Monday Apr 29, 2013

【CBO Optimizer优化器】IX_SEL索引选择率

ix_sel – Index selectivity 索引选择率是Oracle中CBO 基于成本优化器重要的参考指标 ,反应了符合谓词条件 通过索引主导列访问表上数据行的比例。(ix_sel – Index selectivity. Fraction of the table rows accessed by the indexes leading column in order to meet the predicate supplied. (10053)。[Read More]
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