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Oracle MySQL Implementation Associate Sample Questions (Q323-Q328):

NEW QUESTION # 323
Which component of MySQL is responsible for parsing SQL queries and generating an execution plan?

A. Query Optimizer
B. MySQL Server
C. Storage Engine
D. Information Schema

Answer: A

Explanation:
The Query Optimizer in MySQL is responsible for parsing SQL queries and generating an optimal execution plan for retrieving or modifying data. It decides the best way to execute a query based on available indexes, table statistics, and other factors.

NEW QUESTION # 324
Which of the following is not a valid SQL JOIN in MySQL?

A. CROSS JOIN
B. CONDITIONAL JOIN
C. NATURAL JOIN
D. SELF JOIN

Answer: B

Explanation:
CONDITIONAL JOIN is not a valid SQL join type. The other options (NATURAL, SELF, and CROSS) are valid types of joins in MySQL.

NEW QUESTION # 325
Which isolation level should be used to prevent dirty reads but allow non-repeatable reads?

A. REPEATABLE READ
B. READ COMMITTED
C. SERIALIZABLE
D. READ UNCOMMITTED

Answer: B

Explanation:
READ COMMITTED prevents dirty reads, meaning transactions cannot see uncommitted data from other transactions. However, it allows non-repeatable reads, meaning data might change if read multiple times within a transaction.

NEW QUESTION # 326
Which MySQL Enterprise Security Tool can help prevent SQL injection attacks by analyzing and blocking suspicious queries?

A. MySQL Enterprise Authentication
B. MySQL Enterprise Firewall
C. MySQL Enterprise Audit
D. MySQL Enterprise Backup

Answer: B

Explanation:
MySQL Enterprise Firewall helps prevent SQL injection attacks by analyzing incoming queries and blocking those that appear suspicious or unauthorized. It learns legitimate query patterns over time and protects the database from malicious SQL queries.

NEW QUESTION # 327
What does the FOREIGN KEY constraint do in MySQL?

A. Creates an index for a column
B. Ensures that all values in a column are unique
C. Prevents NULL values in a column
D. Enforces a relationship between two tables

Answer: D

Explanation:
A FOREIGN KEY enforces a relationship between two tables, ensuring that values in the foreign key column correspond to values in the primary key of the related table.

NEW QUESTION # 328
......

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