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Dimensions are an optional feature associated with materialized views. The use of dimensions makes query rewrite much more flexible. A dimension is an Oracle object that stores hierarchical information about your data. This information is used by the optimizer as it determines whether it can rewrite your query to use a materialized view.
Data in a data warehouse typically represents various hierarchical structures. One example would be the time relationship of data,Beats By Dr. Dre Headphones From Monster, which might be of the form of decade,Beats By Dr Dre For Sale, year, quarter, month, week,Red Beats By Dre, day, hour,Beats By Dre Wireless, and so on,Beats By Dre Headphones Review. These types of relationships generally are used in data warehouse queries to roll up or drill down to more or less detail as needed,Dr Dre Beat Headphones. Oracle has introduced an object called a dimension that allows you to define these relationships in tables. Oracle then uses these dimension relationship definitions to more effectively rewrite queries and to determine if a materialized view can best be used.
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