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Oracle 1Z0-921 Exam consists of 60 multiple-choice questions that you must complete within 105 minutes. The questions are designed to test your knowledge and skills in various areas of MySQL, such as data types, indexes, transactions, replication, backup and recovery, and security. To Pass 1Z0-921 Exam, you must score at least 63% of the total marks. Obtaining this certification will demonstrate your proficiency in MySQL and boost your credibility as a database professional.

Oracle MySQL 2021 Implementation Essentials Sample Questions (Q22-Q27):

NEW QUESTION # 22
Which query will find rows in a table that have no counterpart in another table?

A. SELECT *FROM table1 INNER JOIN table2 ON table1.id=table2.id WHERE table1.id=! table2.id;
B. SELECT t1.name, t2.name2FROM employee t1 INNER JOIN info t2 WHERE t1.name=t2.name;
C. SELECT t1.name, t2.name2FROM employee AS t1 INNER JOIN info AS t2 ON t1.name= t2.name2;
D. SELECT left_tbl.*FROM left_tbl LEFT JOIN right_tbl ON left_tbl.id=right_tbl.idWHERE right_tbl.id IS NULL;

Answer: D

NEW QUESTION # 23
What are Security Lists in Oracle Cloud Infrastructure?

A. They contain rules established by HIPAA for securing end-user data.
B. Security lists are data encryption levels that control who can see the data.
C. They allow administrators access to applications in the cloud and external servers.
D. They are user-role designations that assign rights to certain internal users and external users.
E. They are essentially firewall rules that help control traffic between OCI instances.

Answer: E

NEW QUESTION # 24
Which three are requirements for MySQL Group Replication (GR)?

A. GR only works with MySQL versions 8.0.12 or higher.
B. Primary keys are required on every replicated table.
C. The use of global transaction identifiers is required.
D. The minimum number of required nodes for achieving a consensus is two.
E. The binary log format must be set to mixed.
F. Data to be replicated must be stored in the InnoDB transactional storage engine.

Answer: B,E,F

NEW QUESTION # 25
After installing MySQL 8.0, you initialize the data directory with the --initialize command. Which two are places where you can find the root password?

A. The root_pw variable stored in the mysq1.install table.
B. The root password inserted in the error log set by the --log-error=[file_name] variable
C. The root password displayed on the screen via a [warning] message.
D. As root, execute the show password command by using the SHA-256 password encryption plug-in.
E. The root password is not given and is blank. You must manually set the root password.

Answer: A,D

NEW QUESTION # 26
Which three statements are true about MySQL Enterprise Backup?

A. It performs logical backups.
B. It cannot back up encrypted tablespaces.
C. It enables you to take non-locking backups.
D. It provides the ability to create incremental backups.
E. It performs hot or warm backups.

Answer: A,C,D

NEW QUESTION # 27
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