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Don Burleson Blog 







Data Warehousing Aggregation Composition

by Burleson Consulting

High Performance Data Warehousing

Problem Solving For The Oracle Warehouse  


Another common use for statistical analysis is the recomposition of data into new forms. As we know from the relational database model, data is stored in tables at the atomic level. That is, many composite objects must be constructed from their pieces (see Figure 1.19).

Figure 1.19 Composition of new database objects.

In Figure 1.19, you can see that the data warehouse user desires to model an aggregate object so that the behavior of the artificial aggregate can be compared with the behavior of other aggregate objects. In other words, the data warehouse manager may wish to analyze the nature of tuition bills, class schedules, and report cards, even though these entities are composed, or created, from different components in the OLTP database. This type of aggregation is often achieved through massive de-normalization of the data structures when the data warehouse is designed.

This is an excerpt from "High Performance Data Warehousing", copyright 1997.
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