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Oracle 1Z0-921 Exam Syllabus Topics:

Oracle MySQL 2021 Implementation Essentials Sample Questions:

1. Which best describes database horizontal scale-out architecture deployment in MySQL in a read-heavy environment?

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

2. Which three are recommended configurations for installing and running MySQL InnoDB Cluster?

A) The number of machines per group must be 3, 5, 7 or 9.
B) isolated machine resources
C) Groups must be in even numbers; 2, 4, 6, 8.
D) Networks must be in separate regions.
E) smaller VM,s work best - with a maximum of eight vCPU,s and 16GB of RAM
F) Use Network-attached storage (NAS) for the data files.
G) use SSD,s for data and replication logs

3. By using the asynchronous MySQL Replication architecture, data can be replicated to slaves. Identify three use cases of MySQL Replication.

A) It allows backup to be done on the slave without impacting the master.
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) 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.
E) It provides multi-master access where the application can write and read data across the database servers.

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

5. You get a maintenance-notification about your MySQL Enterprise Edition in Oracle Cloud Infrastructure (OCI) Compute instance. What is re the implication?

A) There are no maintenance operations planned. You need to do them manually.
B) Depending on the planned outage, you may not be affected by it. You need to read the maintenance details in the support notice.
C) You need to agree to the maintenance windows. If not, you are not affected by the outage.
D) You can expect an outage of your MySQL OCI instance during the planned time..

Solutions: