MySQL 8.0 Database Developer (1Z0-909) Exam Questions 2026
MySQL 8.0 Database Developer (1Z0-909) Exam Questions 2026
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Question 1:
What is the purpose of the EXPLAIN statement in MySQL?
A. To execute a query and retrieve the result set.
B. To retrieve metadata about the tables used in a query.
C. To optimize the query syntax.
D. To analyze the query execution plan.
Answer: D
Explanation:
The EXPLAIN statement in MySQL is used to analyze the query execution plan, helping to identify performance bottlenecks and optimize the query.
Question 2:
What is the purpose of a MySQL stored procedure?
A. To manage database connections
B. To load and store data in a database
C. To define custom functions
D. To execute a sequence of SQL statements
Answer: D
Explanation:
The purpose of a MySQL stored procedure is to execute a sequence of SQL statements.
Question 3:
Which MySQL configuration option can be adjusted to control the maximum number of rows examined for query optimization?
A. max_rows_examined
B. max_examined_rows
C. optimization_max_rows
D. query_optimization_rows
Answer: A
Explanation:
The MySQL configuration option “max_rows_examined“ can be adjusted to control the maximum number of rows examined for query optimization, helping to limit the resources consumed by query execution.
Question 4:
What is the purpose of the ORDER BY clause in a SQL query?
A. To sort the queried data in ascending or descending order
B. To join multiple tables in a query
C. To aggregate data and perform calculations
D. To filter the data based on a specific condition
Answer: A
Explanation:
The ORDER BY clause is used to sort the queried data in ascending or descending order in a SQL query.
Question 5:
What is the purpose of the INNER JOIN clause in a SQL query?
A. To filter the data based on a specific condition
B. To sort the queried data in ascending or descending order
C. To aggregate data from multiple tables
D. To combine rows from different tables based on a related column
Answer: D
Explanation:
The INNER JOIN clause is used to combine rows from different tables based on a related column in a SQL query.
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Question 6:
What is the purpose of a MySQL trigger?
A. To automatically index columns in a table
B. To create temporary tables in a database
C. To perform actions before or after an INSERT, UPDATE, or DELETE operation on a table
D. To encrypt data in a table
Answer: C
Explanation:
The purpose of a MySQL trigger is to perform actions before or after an INSERT, UPDATE, or DELETE operation on a table.
Question 7:
What is the purpose of the LIMIT clause in a SQL query?
A. To specify the number of records to be deleted
B. To join multiple tables in a query
C. To order the queried data in ascending order
D. To restrict the number of rows returned by a query
Answer: D
Explanation:
The LIMIT clause is used to restrict the number of rows returned by a query.
Question 8:
What is the purpose of query rewriting in query optimization?
A.To modify a query to enhance performance.
B.To remove unnecessary calculations from a query.
C.To convert a query into an optimized execution plan.
D.To rewrite a query using simpler syntax.
Answer: A
Explanation:
Query rewriting is the process of modifying a query to enhance performance, by rewriting the query structure or introducing optimization techniques.
Question 9:
What is the purpose of using savepoints in a transaction?
A. To optimize the query execution plan
B. To specify a point in a transaction where it can be rolled back to if needed
C. To isolate concurrent transactions from each other
D. To create temporary tables within a transaction
Answer: B
Explanation:
Savepoints in a transaction are used to specify a point within the transaction where it can be rolled back to if needed.
Question 10:
What is the default value for a TIMESTAMP column in MySQL?
A. 1
B. NULL
C. CURRENT_TIMESTAMP
Answer: B
Explanation:
NULL
By default, a TIMESTAMP column in MySQL is initialized with a NULL value. If you want to automatically set the current timestamp when a new row is inserted, you can use the DEFAULT CURRENT_TIMESTAMP clause during table creation.
For a full set of 380 questions. Go to
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SkillCertPro offers detailed explanations to each question which helps to understand the concepts better.
It is recommended to score above 85% in SkillCertPro exams before attempting a real exam.
SkillCertPro updates exam questions every 2 weeks.
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