Texas Database Administrator Licensing Exam Practice Questions & Answers

Texas Database Administrator Licensing Exa
b b b b




m Practice Test Questions And Correct
b b b b b b




Answers (Verified Answers) Plus Rationales b b b b




2026|2027 Q&A | Instant Download Pdf
b b b b b b




1. What is the primary purpose of a database index?
b b b b b b b b b




A. To enforce referential integrity
b b b


B. To store metadata
b b


C. To speed up data retrieval
b b b b


D. To normalize data
b b




Indexes improve the performance of data retrieval operations by allowing faster
b b b b b b b b b b b


access to rows in a table.
b b b b b




2. Which SQL command is used to remove a table and all its data?
b b b b b b b b b b b b




A. DELETE
B. DROP
C. ERASE
D. REMOVE

The DROP command deletes the table structure and its data permanently from th
b b b b b b b b b b b b


e database.
b




3. What does ACID stand for in database transactions?
b b b b b b b

,A. Access, Control, Input, Delete
b b b


B. Asynchronous, Commit, Integrity, Durability b b b


C. Atomicity, Consistency, Isolation, Durability
b b b


D. Algorithm, Consistency, Isolation, Durability
b b b




ACID ensures reliable processing of database transactions.
b b b b b b




4. In normalization, what is the purpose of converting to 3NF (Third Normal
b b b b b b b b b b b b


Form)?

A. To remove composite keys
b b b


B. To eliminate transitive dependencies
b b b


C. To ensure atomic values
b b b


D. To improve encryption
b b




Third Normal Form removes transitive dependencies to reduce redundancy and i
b b b b b b b b b b


mprove integrity.
b




5. Which type of JOIN returns all rows from both tables, matching where
b b b b b b b b b b b b


possible?

A. FULL OUTER JOIN
b b


B. INNER JOIN b


C. LEFT JOINb


D. RIGHT JOIN b




FULL OUTER JOIN returns all records when there is a match in either left or right ta
b b b b b b b b b b b b b b b b


ble.

6. What is the default isolation level in most relational databases?
b b b b b b b b b




A. Read Uncommitted
b


B. Repeatable Read b


C. Read Committed
b


D. Serializable

Read Committed is commonly the default because it balances consistency and per
b b b b b b b b b b b


formance.

, 7. Which constraint ensures that values in a column are unique?
b b b b b b b b b




A. CHECK
B. UNIQUE
C. NOT NULL
b


D. FOREIGN KEY b




The UNIQUE constraint prevents duplicate values in a column.
b b b b b b b b




8. Which data model uses tables, rows, and columns?
b b b b b b b




A. Hierarchical
B. Object-Oriented
C. Relational
D. NoSQL

Relational databases organize data in tables consisting of rows and columns.
b b b b b b b b b b




9. What is a foreign key?
b b b b




A. A unique identifier for a record
b b b b b


B. A key used to link two tables
b b b b b b


C. A key that can be null
b b b b b


D. A key that has duplicate values
b b b b b




A foreign key establishes a relationship between columns in different tables.
b b b b b b b b b b




10. Which command is used to retrieve data from a database?
b b b b b b b b b




A. INSERT
B. SELECT
C. CREATE
D. UPDATE

SELECT is used to retrieve data from one or more tables.
b b b b b b b b b b




11. What is the function of a primary key?
b b b b b b b