125 Bari, Italy

Received 30 January 2012; Revised 5 June 2012; Accepted 23 June 2012

Academic Editor: Gerardo Canfora

Copyright © 2012 Francesco Di Tria et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


In business intelligence systems, data warehouse metadata management and representation are getting more and more attention by vendors and designers. The standard language for the data warehouse metadata representation is the Common Warehouse Metamodel. However, business intelligence systems include also approximate query answering systems, since these software tools provide fast responses for decision making on the basis of approximate query processing. Currently, the standard meta-model does not allow to represent the metadata needed by approximate query answering systems. In this paper, we propose an extension of the standard metamodel, in order to define the metadata to be used in online approximate analytical processing. These metadata have been successfully adopted in ADAP, a web-based approximate query answering system that creates and uses statistical data profiles.