Oracle 1Z1-921 - MySQL 2021 Implementation Essentials
- Exam Code: 1Z1-921
- Exam Name: MySQL 2021 Implementation Essentials
- Updated: Oct 05, 2026
- Q & A: 78 Questions and Answers
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Oracle 1Z1-921 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Backup, Recovery, and Replication | - Replication concepts and configuration - Backup strategies |
| Security and User Management | - User accounts and privileges - Authentication plugins (PAM, AD integration) |
| Data Management and SQL Operations | - Indexing and optimization basics - SQL queries and DML operations |
| Monitoring and Troubleshooting | - Basic troubleshooting techniques - Performance monitoring |
| MySQL Architecture and Installation | - Installation and configuration - MySQL server architecture |
| Database Design and Development | - Data types and normalization - Schema design principles |
Oracle MySQL 2021 Implementation Essentials Sample Questions:
Question #1
You execute this statement:
SELECT NULL=NULL;
What is the result?
- A. 1
- B. NULL
- C. 0
- D. TRUE
- E. FALSE
Correct Answer: B 🗳️
Question #2
Which three are levels in which MySQL Enterprise Monitor provides access control?
- A. Specific data access: the rights to view specific types of potentially sensitive data
- B. Application administration: the rights to view or change the MySQL Enterprise Monitor configuration
- C. MySQL Enterprise Operations: the right to deploy the necessary MySQL Enterprise Agent
- D. MySQL Enterprise Operations: the right to start/stop/restart/update MySQL Enterprise Monitor Services
- E. Asset visibility: the rights to access data collected from hosts or MySQL instances
Correct Answer: A,B,E 🗳️
Question #3
An existing MySQL Database environment has been doing backup and restore in a logical way by using the mysq1dump and mysq1 client utilities. When the backup is started using mysqldump with single-transaction mode, the existing application has long wait time. When the restore is required, it takes more than three hours to restore.
What two are benefits of using mysqlbackup from MySQL Enterprise Backup in this situation?
- A. mysqlbackup utilities dump the full database into a SQL file, which is imported into the mysql client in single-thread mode. mysqlbackup restores data from physical backups. Physical backup methods are faster than logical methods because they involve only file coping without conversion.
- B. mysqlbackup can back up tables with the InnoDB engine without blocking. The backup is hot with InnoDB. Together with Incremental Backup, mysqlbackup from MySQL Enterprise Backup shortens the backup windows.
- C. mysqlbackup from MySQL Enterprise Backup allows logical backup with concurrency built in to get faster backup speed and restoration speed.
- D. MySQL Enterprise Backup provides tape backup integration by default. It has the virtual tape option, which allows backup to tape device directly without extra third-party software integration.
- E. MySQL Enterprise Backup does not back up system data so that it is much faster.
Correct Answer: A,C 🗳️
Question #4
You have a MySQL Server instance (running with Port# 3306) monitored by the Service Manager in MySQL Enterprise Monitor. You cloned the MySQL Database instance and configured it to be a replicated MySQL instance as Slave using Port# 3316 on the same machine as the Master Server. The replication configuration is working correctly. The Master and Slave Servers are running.
You are trying to add the newly created MySQL Slave instance to the Monitor. The Service Manager in MySQL Enterprise Monitor notifies you that the new instance is successfully added; however, it is not added correctly at the newly added configuration points to the old Master monitored items. The Monitor shows only one monitored MySQL instance for Master and Slave.
Which two are possible reasons for this problem?
- A. All the MySQL instances (Master and Slave) have the same server_uuid in <datadir>/auto.cnf.
- B. The mysql.inventory table on SLAVE is cloned with the same content as MASTER, which has the same server UUID.
- C. The MASTER and SLAVE are grouped as one instance for monitoring.
- D. The mysql.instance table on SLAVE is cloned with the same content as MASTER, which has the same server UUID.
- E. The SLAVE and MASTER instances are started with the same configured value for the option - - monitor_server_uuid.
Correct Answer: C,D 🗳️
Question #5
By using the asynchronous MySQL Replication architecture, data can be replicated to slaves. Identify three use cases of MySQL Replication.
- A. It provides multi-master access where the application can write and read data across the database servers.
- B. MySQL Replication Connector/J (ReplicationDriver) is provided to allow read capability on slave and write capability on master.
- C. MySQL Enterprise Backup will back up from Slave automatically.
- D. It allows backup to be done on the slave without impacting the master.
- E. You can create a slave server for reporting applications, which get only read access to the slave servers. It off-loads the master server. Additional servers allow different database server configuration.
Correct Answer: C,D,E 🗳️
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