CDMP Ch 5 Exam Questions & Answers 2023/2024
Data Modeling Business Drivers - ANSWERS-Provide a common vocabulary around data.
-Capture and document explicit knowledge about an organizations data and systems
-Serve as a primary communications tool during projects
-Provide the starting poin...
Data Modeling Business Drivers - ANSWERS-Provide a common vocabulary around data.
-Capture and document explicit knowledge about an organizations data and systems
-Serve as a primary communications tool during projects
-Provide the starting point for customization, integration or even replacement of an application.
The goal of data modeling - ANSWERSConfirm and document understanding of different perspectives.
How can data modeling enhance the organization? - ANSWERSleads to lower support costs and increase
the reusability opportunities for future initiatives.
What does data modeling facilitate in the organization? - ANSWERS- Formalization
- Scope Definition
- Knowledge retention/documentation
Types of data that are modeled: - ANSWERS- Category Information
- Resource Information
- Business Event Information
- Detail Transaction Information
Data Model building blocks: - ANSWERS- Attributes
- Entities
- Relationships
- Domains
, What is Arity's in a relationship and what are common ones? - ANSWERSThe number of entities in a
relationship is an arity of the relationship.
Compound key - ANSWERSLike a credit card or a phone number (area code) + exchange + Local number
Super Key - ANSWERSIs any set of attributes that uniquely identify an entity instance.
Candidate keys - ANSWERSsimple key that is minimal, contains one or more attributes that identifies the
entity instance. Examples are email addresses, cell phone number and customer account number.
Primary Key - ANSWERSoften is a surrogate key and the alternate keys are business keys.
Independent Entity - ANSWERSPrimary key only contains attributes that belong to the specific entity.
Dependent entity - ANSWERSprimary key contains at least one attribute from another entity.
Domain - ANSWERSfields that are specific on the characteristics of its attributes.
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