提出了一种新的用于估算查询结果大小的直方图方法。
In this paper, a new histogram method for the size estimation of query result is presented.
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。
Histogram is the common method for size estimation of query result in many commercial database systems.
当接收到的请求数量适中，而来自多个异类互补数据源的结果大小有限时，可最佳地利用数据联合的优势。
The advantage of data federation is best exploited when a modest number of requests are received against limited result sets sized from multiple consistent, complementary data sources.
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