A monitoring service for large-scale dynamic query optimisation in a grid environment Online publication date: Sat, 21-Jun-2008
by Mahmoud El Samad, Julien Gossa, Franck Morvan, Abdelkader Hameurlain, Jean-Marc Pierson, Lionel Brunie
International Journal of Web and Grid Services (IJWGS), Vol. 4, No. 2, 2008
Abstract: The execution plans generated by the traditional optimisers for large-scale distributed queries in a grid can be suboptimal for the following reasons: the centralisation of decisions made by the optimiser; the inaccuracy of estimations; the unavailability of up-to-date description of resources. In this paper, we propose an approach to improve the estimation of the execution cost of a query (or part of a query) in a grid environment by using Mobile Agents (MAs) and runtime monitoring information. First, Mas allow dynamic optimisation in a decentralised and autonomous way. Second, the retrieval of the monitoring information causes some issues addressed by a dedicated service called the Network Distance Service (NDS). The performance evaluation shows that our approach allows a better estimation of the execution cost of a query in a grid and a large benefit to monitor the CPU for a mobile join when the subestimation errors increase while the benefit to monitor the bandwidth is poor.
Online publication date: Sat, 21-Jun-2008
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