Data in a Typical Data Warehouse May Be Denormalized to Improve

Multiple Choice

Data in a typical data warehouse may be denormalized to improve performance because ____.

A) the data does not have necessarily have to be absolutely current
B) data about each of the "subjects" in the data warehouse is typically collected from several of the company's transactional databases
C) data integrity problems are not a concern since the existing data is not updated
D) the data must be of high quality
E) the data may be aggregated