首页>
外国专利>
Estimating the size of a join by generating and combining partial join estimates
Estimating the size of a join by generating and combining partial join estimates
展开▼
机译:通过生成和合并部分联接估计来估计联接的大小
展开▼
页面导航
摘要
著录项
相似文献
摘要
A program product, an apparatus, and a method of estimating a join size by generating partial join estimates and combining the partial join estimates. In particular, robust formulas are provided that may result in more consistent estimates and fewer inaccuracies. Inconsistencies and inaccuracies are generally present in conventional join size estimation techniques, however, consistent with the invention, consistent join size estimates may be generated resulting in improved access plan selection during optimization.
展开▼