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Title: An efficient cost model for optimization of nearest neighbor search in low and medium dimensional spaces
Authors: Tao, Yufei
Zhang, Jun
Papadias, Dimitris
Mamoulis, Nikos
Keywords: Database
Spatial database
Nearest neighbor
Cost model
Issue Date: Oct-2004
Citation: IEEE transactions on knowledge and data engineering, v. 16, no. 10, October 2004, p. 1169-1184
Abstract: Existing models for nearest neighbor search in multi-dimensional spaces are not appropriate for query optimization because they either lead to erroneous estimation, or involve complex equations that are expensive to evaluate in real-time. This paper proposes an alternative method that captures the performance of nearest neighbor queries using approximation. For uniform data, our model involves closed formulae that are very efficient to compute and accurate for up to 10 dimensions. Further, the proposed equations can be applied on non-uniform data with the aid of histograms. We demonstrate the effectiveness of the model by using it to solve several optimization problems related to nearest neighbor search.
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