WGU D426 OBJECTIVE ASSESSMENT FINAL EXAM (2025/2026)
Actual Exam | Western Governors University | Data Management Applications
Overview
This 2025/2026 validated resource contains the complete WGU D426 Objective Assessment
Final Exam with actual questions and verified answers, directly aligned with current Western
Governors University curriculum standards. Essential for students preparing for
comprehensive program assessment and demonstrating mastery in data management,
database applications, and information systems.
Key Features
✓ 80-Question Comprehensive Exam matching WGU OA format
✓ Database Management Principles with SQL applications
✓ Data Modeling & Design with implementation strategies
✓ Updated 2025/2026 WGU competency standards
✓ Information Systems Integration with business applications
Content Domains
• Database Fundamentals & Architecture (18 Questions)
• SQL Programming & Queries (17 Questions)
• Data Modeling & Normalization (16 Questions)
• Database Administration & Security (14 Questions)
• Business Intelligence Applications (10 Questions)
• Data Warehousing Concepts (5 Questions)
Answer Format
Verified correct answers in bold green with:
• Database concept explanations
• SQL query justifications
• Design methodology rationales
• Security protocol applications
Critical Updates 2025/2026
NEW - Cloud database integration protocols
UPDATED - Data privacy regulation compliance
REVISED - Big data management frameworks
MODIFIED - Database optimization techniques
DATABASE FUNDAMENTALS & ARCHITECTURE (Questions 1–18)
1. A relational database organizes data into:
a) Hierarchical trees
b) Two-dimensional tables with rows (records) and columns (attributes)
c) Network graphs
d) Unstructured blobs
, b) Two-dimensional tables with rows (records) and columns (attributes)
Rationale: Relational model uses tables; each row is unique record, columns define
data types.
2. Which SQL statement is used to remove a table definition and all its data?
a) DELETE
b) TRUNCATE
c) DROP TABLE
d) ALTER
c) DROP TABLE
Rationale: DELETE removes rows; TRUNCATE removes all rows but keeps structure;
DROP removes object.
3. A primary key must be:
a) NULLable
b) Unique and NOT NULL (enforces entity integrity)
c) Duplicate-friendly
d) Optional
b) Unique and NOT NULL (enforces entity integrity)
Rationale: Guarantees uniqueness of each record; composite keys allowed.
4. Which normal form eliminates transitive dependencies?
a) 1NF
b) 2NF
c) 3NF (Third Normal Form)
d) BCNF
c) 3NF (Third Normal Form)
Rationale: 1NF removes repeating groups; 2NF removes partial dependencies; 3NF
removes transitive.
5. A foreign key constraint ensures:
a) Speed
b) Referential integrity between parent and child tables
c) Encryption
d) Redundancy
b) Referential integrity between parent and child tables
Rationale: Prevents orphan records; enforces valid references to primary key in
related table.
6. Which database model uses documents (JSON/BSON)?
a) Relational
b) NoSQL (document store like MongoDB)
c) Hierarchical
d) Network
b) NoSQL (document store like MongoDB)
Rationale: Schema-flexible; suitable for semi-structured data; scales horizontally.
7. ACID properties include:
a) Advanced, Consistent, Independent, Durable
b) Atomicity, Consistency, Isolation, Durability
c) Agile, Complete, Integrated, Dependable
d) Anonymous, Controlled, Isolated, Distributed
b) Atomicity, Consistency, Isolation, Durability
Rationale: Guarantees reliable transactions even in system failures.
Actual Exam | Western Governors University | Data Management Applications
Overview
This 2025/2026 validated resource contains the complete WGU D426 Objective Assessment
Final Exam with actual questions and verified answers, directly aligned with current Western
Governors University curriculum standards. Essential for students preparing for
comprehensive program assessment and demonstrating mastery in data management,
database applications, and information systems.
Key Features
✓ 80-Question Comprehensive Exam matching WGU OA format
✓ Database Management Principles with SQL applications
✓ Data Modeling & Design with implementation strategies
✓ Updated 2025/2026 WGU competency standards
✓ Information Systems Integration with business applications
Content Domains
• Database Fundamentals & Architecture (18 Questions)
• SQL Programming & Queries (17 Questions)
• Data Modeling & Normalization (16 Questions)
• Database Administration & Security (14 Questions)
• Business Intelligence Applications (10 Questions)
• Data Warehousing Concepts (5 Questions)
Answer Format
Verified correct answers in bold green with:
• Database concept explanations
• SQL query justifications
• Design methodology rationales
• Security protocol applications
Critical Updates 2025/2026
NEW - Cloud database integration protocols
UPDATED - Data privacy regulation compliance
REVISED - Big data management frameworks
MODIFIED - Database optimization techniques
DATABASE FUNDAMENTALS & ARCHITECTURE (Questions 1–18)
1. A relational database organizes data into:
a) Hierarchical trees
b) Two-dimensional tables with rows (records) and columns (attributes)
c) Network graphs
d) Unstructured blobs
, b) Two-dimensional tables with rows (records) and columns (attributes)
Rationale: Relational model uses tables; each row is unique record, columns define
data types.
2. Which SQL statement is used to remove a table definition and all its data?
a) DELETE
b) TRUNCATE
c) DROP TABLE
d) ALTER
c) DROP TABLE
Rationale: DELETE removes rows; TRUNCATE removes all rows but keeps structure;
DROP removes object.
3. A primary key must be:
a) NULLable
b) Unique and NOT NULL (enforces entity integrity)
c) Duplicate-friendly
d) Optional
b) Unique and NOT NULL (enforces entity integrity)
Rationale: Guarantees uniqueness of each record; composite keys allowed.
4. Which normal form eliminates transitive dependencies?
a) 1NF
b) 2NF
c) 3NF (Third Normal Form)
d) BCNF
c) 3NF (Third Normal Form)
Rationale: 1NF removes repeating groups; 2NF removes partial dependencies; 3NF
removes transitive.
5. A foreign key constraint ensures:
a) Speed
b) Referential integrity between parent and child tables
c) Encryption
d) Redundancy
b) Referential integrity between parent and child tables
Rationale: Prevents orphan records; enforces valid references to primary key in
related table.
6. Which database model uses documents (JSON/BSON)?
a) Relational
b) NoSQL (document store like MongoDB)
c) Hierarchical
d) Network
b) NoSQL (document store like MongoDB)
Rationale: Schema-flexible; suitable for semi-structured data; scales horizontally.
7. ACID properties include:
a) Advanced, Consistent, Independent, Durable
b) Atomicity, Consistency, Isolation, Durability
c) Agile, Complete, Integrated, Dependable
d) Anonymous, Controlled, Isolated, Distributed
b) Atomicity, Consistency, Isolation, Durability
Rationale: Guarantees reliable transactions even in system failures.
