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A METHOD FOR MULTI-DIMENSIONAL HISTOGRAMS USING A MINIMAL SKEW COVER IN A SPACE PARTITIONING TREE AND RECORDING MEDIUM STORING PROGRAM FOR EXECUTING THE SAME
A METHOD FOR MULTI-DIMENSIONAL HISTOGRAMS USING A MINIMAL SKEW COVER IN A SPACE PARTITIONING TREE AND RECORDING MEDIUM STORING PROGRAM FOR EXECUTING THE SAME
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机译:一种在空间划分树中使用最小偏移覆盖并记录用于执行相同操作的存储程序的多维直方图的方法
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摘要
The present disclosure relates to a multi-dimensional histogram method using a minimal data-skew cover in a space-partitioning tree, which is used to estimate the selectivity of queries, that is, the sizes of query results, and a recording medium storing a program for executing the multi-dimensional histogram method. In the multi-dimensional histogram method, a Database (DB) system receives information required to generate a histogram from an outside of the DB system, and then constructs a space-partitioning tree based on the information required to generate a histogram. The DB system constructs a multi-dimensional histogram based on a minimal data-skew cover in the space-partitioning tree. When the DB system receives a query from the outside, the DB system calculates the estimate of the selectivity for the query by using the multi-dimensional histogram. Further, the present disclosure includes a recording medium storing a program for executing the multi-dimensional histogram method.
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