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Oracle 1Z0-921 Exam Syllabus Topics:

Oracle MySQL 2021 Implementation Essentials Sample Questions:

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

2. Which three are requirements for MySQL Group Replication (GR)?

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

3. Which three are levels in which MySQL Enterprise Monitor provides access control?

A) Application administration: the rights to view or change the MySQL Enterprise Monitor configuration
B) MySQL Enterprise Operations: the right to deploy the necessary MySQL Enterprise Agent
C) Specific data access: the rights to view specific types of potentially sensitive data
D) Asset visibility: the rights to access data collected from hosts or MySQL instances
E) MySQL Enterprise Operations: the right to start/stop/restart/update MySQL Enterprise Monitor Services

4. Which three are characteristics of the JSON data type?

A) Comparisons of JSON values are not case-sensitive.
B) It validates the JSON syntax on insert or merge.
C) It is based on the TEXT data type.
D) A set of SQL functions substantially support the SQL utilization of the data type.
E) Key or array references enable quick read-access to look up document elements directly.
F) It supports indexing directly against the JSON-defined column.

5. 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) The mysql.inventory table on SLAVE is cloned with the same content as MASTER, which has the same server UUID.
B) The mysql.instance table on SLAVE is cloned with the same content as MASTER, which has the same server UUID.
C) All the MySQL instances (Master and Slave) have the same server_uuid in <datadir>/auto.cnf.
D) The SLAVE and MASTER instances are started with the same configured value for the option - - monitor_server_uuid.
E) The MASTER and SLAVE are grouped as one instance for monitoring.

Solutions: