Why would a database be renormalized?

A. To ensure data integrity

B. To increase processing efficiency

C. To prevent duplication of data

D. To save storage space

A database is renormalized when there is a need to improve processing efficiency.

There is, however, a risk to data integrity when this occurs. Since it implies the introduction of duplication, it will not likely allow saving of storage space.

Source: Information Systems Audit and Control Association, Certified Information Systems Auditor 2002 review manual, Chapter 3: Technical Infrastructure and Operational Practices (page 109).