Depending on the complexity of the query and the size of the result set, the refresh operation may take a long time.

根据查询的复杂性和结果集的大小，刷新操作可能需要很长时间。

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And we discuss how to estimate the size of query result with Closed _ Euler Histogram.

讨论了如何使用闭欧拉直方图来估算查询结果集的大小。

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Histogram is the common method for size estimation of query result in many commercial database systems.

直方图是许多商用数据库系统中最常用的一种估算查询结果大小的方法。

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