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On Estimating Result Sizes of Multi-way Spatial Joins

机译:关于多向空间连接的结果大小的估计

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摘要

In a real life environment, spatial data is highly skewed. In general, there are two kinds of skews in spatial data. One is the placement skew and the other is the area skew. This paper introduces methods and the characteristics of estimating the accurate result sizes of the multi-way join for the area skewed spatial data. Especially, this paper describes the number and sort of the statistics which the optimizer should keep in order to calculate the multi-way join result size. Experimental results show our approach generally provides accurate estimation for the multi-way join for the area skewed spatial data.
机译:在现实生活中,空间数据高度偏斜。通常,空间数据中有两种偏斜。一个是放置偏斜,另一个是面积偏斜。本文介绍了估计区域偏斜空间数据的多向联接的精确结果大小的方法和特征。特别是,本文描述了优化器为了计算多方联接结果大小而应保留的统计信息的数量和种类。实验结果表明,我们的方法通常可为区域偏斜空间数据的多路联接提供准确的估计。

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