We discovered that there is a point where aggregate index costs—more-expensive INSERT and DELETE operations, for example—outweigh a new index's query speed-up benefit.

我发现有一个聚合索引成本的点 — 例如，更为昂贵的 INSERT 和 DELETE 操作 — 超出一个新索引的查询加速所能带来的效益。

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This paper introduces a solution solving the problem of low response speed of aggregate operations in statistical database (SDB_s).

本文主要论述利用专家系统技术解决统计数据库中聚集操作响应速度慢和瓶颈问题。

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The aggregate index that appears the variation magnitude and variation speed and the variation nature is proposed to describe quantitatively the variation nature and complexity of heterogeneity.

提出了评价储层非均质性的综合评价指标，对储层非均质性的变化幅度、变化速度以及变化的随机性进行定量描述。

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