selectivity 英 [sɪlek'tɪvɪtɪ;sel-;siːl-]   美 [sə,lɛk'tɪvəti]

selectivity

selectivity  英 [sɪlek'tɪvɪtɪ;sel-;siːl-] 美 [sə,lɛk'tɪvəti]

n. 选择性;分离性;选择度 

名词复数:selectivities 

At the same time, we also have found differences in signal selectivity that may allow us to target some bacteria while ignoring others. 同时,我们还发现了信号选择性的差异,这能够使我们针对一些特定的细菌而不影响到其他。
However, in the absence of data distribution information, the optimizer will calculate selectivity for filters of different types based on table indexes. 然而在缺乏数据分布信息的情况下,优化器将基于表索引计算不同类型筛选器的选择性。

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  • n. 选择性;分离性;选择度
  • 1. At the same time, we also have found differences in signal selectivity that may allow us to target some bacteria while ignoring others.

    同时,我们还发现了信号选择性的差异,这能够使我们针对一些特定的细菌而不影响到其他。

  • 2. However, in the absence of data distribution information, the optimizer will calculate selectivity for filters of different types based on table indexes.

    然而在缺乏数据分布信息的情况下,优化器将基于表索引计算不同类型筛选器的选择性。

  • 3. Sometimes, due to a skew in the distribution of data, the nature of the predicate or the query, or insufficient statistics, the optimizer's selectivity estimates may not be accurate.

    有时候,由于在数据分布上的一点偏差,加上谓词或查询的特性,或者由于统计信息不充分,可能导致优化器的选择性估计不准确。

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