限定搜索步长的分段平滑直方图
首发时间:2006-08-01
摘要:本文在作者曾提出的限定直方数的分段平滑直方图的基础上,又提出了一种新的限定搜索步长的分段平滑直方图方法,用于估算查询结果大小。关于两种分段平滑直方图方法,进行了大量的模拟实验。实验结果表明,限定搜索步长的分段平滑直方图计算灵活,实现效率高,有较好的实用价值
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Study on Subsection Smooth Histogram with Research Step Limited
Abstract:In this paper, a new subsection smooth histogram with research step limited, based on the subsection smooth histogram, for the size estimation of query result is presented. According to the result of simulation examination, the subsection smooth histogram with research step limited is more advantage with flexible arithmetic, higher efficiency and higher application value.
Keywords: Database, query optimization, estimation of query cost, histogram
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