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The goal of a threshold query is to detect all objects whose score exceeds a given threshold. This type of query is used in many settings, such as data mining, event triggering, and top-k selection. Often, threshold queries are performed over distributed data. Given database relations that are distributed over many nodes, an object's score is computed by aggregating the value of each attribute, applying a given scoring function over the aggregation, and thresholding the function's value. However, joining all the distributed relations to a central database might incur prohibitive overheads in bandwidth, CPU, and storage accesses.
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