WGU D426 Full Module Verified Multiple
Choice and Conceptual Actual Frequently
Tested Exam Questions With Reviewed 100%
Correct Detailed Answers
Guaranteed Pass!!Current Update!!
1. Database Fundamentals & Roles
• Definition and purpose of database applications
• Key roles: Database Administrator, Designer, Programmer, and User
• Concepts of authorization, transaction management, and data integrity
2. System Components & Architecture
• Query Processor: query interpretation, optimization, plan creation
• Storage Manager: translating instructions to file system operations
• Transaction Manager: ensuring reliable, atomic operations and consistency
3. Database Design Phases
• Conceptual (Analysis): identifying entities, attributes, relationships
• Logical Design: translating models into tables, keys, columns
• Physical Design: storage structures, indexing, performance tuning
• Principle of Data Independence (physical design doesn’t alter query results)
4. Core Elements: Tables, Rows & Columns
• Tables (relations), columns (fields), and rows (tuples)
• Synonymous terms: Table ≈ File/Relation; Row ≈ Record/Tuple; Column ≈ Field/Attribute
5. Data Processing Languages (SQL Sublanguages)
, • DDL – Data Definition Language (e.g., CREATE, DROP, ALTER)
• DML – Data Manipulation Language (e.g., INSERT, UPDATE, DELETE)
• DQL – Data Query Language (SELECT statements)
• DCL – Data Control Language (permissions management)
• DTL – Data Transaction Language (transactions & rollbacks)
6. SQL Syntax & Operations
• Data types: INT, DECIMAL, VARCHAR, DATE
• Commands: CREATE TABLE, DROP TABLE, ALTER TABLE (ADD/CHANGE/DROP column)
• Operators: BETWEEN, LIKE, DISTINCT, ORDER BY, arithmetic and comparison operators
• Aggregate Functions: COUNT, SUM, AVG, MIN, MAX
7. Queries & Joins
• JOIN Types: INNER, LEFT, RIGHT, FULL, OUTER, SELF, CROSS, Equi-join, Non-equi join
• Subqueries: nested queries, correlated vs. non-correlated
• Set Operations: UNION, INTERSECT, EXCEPT (implicit in some material)
8. Entity-Relationship (ER) Modeling
• Concepts: Entities, Attributes, Relationships, Instances, Types
• ER Diagrams: notation including Crow’s Foot, cardinality constraints, supertype/subtype,
partitions
9. Keys & Data Integrity
• Keys: Primary Key, Composite, Artificial keys, Candidate keys
• Dependencies: Functional dependency, trivial vs. non-trivial
• Enforcing Referential Integrity via key constraints
10. Normalization
• Normal forms: 1NF, 2NF, 3NF, and Boyce-Codd Normal Form (BCNF)
, • Purpose: eliminating redundancy and promoting logical consistency
11. Indexing & Performance
• Index types: Dense vs. Sparse, Hash, Bitmap, Multi-level indexes
• Table types: Heap, Sorted, Hash, Clusters, Tablespaces
• Concepts: Table scans vs. Index scans, Hit ratio (selectivity), Binary search, Query performance
12. Emerging Technologies
• Brief exposure to NoSQL systems (e.g., MongoDB, open-source, big data contexts)
Database Fundamentals & Purpose
Q1. What is the primary purpose of a database application?
A. To replace programming languages
B. To store, retrieve, and manage data efficiently
C. To act as a file explorer for users
D. To remove the need for a database administrator
Answer: B
Q2. Which of the following best describes a database?
A. A collection of unrelated data
B. A self-describing collection of integrated records
C. A folder of files on a hard drive
D. An application interface
Answer: B
Q3. A database application is primarily designed to:
A. Store only unstructured data
B. Enforce data integrity and facilitate user interaction with data
C. Replace spreadsheets entirely
, D. Prevent data from being modified
Answer: B
Q4. Which of the following is an advantage of using a database system over a flat
file system?
A. Increased redundancy
B. Data independence and reduced inconsistency
C. Lack of constraints
D. Easier manual file handling
Answer: B
Q5. Metadata in a database refers to:
A. The actual user data stored in tables
B. Data about the structure of data (e.g., column names, types)
C. System errors generated by queries
D. Backup copies of databases
Answer: B
Q6. Who is primarily responsible for the installation, configuration, security, and
maintenance of databases?
A. Database Programmer
B. Database Designer
C. Database Administrator (DBA)
D. Database User
Answer: C
Q7. Which role focuses on creating the conceptual and logical design of the
database?
A. Programmer
B. Designer
C. DBA
D. End user
Answer: B
Choice and Conceptual Actual Frequently
Tested Exam Questions With Reviewed 100%
Correct Detailed Answers
Guaranteed Pass!!Current Update!!
1. Database Fundamentals & Roles
• Definition and purpose of database applications
• Key roles: Database Administrator, Designer, Programmer, and User
• Concepts of authorization, transaction management, and data integrity
2. System Components & Architecture
• Query Processor: query interpretation, optimization, plan creation
• Storage Manager: translating instructions to file system operations
• Transaction Manager: ensuring reliable, atomic operations and consistency
3. Database Design Phases
• Conceptual (Analysis): identifying entities, attributes, relationships
• Logical Design: translating models into tables, keys, columns
• Physical Design: storage structures, indexing, performance tuning
• Principle of Data Independence (physical design doesn’t alter query results)
4. Core Elements: Tables, Rows & Columns
• Tables (relations), columns (fields), and rows (tuples)
• Synonymous terms: Table ≈ File/Relation; Row ≈ Record/Tuple; Column ≈ Field/Attribute
5. Data Processing Languages (SQL Sublanguages)
, • DDL – Data Definition Language (e.g., CREATE, DROP, ALTER)
• DML – Data Manipulation Language (e.g., INSERT, UPDATE, DELETE)
• DQL – Data Query Language (SELECT statements)
• DCL – Data Control Language (permissions management)
• DTL – Data Transaction Language (transactions & rollbacks)
6. SQL Syntax & Operations
• Data types: INT, DECIMAL, VARCHAR, DATE
• Commands: CREATE TABLE, DROP TABLE, ALTER TABLE (ADD/CHANGE/DROP column)
• Operators: BETWEEN, LIKE, DISTINCT, ORDER BY, arithmetic and comparison operators
• Aggregate Functions: COUNT, SUM, AVG, MIN, MAX
7. Queries & Joins
• JOIN Types: INNER, LEFT, RIGHT, FULL, OUTER, SELF, CROSS, Equi-join, Non-equi join
• Subqueries: nested queries, correlated vs. non-correlated
• Set Operations: UNION, INTERSECT, EXCEPT (implicit in some material)
8. Entity-Relationship (ER) Modeling
• Concepts: Entities, Attributes, Relationships, Instances, Types
• ER Diagrams: notation including Crow’s Foot, cardinality constraints, supertype/subtype,
partitions
9. Keys & Data Integrity
• Keys: Primary Key, Composite, Artificial keys, Candidate keys
• Dependencies: Functional dependency, trivial vs. non-trivial
• Enforcing Referential Integrity via key constraints
10. Normalization
• Normal forms: 1NF, 2NF, 3NF, and Boyce-Codd Normal Form (BCNF)
, • Purpose: eliminating redundancy and promoting logical consistency
11. Indexing & Performance
• Index types: Dense vs. Sparse, Hash, Bitmap, Multi-level indexes
• Table types: Heap, Sorted, Hash, Clusters, Tablespaces
• Concepts: Table scans vs. Index scans, Hit ratio (selectivity), Binary search, Query performance
12. Emerging Technologies
• Brief exposure to NoSQL systems (e.g., MongoDB, open-source, big data contexts)
Database Fundamentals & Purpose
Q1. What is the primary purpose of a database application?
A. To replace programming languages
B. To store, retrieve, and manage data efficiently
C. To act as a file explorer for users
D. To remove the need for a database administrator
Answer: B
Q2. Which of the following best describes a database?
A. A collection of unrelated data
B. A self-describing collection of integrated records
C. A folder of files on a hard drive
D. An application interface
Answer: B
Q3. A database application is primarily designed to:
A. Store only unstructured data
B. Enforce data integrity and facilitate user interaction with data
C. Replace spreadsheets entirely
, D. Prevent data from being modified
Answer: B
Q4. Which of the following is an advantage of using a database system over a flat
file system?
A. Increased redundancy
B. Data independence and reduced inconsistency
C. Lack of constraints
D. Easier manual file handling
Answer: B
Q5. Metadata in a database refers to:
A. The actual user data stored in tables
B. Data about the structure of data (e.g., column names, types)
C. System errors generated by queries
D. Backup copies of databases
Answer: B
Q6. Who is primarily responsible for the installation, configuration, security, and
maintenance of databases?
A. Database Programmer
B. Database Designer
C. Database Administrator (DBA)
D. Database User
Answer: C
Q7. Which role focuses on creating the conceptual and logical design of the
database?
A. Programmer
B. Designer
C. DBA
D. End user
Answer: B
