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Invited Paper: How Can Mobile Agents and Cost Model Approaches Helpf for Distributed Query Optimization

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2 Author(s)
Hameurlain, A. ; Inst. de Recherche en Informatique de Toulouse, Univ. Paul Sabatier, Toulouse ; Morvan, F.

The management of voluminous, heterogeneous, and distributed data on a large-scale raises new problems and presents real challenges: efficiency of access, placement and redistribution of data, communication, confidentiality of access, availability of data, indexing, caching and replication mechanism, and benchmarking. In this paper, we point out the contributions of execution models based on mobile agents and cost model approaches to the large scale distributed query optimization. Firstly, we summarize state of the art of the main execution models based on mobile agents. We show how mobile agents can react dynamically to estimation errors, and resources unavailability. Then, to guarantee the autonomy of mobile agents, a part of cost model must be embedded. Finally, we study the efficiency of mobile agents in relation with the cost model approaches, the query type, and the adequacy of the cost model with regard to the data sources. Identification of intervals for mobility efficiency allows to define and validate a proactive migration policy

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Database and Expert Systems Applications, 2006. DEXA '06. 17th International Workshop on

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