PowerCenter
- PowerCenter 10.5.7
- All Products
Term
| Definition
|
---|---|
Aggregate | Pre-stored summary of data or grouping of detailed data which satisfies a specific business rule. Example rules: sum, min, count, or combinations of them. |
Level | A specific property of a dimension. Examples: size, type, and color. |
Cube | A set of related factual measures, aggregates, and dimensions for a specific dimensional analysis problem. Example: regional product sales. |
Dimension | A set of level properties that describe a specific aspect of a business, used for analyzing the factual measures of one or more cubes which use that dimension. Examples: geography, time, customer, and product. |
Drilling | Drilling is the term used for navigating through a cube. This navigation is usually performed to access a summary level of information or to provide more detailed properties of a dimension in a hierarchy. |
Fact | A fact is a time variant measurement of quantitative data in a cube; for example, units sold, sales dollars, or total profit. |
Hierarchy | Hierarchy concept refers to the level of granularity represented by the data in a particular dimension of a cube. For example, state, county, district, and city represent different granularity in the hierarchy of the geography dimension. |
Measure | Means for representing quantitative data in facts or aggregates. Example measures are total sales or units sold per year. |
Normalization | A process used for reducing redundancies and removing anomalies in related dimension tables in various hierarchies. |
Redundancy | Term used for referring to duplication of data among related tables for the sake of improving the speed of query processing. |
Star Schema | A normalized multi-dimensional model in which each disjoint dimension is represented by a single table. |
Snow Flake Schema | A normalized multi-dimensional model in which at least one dimension is represented by two or more hierarchically related tables. |