WGU D635 OBJECTIVE ASSESSMENT PRACTICE
EXAM - (60 QUESTIONS) UP-TO-DATE ACTUAL
EXAM QUESTIONS AND 100% ACCURATE
SOLUTIONS | VERIFIED ANSWERS - INSTANT PDF
DOWNLOAD
Examiner/Administrator: Western Governors University (WGU)
Candidate Name: ____________________________
Candidate ID: _______________________________
Date: ______________________________________
Examination Center/Location: ________________
Time Allowed: 120 Minutes
Total Questions: 60
Instructions:
Read each question carefully and select the most appropriate answer. Each
question carries equal marks. No external materials are permitted. Manage
your time effectively to ensure all questions are attempted. This assessment
evaluates applied knowledge and analytical thinking aligned with
competency-based learning objectives.
Core Competency Areas:
• Data Management and Governance
• Database Design and Normalization
• Query Optimization and SQL
• Data Security and Compliance
• Data Warehousing and Analytics
• Data Quality and Integrity
This assessment is designed to evaluate a candidate’s ability to apply data
management principles, database systems knowledge, and analytical
reasoning in real-world scenarios. Candidates will demonstrate competency in
relational database concepts, data governance frameworks, and structured
, query logic. The exam reflects modern industry practices and emphasizes
problem-solving within enterprise data environments.
Disclaimer: This is a simulated practice exam created for educational purposes.
It is not affiliated with or an exact replica of any official WGU examination.
Q1. A database administrator is tasked with improving query performance for a
table containing millions of records. The table frequently filters on a non-
primary key column. Which strategy would MOST effectively improve
performance?
A. Add a clustered index on the primary key
B. Add a non-clustered index on the frequently filtered column
C. Normalize the table to 3NF
D. Increase database storage capacity
Correct Answer: B. Add a non-clustered index on the frequently filtered
column
Explanation: A non-clustered index on frequently queried columns
significantly improves lookup speed. Option A is already assumed; clustering
doesn’t help non-key filters. Option C improves structure but not direct query
speed. Option D does not affect query execution efficiency.
Q2. A company wants to ensure that no duplicate customer records exist in their
database. Which constraint is MOST appropriate?
A. Foreign Key
B. Check Constraint
,C. Unique Constraint
D. Default Constraint
Correct Answer: C. Unique Constraint
Explanation: A unique constraint enforces uniqueness across specified
columns. Foreign keys ensure referential integrity, not uniqueness. Check
constraints validate conditions, and default constraints assign values.
Q3. During normalization, a table is split to eliminate transitive dependencies.
Which normal form is being applied?
A. 1NF
B. 2NF
C. 3NF
D. BCNF
Correct Answer: C. 3NF
Explanation: Third Normal Form removes transitive dependencies. 1NF
ensures atomic values, 2NF removes partial dependencies, and BCNF is stricter
than 3NF.
Q4. A data analyst needs to retrieve only unique values from a column. Which
SQL keyword is MOST appropriate?
A. UNIQUE
B. DISTINCT
C. GROUP BY
D. FILTER
, Correct Answer: B. DISTINCT
Explanation: DISTINCT returns unique values. UNIQUE defines
constraints, GROUP BY aggregates, and FILTER is not standard SQL syntax.
Q5. Which data governance principle ensures that data is accurate and reliable
throughout its lifecycle?
A. Availability
B. Integrity
C. Confidentiality
D. Redundancy
Correct Answer: B. Integrity
Explanation: Data integrity ensures accuracy and consistency. Availability
ensures access, confidentiality protects privacy, and redundancy involves
duplication.
Q6. A company implements role-based access control (RBAC). What is the
primary benefit?
A. Faster database queries
B. Improved data compression
C. Simplified user permission management
D. Increased storage efficiency
Correct Answer: C. Simplified user permission management
Explanation: RBAC assigns permissions based on roles, simplifying
administration. It does not directly impact performance or storage.
EXAM - (60 QUESTIONS) UP-TO-DATE ACTUAL
EXAM QUESTIONS AND 100% ACCURATE
SOLUTIONS | VERIFIED ANSWERS - INSTANT PDF
DOWNLOAD
Examiner/Administrator: Western Governors University (WGU)
Candidate Name: ____________________________
Candidate ID: _______________________________
Date: ______________________________________
Examination Center/Location: ________________
Time Allowed: 120 Minutes
Total Questions: 60
Instructions:
Read each question carefully and select the most appropriate answer. Each
question carries equal marks. No external materials are permitted. Manage
your time effectively to ensure all questions are attempted. This assessment
evaluates applied knowledge and analytical thinking aligned with
competency-based learning objectives.
Core Competency Areas:
• Data Management and Governance
• Database Design and Normalization
• Query Optimization and SQL
• Data Security and Compliance
• Data Warehousing and Analytics
• Data Quality and Integrity
This assessment is designed to evaluate a candidate’s ability to apply data
management principles, database systems knowledge, and analytical
reasoning in real-world scenarios. Candidates will demonstrate competency in
relational database concepts, data governance frameworks, and structured
, query logic. The exam reflects modern industry practices and emphasizes
problem-solving within enterprise data environments.
Disclaimer: This is a simulated practice exam created for educational purposes.
It is not affiliated with or an exact replica of any official WGU examination.
Q1. A database administrator is tasked with improving query performance for a
table containing millions of records. The table frequently filters on a non-
primary key column. Which strategy would MOST effectively improve
performance?
A. Add a clustered index on the primary key
B. Add a non-clustered index on the frequently filtered column
C. Normalize the table to 3NF
D. Increase database storage capacity
Correct Answer: B. Add a non-clustered index on the frequently filtered
column
Explanation: A non-clustered index on frequently queried columns
significantly improves lookup speed. Option A is already assumed; clustering
doesn’t help non-key filters. Option C improves structure but not direct query
speed. Option D does not affect query execution efficiency.
Q2. A company wants to ensure that no duplicate customer records exist in their
database. Which constraint is MOST appropriate?
A. Foreign Key
B. Check Constraint
,C. Unique Constraint
D. Default Constraint
Correct Answer: C. Unique Constraint
Explanation: A unique constraint enforces uniqueness across specified
columns. Foreign keys ensure referential integrity, not uniqueness. Check
constraints validate conditions, and default constraints assign values.
Q3. During normalization, a table is split to eliminate transitive dependencies.
Which normal form is being applied?
A. 1NF
B. 2NF
C. 3NF
D. BCNF
Correct Answer: C. 3NF
Explanation: Third Normal Form removes transitive dependencies. 1NF
ensures atomic values, 2NF removes partial dependencies, and BCNF is stricter
than 3NF.
Q4. A data analyst needs to retrieve only unique values from a column. Which
SQL keyword is MOST appropriate?
A. UNIQUE
B. DISTINCT
C. GROUP BY
D. FILTER
, Correct Answer: B. DISTINCT
Explanation: DISTINCT returns unique values. UNIQUE defines
constraints, GROUP BY aggregates, and FILTER is not standard SQL syntax.
Q5. Which data governance principle ensures that data is accurate and reliable
throughout its lifecycle?
A. Availability
B. Integrity
C. Confidentiality
D. Redundancy
Correct Answer: B. Integrity
Explanation: Data integrity ensures accuracy and consistency. Availability
ensures access, confidentiality protects privacy, and redundancy involves
duplication.
Q6. A company implements role-based access control (RBAC). What is the
primary benefit?
A. Faster database queries
B. Improved data compression
C. Simplified user permission management
D. Increased storage efficiency
Correct Answer: C. Simplified user permission management
Explanation: RBAC assigns permissions based on roles, simplifying
administration. It does not directly impact performance or storage.
