WGU D426
DATA MANAGEMENT - FOUNDATIONS
75-Question Timed Mock OA
Original Mixed-Concept Practice •
Answers • Detailed Rationales
90 Minutes • September 2026 •
2026/2027 Edition
Independent educational resource: This mock contains newly written questions and is not an official WGU assessment,
blueprint, recall, or question bank. “Mock OA” describes the independent practice format only. No passing result is
promised or guaranteed.
Catalog alignment: The September 2026 public catalog identifies D426 coverage in conceptual, logical and physical
data models; SQL-enabled database/table creation; and normalization. This mock extends those foundations through
common relational, query, integrity, transaction, and security applications.
,WGU D426 • 75-QUESTION TIMED MOCK OA-STYLE PRACTICE
Timed Mock Instructions
Setting Recommendation
Time limit 90 minutes
Questions 75 single-best-answer items
Average pace Approximately 72 seconds per question
Resources Use closed notes for the first attempt; follow your actual assessment rules separately.
Scoring One point per question; no penalty for guessing.
Review Mark uncertain items and return only after completing the full pass.
Pacing checkpoints
Checkpoint Target elapsed time Time remaining
Question 25 30 minutes 60 minutes
Question 50 60 minutes 30 minutes
Question 75 85 minutes 5 minutes for flagged items
Decision method
Read the business rule → identify the tested concept → eliminate category errors → apply the exact rule → verify
the requested outcome. For query questions, trace source rows, predicates, groups, NULL behavior, projection,
and ordering. For design questions, trace entities, keys, cardinality, dependencies, constraints, and anomalies.
Domain mix
Domain Count
Data Foundations 9
Modeling & Keys 18
Normalization 18
SQL & Constraints 12
Queries & Joins 9
Transactions & Operations 9
2026/2027 Edition | 2
, WGU D426 • 75-QUESTION TIMED MOCK OA-STYLE PRACTICE
Answer Sheet
1-15 16-30 31-45 46-60 61-75
1. ____ 16. ____ 31. ____ 46. ____ 61. ____
2. ____ 17. ____ 32. ____ 47. ____ 62. ____
3. ____ 18. ____ 33. ____ 48. ____ 63. ____
4. ____ 19. ____ 34. ____ 49. ____ 64. ____
5. ____ 20. ____ 35. ____ 50. ____ 65. ____
6. ____ 21. ____ 36. ____ 51. ____ 66. ____
7. ____ 22. ____ 37. ____ 52. ____ 67. ____
8. ____ 23. ____ 38. ____ 53. ____ 68. ____
9. ____ 24. ____ 39. ____ 54. ____ 69. ____
10. ____ 25. ____ 40. ____ 55. ____ 70. ____
11. ____ 26. ____ 41. ____ 56. ____ 71. ____
12. ____ 27. ____ 42. ____ 57. ____ 72. ____
13. ____ 28. ____ 43. ____ 58. ____ 73. ____
14. ____ 29. ____ 44. ____ 59. ____ 74. ____
15. ____ 30. ____ 45. ____ 60. ____ 75. ____
2026/2027 Edition | 3
DATA MANAGEMENT - FOUNDATIONS
75-Question Timed Mock OA
Original Mixed-Concept Practice •
Answers • Detailed Rationales
90 Minutes • September 2026 •
2026/2027 Edition
Independent educational resource: This mock contains newly written questions and is not an official WGU assessment,
blueprint, recall, or question bank. “Mock OA” describes the independent practice format only. No passing result is
promised or guaranteed.
Catalog alignment: The September 2026 public catalog identifies D426 coverage in conceptual, logical and physical
data models; SQL-enabled database/table creation; and normalization. This mock extends those foundations through
common relational, query, integrity, transaction, and security applications.
,WGU D426 • 75-QUESTION TIMED MOCK OA-STYLE PRACTICE
Timed Mock Instructions
Setting Recommendation
Time limit 90 minutes
Questions 75 single-best-answer items
Average pace Approximately 72 seconds per question
Resources Use closed notes for the first attempt; follow your actual assessment rules separately.
Scoring One point per question; no penalty for guessing.
Review Mark uncertain items and return only after completing the full pass.
Pacing checkpoints
Checkpoint Target elapsed time Time remaining
Question 25 30 minutes 60 minutes
Question 50 60 minutes 30 minutes
Question 75 85 minutes 5 minutes for flagged items
Decision method
Read the business rule → identify the tested concept → eliminate category errors → apply the exact rule → verify
the requested outcome. For query questions, trace source rows, predicates, groups, NULL behavior, projection,
and ordering. For design questions, trace entities, keys, cardinality, dependencies, constraints, and anomalies.
Domain mix
Domain Count
Data Foundations 9
Modeling & Keys 18
Normalization 18
SQL & Constraints 12
Queries & Joins 9
Transactions & Operations 9
2026/2027 Edition | 2
, WGU D426 • 75-QUESTION TIMED MOCK OA-STYLE PRACTICE
Answer Sheet
1-15 16-30 31-45 46-60 61-75
1. ____ 16. ____ 31. ____ 46. ____ 61. ____
2. ____ 17. ____ 32. ____ 47. ____ 62. ____
3. ____ 18. ____ 33. ____ 48. ____ 63. ____
4. ____ 19. ____ 34. ____ 49. ____ 64. ____
5. ____ 20. ____ 35. ____ 50. ____ 65. ____
6. ____ 21. ____ 36. ____ 51. ____ 66. ____
7. ____ 22. ____ 37. ____ 52. ____ 67. ____
8. ____ 23. ____ 38. ____ 53. ____ 68. ____
9. ____ 24. ____ 39. ____ 54. ____ 69. ____
10. ____ 25. ____ 40. ____ 55. ____ 70. ____
11. ____ 26. ____ 41. ____ 56. ____ 71. ____
12. ____ 27. ____ 42. ____ 57. ____ 72. ____
13. ____ 28. ____ 43. ____ 58. ____ 73. ____
14. ____ 29. ____ 44. ____ 59. ____ 74. ____
15. ____ 30. ____ 45. ____ 60. ____ 75. ____
2026/2027 Edition | 3
