Title: Querying a multi-version trajectory data warehouse

Authors: Wided Oueslati; Jalel Akaichi

Addresses: Higher Institute of Management of Tunis, 41, Rue de la Liberté, Cité Bouchoucha 2000 Le Bardo, Tunis, Tunisia ' Higher Institute of Management of Tunis, 41, Rue de la Liberté, Cité Bouchoucha 2000 Le Bardo, Tunis, Tunisia

Abstract: Trajectory data warehouses, which gather data about mobile objects' activities may be autonomous and consequently may change frequently their structures and contents. This kind of change can alter the trajectory data warehouse associated schema, the analysis process and thus the decision making requirements on which the initial conceptual model is performed. For this reason, a TDW maintenance technique is needed to adapt the defined schema. In this paper, we will focus on maintaining a trajectory data warehouse after schema changes using for that the versioning approach which allows the existence of many versions of a same trajectory data warehouse. However, querying such data warehouse versions is considered as a big challenge since data returned by queries may vary according to queried versions. Hence, a solution to ensure data mapping between different versions is required in order to give valid results necessary for providing elements leading to efficient decisions.

Keywords: trajectory data warehousing; TDW modelling; TDW maintenance; multi-version trajectory data warehouses; querying; schema changes; versioning approach; data mapping; queries.

DOI: 10.1504/IJBIS.2016.075252

International Journal of Business Information Systems, 2016 Vol.21 No.4, pp.403 - 417

Received: 18 Aug 2014
Accepted: 11 Oct 2014
Published online: 09 Mar 2016 *

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