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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The simulation is categorized as a sampling method because the inputs are randomly generated from a probability distribution that stands in for a real data population.

模拟是按照采样方法分类的，因为输入是根据代表真实数据总体的概率分布而随机生成的。

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For read-only data, replication and distribution are also possible (as is done using content delivery networks).

对于只读数据，也可以进行复制和分布(使用内容传递网络完成)。

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Tax return data is unsuited for measuring income distribution for other reasons as well.

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For them the technology has the potential to provide valuable data about the demand for their medicine in order to plan their distribution more efficiently and precisely.

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Clearly, eBay has high-functioning systems in place for data collection, real-time analysis, targeted distribution, automated response, etc.

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