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什么是OLAP         ★★★★

什么是OLAP

作者:闵涛 文章来源:闵涛的学习笔记 点击数:2178 更新时间:2009/4/22 23:21:20
the data or members of a dimension in order to restrict the set of data retrieved. Examples of selections include the top ten salespersons by revenue, data from the east region only and all products with margins greater than 20 percent.
Synonyms: Condition, Screen, Filter

SLICE

A slice is a subset of a multi-dimensional array corresponding to a single value for one or more members of the dimensions not in the subset. For example, if the member Actuals is selected from the Scenario dimension, then the sub-cube of all the remaining dimensions is the slice that is specified. The data omitted from this slice would be any data associated with the non-selected members of the Scenario dimension, for example Budget, Variance, Forecast, etc. From an end user perspective, the term slice most often refers to a two- dimensional page selected from the cube.

SLICE AND DICE

The user-initiated process of navigating by calling for page displays interactively, through the specification of slices via rotations and drill down/up.

SPARSE

A multi-dimensional data set is sparse if a relatively high percentage of the possible combinations (intersections) of the members from the data set's dimensions contain missing data. The total possible number of intersections can be computed by multiplying together the number of members in each dimension. Data sets containing one percent, .01 percent, or even smaller percentages of the possible data exist and are quite common.
See: Dense

VERTICAL DIMENSION  

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