The optimizer ACTS based on statistical data about the number of rows in a table, the use of space by a table or index, and other information.

优化器的操作基于数据表中的行数、数据表或索引使用的空间以及其他信息的相关统计数据。

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Gaussian mixture model is firstly built as the statistical model for the intensity image, with an estimation of index number using MDL.

首先建立高斯混合的灰度统计模型，运用MDL准则自动确定类别的数目。

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