Query Processing and Optimisation in Integrated Heterogeneous Grid Resources (original) (raw)

The performance of Grid computing technologies for distributed data access and query processing has been investigated in a number of studies. However, difierent Grid data sources may have schema con∞icts which re- quire flne-grained resolution through the use of data integration technolo- gies that are not supported by the current generation of Grid data access and querying middleware. This is particularly the case with distributed querying and analysis of complex data sources as found in Life Sciences applications. The query performance of architectures that combine Grid data access and query processing capabilities with data integration tech- nologies has not been investigated to date. In this paper, we investigate architectural, optimisation and perfor- mance issues arising from the coupling of Grid data access and distributed querying together with data integration technologies. Speciflcally, we in- vestigate these issues for the OGSA-DAI and OGSA-DQP open-source Grid access and...

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