D426 WGU EXAM / WGU D426 LATEST EXAM
STUDY GUIDE ACTUAL EXAM QUESTIONS AND
WELL ELABORATED ANSWERS ( 400 MOST
TESTED QUESTIONS WITH VERIFIED ANSWERS)
LATEST UPDATES 2026 |ALREADY GRADED A+
(REVISED EXAM)
1. What is a software that reads and writes data in a database?
Answer-Database management system or DBMS
2. What is a computer programming language for writing database
queries?
Answer-Query language
3. What is a command for a database that typically inserts new data,
retrieves data, updates data, or deletes data from a database?
Answer-Query
4. What is a group of queries that must be either completed or
rejected as a whole?
Answer-A transaction
,5. What interprets queries, creates a plan to modify the database or
retrieve data, and returns query results to the application?
Answer-A query processor
6. What translates the query processor instructions into low-level
file-system commands that modify or retrieve data?
Answer-Store Manager
7. What ensures transactions are properly executed?
Answer-Transaction Manager
8. What is a file containing a complete record of all inserts, updates,
and deletes processed by the database?
Answer-The log
9. What is a directory of tables, columns, indexes, and other
database objects?
Answer-Catalog
10. What is a column, used to identify individual rows of a table?
Answer-A key
11. Which phase implements database requirements in a specific
database system?
Answer-Database Logical design phase
,12. Which phase specifies database objects such as tables, columns,
data types, and indexes?
Answer-Database design phase
13. What is the structured organization of data into rows and
columns called?
Answer-A table
14. What is a single row in a database table called?
Answer-A record
15. What is a vertical component of a table that stores one type of
data?
Answer-A column
16. What is the collection of allowed values for an attribute called?
Answer-A domain
17. What is a column or combination of columns that uniquely
identifies each row?
Answer-A primary key
, 18. What is a column that references a primary key in another
table?
Answer-A foreign key
19. What is a relationship in which one row in one table can be
associated with many rows in another table?
Answer-One-to-many relationship
20. What is a relationship in which one row in a table can be
associated with only one row in another table?
Answer-One-to-one relationship
21. What type of NoSQL database stores data as documents, typically using formats such as
JSON or BSON?
Answer: . Document database
22. What database object is used to implement a many-to-many
relationship?
Answer-A junction table
23. What is the process of organizing a database to reduce
redundancy and improve data integrity?
Answer-Normalization
STUDY GUIDE ACTUAL EXAM QUESTIONS AND
WELL ELABORATED ANSWERS ( 400 MOST
TESTED QUESTIONS WITH VERIFIED ANSWERS)
LATEST UPDATES 2026 |ALREADY GRADED A+
(REVISED EXAM)
1. What is a software that reads and writes data in a database?
Answer-Database management system or DBMS
2. What is a computer programming language for writing database
queries?
Answer-Query language
3. What is a command for a database that typically inserts new data,
retrieves data, updates data, or deletes data from a database?
Answer-Query
4. What is a group of queries that must be either completed or
rejected as a whole?
Answer-A transaction
,5. What interprets queries, creates a plan to modify the database or
retrieve data, and returns query results to the application?
Answer-A query processor
6. What translates the query processor instructions into low-level
file-system commands that modify or retrieve data?
Answer-Store Manager
7. What ensures transactions are properly executed?
Answer-Transaction Manager
8. What is a file containing a complete record of all inserts, updates,
and deletes processed by the database?
Answer-The log
9. What is a directory of tables, columns, indexes, and other
database objects?
Answer-Catalog
10. What is a column, used to identify individual rows of a table?
Answer-A key
11. Which phase implements database requirements in a specific
database system?
Answer-Database Logical design phase
,12. Which phase specifies database objects such as tables, columns,
data types, and indexes?
Answer-Database design phase
13. What is the structured organization of data into rows and
columns called?
Answer-A table
14. What is a single row in a database table called?
Answer-A record
15. What is a vertical component of a table that stores one type of
data?
Answer-A column
16. What is the collection of allowed values for an attribute called?
Answer-A domain
17. What is a column or combination of columns that uniquely
identifies each row?
Answer-A primary key
, 18. What is a column that references a primary key in another
table?
Answer-A foreign key
19. What is a relationship in which one row in one table can be
associated with many rows in another table?
Answer-One-to-many relationship
20. What is a relationship in which one row in a table can be
associated with only one row in another table?
Answer-One-to-one relationship
21. What type of NoSQL database stores data as documents, typically using formats such as
JSON or BSON?
Answer: . Document database
22. What database object is used to implement a many-to-many
relationship?
Answer-A junction table
23. What is the process of organizing a database to reduce
redundancy and improve data integrity?
Answer-Normalization
