WGU D426 OBJECTIVE ASSESSMENT 2026/2027 | COMPLETE EXAM PREP |
HIGH-YIELD PRACTICE QUESTIONS & VERIFIED ANSWERS |
COMPREHENSIVE STUDY GUIDE | LATEST UPDATE
1. If a company experiences a data breach due to inadequate user access
controls, what aspect of a database administrator's responsibilities may have
been neglected?
Designing the database schema
Optimizing SQL query performance
Enforcing procedures for user access
Creating database backups
2. Describe the role of logical design in the context of transforming data
models into a usable database structure.
Logical design defines the security protocols for data access.
Logical design translates the entity-relationship model into a
structured format of tables, columns, and keys.
Logical design focuses on the physical storage of data on disk.
Logical design creates user interfaces for database applications.
3. A database entity has attributes. An attribute can be described as
characteristics that describe the entity
a row of data
an ERD model
a data model
,4. Describe the significance of creating supertype and subtype entities in the
database design process.
Creating supertype and subtype entities is primarily for improving
SQL query performance.
Creating supertype and subtype entities is only relevant for physical
database design.
Creating supertype and subtype entities helps in organizing data
into hierarchical structures, enhancing data integrity and reducing
redundancy.
Creating supertype and subtype entities is unnecessary in modern
database applications.
5. What is the difference between a simple and a composite primary key?
A simple primary key only contains numeric values, while a composite
contains various data types
A simple primary key is always auto-incremented, while a composite is
not
A simple primary key is indexed, while a composite is not
A simple primary key consists of a single column, while a composite
primary key consists of multiple columns
6. Who is responsible for the design, implementation, repair, and security of a
company's database?
IT Staff
Controller
Chief Information Security Officer
Database administrator
,7. What is a API?
The overall process of determining and implementing database
requirements
the principle that physical design never effects query results
a library of procedures or classes that links a host programming
language to a database.
The logical design as specified in SQL and depicted in a table diagram
8. What does data independence enable database designers to do?
Alter the database structure without affecting data integrity.
Change application programs without modifying the database.
Ensure data redundancy in the database.
Tune query performance without changing application programs.
9. Describe how the WITH CHECK OPTION affects data integrity in SQL views.
The WITH CHECK OPTION ensures that any data modifications
through the view adhere to the conditions specified in the WHERE
clause, thus maintaining data integrity.
The WITH CHECK OPTION only applies to SELECT statements.
The WITH CHECK OPTION is used to create indexes on views.
The WITH CHECK OPTION allows any data modifications regardless
of the WHERE clause conditions.
10. A link between tables in a relational database that defines how the data are
related is called a __ _.
link
, relationship
partnership
join
11. A _____ defines the data or field that a table can hold.
column
database
key
row
12. Describe the significance of relationships in database design.
Relationships are irrelevant in database design.
Relationships are only important for data retrieval.
Relationships are crucial as they define how entities interact and
relate to one another within the database.
Relationships determine the physical storage of data.
13. What is SQL?
a set of rules for formatting data for storage and transfer
the standard command language for relational databases
the primary programming language for database client and server
application development
a specialized language designed for creating forms
HIGH-YIELD PRACTICE QUESTIONS & VERIFIED ANSWERS |
COMPREHENSIVE STUDY GUIDE | LATEST UPDATE
1. If a company experiences a data breach due to inadequate user access
controls, what aspect of a database administrator's responsibilities may have
been neglected?
Designing the database schema
Optimizing SQL query performance
Enforcing procedures for user access
Creating database backups
2. Describe the role of logical design in the context of transforming data
models into a usable database structure.
Logical design defines the security protocols for data access.
Logical design translates the entity-relationship model into a
structured format of tables, columns, and keys.
Logical design focuses on the physical storage of data on disk.
Logical design creates user interfaces for database applications.
3. A database entity has attributes. An attribute can be described as
characteristics that describe the entity
a row of data
an ERD model
a data model
,4. Describe the significance of creating supertype and subtype entities in the
database design process.
Creating supertype and subtype entities is primarily for improving
SQL query performance.
Creating supertype and subtype entities is only relevant for physical
database design.
Creating supertype and subtype entities helps in organizing data
into hierarchical structures, enhancing data integrity and reducing
redundancy.
Creating supertype and subtype entities is unnecessary in modern
database applications.
5. What is the difference between a simple and a composite primary key?
A simple primary key only contains numeric values, while a composite
contains various data types
A simple primary key is always auto-incremented, while a composite is
not
A simple primary key is indexed, while a composite is not
A simple primary key consists of a single column, while a composite
primary key consists of multiple columns
6. Who is responsible for the design, implementation, repair, and security of a
company's database?
IT Staff
Controller
Chief Information Security Officer
Database administrator
,7. What is a API?
The overall process of determining and implementing database
requirements
the principle that physical design never effects query results
a library of procedures or classes that links a host programming
language to a database.
The logical design as specified in SQL and depicted in a table diagram
8. What does data independence enable database designers to do?
Alter the database structure without affecting data integrity.
Change application programs without modifying the database.
Ensure data redundancy in the database.
Tune query performance without changing application programs.
9. Describe how the WITH CHECK OPTION affects data integrity in SQL views.
The WITH CHECK OPTION ensures that any data modifications
through the view adhere to the conditions specified in the WHERE
clause, thus maintaining data integrity.
The WITH CHECK OPTION only applies to SELECT statements.
The WITH CHECK OPTION is used to create indexes on views.
The WITH CHECK OPTION allows any data modifications regardless
of the WHERE clause conditions.
10. A link between tables in a relational database that defines how the data are
related is called a __ _.
link
, relationship
partnership
join
11. A _____ defines the data or field that a table can hold.
column
database
key
row
12. Describe the significance of relationships in database design.
Relationships are irrelevant in database design.
Relationships are only important for data retrieval.
Relationships are crucial as they define how entities interact and
relate to one another within the database.
Relationships determine the physical storage of data.
13. What is SQL?
a set of rules for formatting data for storage and transfer
the standard command language for relational databases
the primary programming language for database client and server
application development
a specialized language designed for creating forms
