Download MySQL 8.0 Database Developer.1Z0-909.Pass4Success.2026-07-22.50q.tqb

Vendor:	Oracle
Exam Code:	1Z0-909
Exam Name:	MySQL 8.0 Database Developer
Date:	Jul 22, 2026
File Size:	11 MB

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Demo Questions

Examine these my.cnf settings:

Examine this entry from /data/slow.log

Which option is also set in my.cnf?

log_queries_not_using_indexes
log__slow_admin_statements=1
log_queries_not_using_indexes=ON
log_throttle_queries_not_using_indexes=100

Correct answer: B

Examine these statements which execute successfully:

Now, examine this query:

What is the result?

It inserts a row with a warning.
It inserts a row with no error or warning.
It inserts a row with an error.
It fails with an error.
It fails with a warning.

Correct answer: B

Examine these statement which execute successfully:

Now, examine the statements executed in the mysqi command-line client:

What is true?

Correct answer: C

Examine the appointments table definition which contains one million rows:

Now, examine this statement which executes successfully:

Which statement will improve query performance?

ALTER TABLE appointments add index IX_4
ALTER TABLE appointments add index IX_1(credit,payment)
ALTER TABLE appointments add index IX_2(attendant_session_id, created_by)
ALTER TABLE appointments add index IX_3(attendant_id, created_by)

Correct answer: A

Examine the statement which executes successfully:

SET sql_mode=' NO_ENGINE_SUBSTITTJTION' ;

You try to create a table with a storage engine that is not available. What will happen?

An error occurs and the create table statement fails.
The server will create the table but it will be unusable until the specified storage engine is available.
The server will create the table but report an error when the first attempt to insert a row is performed.
The server will create the table using the default storage engine.

Correct answer: A

Which two statements are true about AUTO_INCREMENT?

AUTO_INCREMENT values allocated to a transaction that is rolled back are not reused.
A table can have multiple AUTO_INCREMENT columns.
A server restart always resets the AUTO_INCREMENT value to largest value in the AUTO_INCREMENT column plus 1.
The decimal data type supports AUTO_INCREMENT.
An AUTO_INCREMENT column must be indexed.

Correct answer: A, E

Examine this statement and output:

Which is true?

The underlying table's index on the Name column is not chosen because of low selectivity.
myview cannot be automatically indexed.
myview was defined with the temptable processing algorithm.
Column Name in myview can be indexed if the is_updatable attribute is true.

Correct answer: C

Examine this statement:

DECLARE not_found CONDITION FOR SQLSTATE '02000';

In which two statements can not found be used?

in a handler declaration
in an if statement
in a signal statement
in a leave statement to exit a loop
in a while loop

Correct answer: C, E

Examine the structure of the emp table:

Examine the structure of the emp_vu1 view based on the emp table:

Now, examine this statement:

mysq1> INSERT INTO emp_vul VALUES ('Alice',20000) ;

What is true about executing the statement?

It inserts a row in the emp table.
It returns an error because an insert operation is not allowed on views.
It inserts a row in the view only.
It returns an error because the PRIMARY ACCOUNT column is not selected for the view definition.

Correct answer: A

Examine these statements which execute successfully: