Certified Data Management Professional – Fundamentals (CDMP) — Question 22

A project scope includes the collection, exchange and reporting of data from multiple systems. Conceptual, logical and physical data models are maintained. How many models of each type can be expected?

Answer options

• A. More logical data models than physical data models, and more logical data models than conceptual data models
• B. The same number of each of the model types
• C. More conceptual data models than logical data models, and more logical data models than physical data models
• D. Only 1 conceptual data model, 1 logical data model and 1 physical data model
• E. More physical data models than logical data models, and more logical data models than conceptual data models

Correct answer: E

Explanation

The correct answer is E because, in data modeling practices, it is common to have more physical data models than logical models, reflecting the implementation details of the data. Additionally, logical models typically outnumber conceptual models as they provide a more detailed view of the data structure while still abstracting from implementation specifics. The other options do not accurately represent the usual relationships between these types of models.