Affiliations: Institut de Recherche en Informatique de Toulouse
IRIT, Université Paul Sabatier, Toulouse, France
Note: [] Corresponding author: Abdelkader Hameurlain, Institut de
Recherche en Informatique de Toulouse IRIT, Université Paul Sabatier, 118
Route de Narbonne, 31062 Toulouse Codex 9, France. Tel.: +33 5 61 55 82 48:
Fax: +33 5 61 55 62 58; E-mail: {morvan, hameur}@irit.fr
Abstract: Most of the dynamic query optimization methods proposed in the
literature are centralized. This centralization, in a large-scale environment,
generates a bottleneck due to relatively important message exchange on a
network with a weak bandwidth and strong latency. It becomes thus convenient to
render autonomous and self-adaptable the query execution on a large-scale
network. In this perspective, we propose a mobile relational algebra to
decentralize the control of dynamic query optimization processes. Experiments,
in local and large-scale distributed environments, allow: (i) to validate the
proposed proactive migration policy, and (ii) to identify the efficiency
intervals of proposed mobile relational algebra.
Keywords: Large scale data distribution, dynamic query optimization, decentralization, mobile agents, performance evaluation
