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Mediators for web-based data integration need the ability to handle multiple, often conflicting objectives, including cost, coverage and execution flexibility. This requires the development of query planning algorithms that are capable of multi-objective query optimization, as well as techniques for automatically gathering the requisite cost/coverage(More)
Recent work in data integration has shown the importance of statistical information about the coverage and overlap of sources for efficient query processing. Despite this recognition there are no effective approaches for learning the needed statistics. The key challenge in learning such statistics is keeping the number of needed statistics low enough to(More)
Recent work in data integration has shown the importance of statistical information about the coverage and overlap of sources for efficient query processing. Despite this recognition there are no effective approaches for learning the needed statistics. The key challenge in learning such statistics is keeping the number of needed statistics low enough to(More)
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