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To prepare for the Oracle 1Z0-921 Certification Exam, candidates can take advantage of various study resources such as online courses, books, and practice exams. Oracle offers official MySQL training courses, which cover the topics covered in the exam and provide hands-on practice with MySQL databases.

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To pass the Oracle 1Z0-921 certification exam, candidates must demonstrate their proficiency in various topics related to MySQL database implementation. These topics include MySQL server configuration, database design and creation, data types and structures, SQL query optimization, backup and recovery, security, and troubleshooting. 1Z0-921 Exam consists of 70 multiple-choice questions that must be completed within 105 minutes.

Oracle MySQL 2021 Implementation Essentials Sample Questions (Q42-Q47):

NEW QUESTION # 42
Which three components can MySQL InnoDB Cluster use to Achieve database high availability?

A. MySQL Router to ensure client requests are load balanced and routed to the correct servers.
B. MySQL Shell to create and administer InnoDB Clusters using the built-in AdminAPI.
C. MySQL Servers with Group Replication to replicate data to all members of the cluster.
D. MySQL X Plugin to enable MySQL to use the X Protocol to speed up and monitor data replication.
E. MySQL Online Hot Backup to keep data consistent and always ready to be used.

Answer: A,B,C

NEW QUESTION # 43
The replication for a Master and Slave MySQL Servers is up and running. The disk space for Master Server is continuously growing. The binlog size keeps growing. Which two methods can fix the issue?

A. To safely purge binary log files, perform these steps:
B. On the Master server, disable binlog by removing the --log-bin option.
C. Execute the purge binary logs statement without argument.
D. Set the expire_logs_days system variable to expire binary log files automatically after a given number of days.
E. Delete all binlog files manually on the file system to release storage spaces.

Answer: A,D

NEW QUESTION # 44
Which statement would you use to remove the population column from the city table?

A. ALTER TABLE city DROP population;
B. ALTER TABLE city LESS population;
C. ALTER TABLE city DELETE population;
D. DELETE population FROM city;
E. DROP population FROM city;

Answer: A

NEW QUESTION # 45
Which best describes database horizontal scale-out architecture deployment in MySQL in a read-heavy environment?

A. Increasing the memory capacity so that there is a larger pooling buffer to increase the database read performance.
B. Adding more MySQL servers and sharing the same dacadir on a shared storage component like NFS.
C. Increasing the storage capacity so that the database can store more data to scale.
D. Allocating more CPU to the database instance to improve throughput performance.
E. Deploy MySQL read-only slaves utilizing replication so that the slaves can be used for reads.

Answer: C

NEW QUESTION # 46
Which MySQL command is used to grant specific privileges to a user on a database?
Response:

A. GRANT PERMISSIONS
B. GRANT
C. GIVE ACCESS
D. SET PRIVILEGES

Answer: B

NEW QUESTION # 47
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