[2025] Pass Oracle 1z0-915-1 Exam Updated 67 Questions
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NEW QUESTION # 28
Which type of configuration variables CANNOT be modified in MySQL custom configurations?
- A. Default user variables
- B. Initialization variables
- C. System variables
- D. User variables
Answer: B
Explanation:
Initialization variables(Answer A) cannot be modified in MySQL custom configurations. These variables are set at the start of the MySQL service and are not changeable without restarting the service.
* Initialization variables are parameters that define how the MySQL server initializes.
* Changes to these variables require restarting the MySQL server to take effect.
* Examples include variables likeinnodb_buffer_pool_size, which determine memory allocation settings on startup.
References:
* MySQL Configuration Variables Documentation
NEW QUESTION # 29
Which MySQL HeatWave AutoML routine evaluates a model?
- A. ML_TRAIN
- B. ML_EXPLAIN
- C. ML_PREDICT_TABLE
- D. ML_EXPLAIN_TABLE
- E. ML_SCORE
Answer: E
Explanation:
The MySQL HeatWave AutoML routine that evaluates a model isML_SCORE. This routine scores a trained machine learning model on a new dataset and evaluates its performance.
NEW QUESTION # 30
You have successfully enabled high availability of a stand-alone DB system. Which is true?
- A. The DB system has three instances running in different availability or fault domains.
- B. The DB system provides new port numbers on the same endpoint to connect to the secondary instances for read-only connections.
- C. The DB system provides new endpoints to connect to the secondary instances for read-only connections.
- D. The DB system performs load balancing by distributing client connections to all instances.
Answer: A
Explanation:
When high availability is enabled for a stand-alone DB system,the DB system has three instances running in different availability or fault domains(Answer D).
* High Availability Configuration: This setup involves creating multiple instances of the DB system across different availability or fault domains to ensure redundancy and minimize the risk of downtime due to hardware or network failures.
* Instances: Typically, there are three instances-one primary and two replicas-ensuring that the system can failover seamlessly if one instance goes down.
References:
* OCI MySQL High Availability
NEW QUESTION # 31
You have successfully provisioned a MySQL DB system on Oracle Cloud Infrastructure by using OCI Console. You have installed the standard MySQL client libraries and MySQL Shell on your workstation that is not connected to any VPN, FastConnect, or SSH tunnel.
You CANNOT connect directly to the DB system endpoint from your workstation connected to the Internet.
What is the reason?
- A. MySQL DB system cannot use the standard MySQL client libraries.
- B. MySQL DB system endpoint does not have a public IP address.
- C. MySQL DB system allows only connections through a proxy server.
- D. MySQL DB system allows only SSL-encrypted connections.
Answer: B
Explanation:
If you cannot connect directly to the MySQL DB system endpoint from your workstation connected to the Internet, the reason is thatMySQL DB system endpoint does not have a public IP address(Answer B).
* Private Subnet: The MySQL DB system is provisioned in a private subnet, which means it is not directly accessible from the Internet.
* Network Accessibility: To access the DB system, you need to establish a secure connection via a VPN, FastConnect, or SSH tunnel.
References:
* Connecting to a MySQL DB System
* OCI Networking Documentation
NEW QUESTION # 32
You want to change the configuration of an active stand-alone DB system. The DB system is configured as the target of a channel, and the channel is currently active.
Which sequence of steps must you perform?
- A. Stop the channel, edit the DB system, change the configuration, and start the channel.
- B. Delete the channel, edit the DB system, change the configuration, and re-create the channel.
- C. Edit the DB system and change the configuration.
- D. Stop the DB system, edit the DB system, change the configuration, and start the DB system.
Answer: A
Explanation:
To change the configuration of an active stand-alone DB system that is configured as the target of a channel, and the channel is currently active, you must:
D:Stop the channel, edit the DB system, change the configuration, and start the channel: This sequence ensures that no data inconsistency or replication issues occur while the configuration changes are being applied.
NEW QUESTION # 33
Which two methods can you use to import data into a MySQL DB system by using MySQL Shell? (Choose two.)
- A. util.importTable()
- B. util.dumpInstance()
- C. util.loadDump()
- D. util.dumpSchemas()
Answer: A,C
Explanation:
Two methods to import data into a MySQL DB system using MySQL Shell are:
A:util.importTable(): This utility imports data from a file into a table. D.util.loadDump(): This utility loads a previously dumped database or table into a MySQL DB system.
NEW QUESTION # 34
You want to create a new DB system with data import. How do you prepare the data?
- A. Export the data into anObject Storage bucket with a MySQL Shell dump utility.
- B. Back up the database into an Object Storage bucket with MySQL Enterprise Backup.
- C. Export the data into the file system with the mysqldump client utility.
- D. Export the data into the file system with a MySQL Shell dump utility
Answer: A
Explanation:
To prepare data for a new DB system with data import in OCI, you shouldexport the data into an Object Storage bucket with a MySQL Shell dump utility(Answer B). This method allows you to store the data in a scalable and durable object storage service before importing it into the new DB system.
Steps:
* Use MySQL Shell dump utility to export the data.
* Save the export files to an Object Storage bucket in OCI.
* Import the data from the Object Storage bucket into the new DB system.
References:
* MySQL Shell Documentation
* OCI Object Storage Documentation
NEW QUESTION # 35
Automatic backup retention of a DB system is disabled. Which operation deletes all automatic backups of the DB system?
- A. Deleting the DB system
- B. Disabling delete protection
- C. Disabling point-in-time recovery
- D. Enabling point-in-time recovery
Answer: A
Explanation:
When automatic backup retention of a DB system is disabled,deleting the DB system(Answer C) will delete all automatic backups of the DB system.
* Automatic Backups: These are backups created automatically by the OCI service to ensure data protection.
* Backup Deletion: If automatic backups are disabled and you delete the DB system, all associated automatic backups are also deleted. This operation is irreversible, and you should ensure that necessary backups are taken before deleting the DB system.
References:
* OCI MySQL Database Service Backup and Restore
NEW QUESTION # 36
Which three operations can be performed on a MySQL HeatWave backup? (Choose three.)
- A. Delete an active manual backup when point-in-time recovery is enabled on the DB system.
- B. Change the retention period of an active automatic backup.
- C. Change the retention period of an active manual backup.
- D. Move an active backup to another compartment.
- E. Restore an active backup to a new DB system in another region.
Answer: C,D,E
Explanation:
Three operations that can be performed on a MySQL HeatWave backup are:
B:Change the retention period of an active manual backup: You can adjust how long the backup is retained.
C:Restore an active backup to a new DB system in another region: You can restore backups to different regions for disaster recovery or data migration. E.Move an active backup to another compartment: You can organize and manage backups by moving them to different compartments.
NEW QUESTION # 37
Which feature do you use to copy transactions from an on-premises MySQL instance to a DB system?
- A. Inbound replication
- B. Read replica
- C. Outbound replication
- D. HeatWave cluster
Answer: A
Explanation:
To copy transactions from an on-premises MySQL instance to a DB system, you useinbound replication(Answer B).
* Inbound Replication: This feature allows the MySQL DB system to receive and apply changes (transactions) from an external MySQL instance.
* Replication Configuration: You need to set up replication between the on-premises MySQL instance and the MySQL DB system by configuring the master (on-premises) and the slave (DB system) appropriately.
References:
* MySQL Replication Documentation
* OCI MySQL Database Service Documentation
NEW QUESTION # 38
You want to restore a stand-alone DB system to a high-availability DB system with a point-in-time recovery.
Which three are required? (Choose three.)
- A. Point-in-time recovery must be enabled before the point in time to which you want to restore.
- B. Every user table must have a primary key.
- C. An automatic backup taken before the selected point in time must be available.
- D. The stand-alone DB system must remain active during the restore.
- E. A manual backup taken before the selected point in time must be available.
Answer: A,C,E
NEW QUESTION # 39
Which is true about changing the storage size of a DB system?
- A. You must stop the DB system before changing its storage size.
- B. You cannot decrease the DB system's storage size.
- C. The DB system shuts down during the resize operation.
- D. You must increase the DB system's storage size in multiples of 100 GB.
Answer: B
Explanation:
When changing the storage size of a DB system,you cannot decrease the DB system's storage size(Answer B).
This restriction ensures data integrity and prevents potential data loss that could occur if the storage size were reduced.
* You can only increase the storage size of the DB system.
* The storage increase is done online without shutting down the DB system, allowing for uninterrupted
* operations.
References:
* OCI MySQL DB System Scaling Documentation
NEW QUESTION # 40
You run this command to connect successfully to a DB system:
mysqlsh [email protected] --auth-method=authentication_oci_client
Why does the command NOT require a password?
- A. The correct password is saved in the local MySQL Shell secret store.
- B. The operating system user credential is used to authenticate with the DB system.
- C. The credential is stored in an OCI vault secret.
- D. The correct API key-pair is specified in the -/. oci. config file.
Answer: D
Explanation:
The commandmysqlsh [email protected] --auth-method=authentication_oci_clientdoes not require a password because it uses the OCI (Oracle Cloud Infrastructure) client authentication method. This method relies on the correct API key-pair specified in the~/.oci/configfile. This file contains the necessary credentials (user OCID, tenancy OCID, API keys, etc.) to authenticate with the OCI environment without needing a password for each connection.
NEW QUESTION # 41
Which two methods can be used to stop a DB system? (Choose two.)
- A. Run the SHUTDOWN SQL statement from any connected client logged in as the admin user.
- B. Execute the mysql db-system stop command from OCI CLI.
- C. Use the STOP action on the DB system details page in the OCI Console.
- D. Run the shutdown command from a mysqladmin client logged in as the admin user.
Answer: B,C
Explanation:
You can stop a MySQL DB system using the following methods:
A:Use the STOP action on the DB system details page in the OCI Console: This is a straightforward way to stop the DB system via the Oracle Cloud Infrastructure web interface. D.Execute themysql db-system stop command from OCI CLI: This command uses the Oracle Cloud Infrastructure Command Line Interface to stop the DB system programmatically.
NEW QUESTION # 42
Which two are available when creating a new MySQL DB system in OCI Console? (Choose two.)
- A. Read replica
- B. High availability
- C. Lakehouse
- D. Standalone server
- E. HeatWave cluster
Answer: B,D
Explanation:
When creating a new MySQL DB system in the OCI Console, you have the following options:
* High availability(Answer A): This option allows you to create a DB system that can automatically fail over to a standby instance in case of hardware or software failure, ensuring minimal downtime.
* Standalone server(Answer C): This option lets you create a DB system with a single instance, suitable for workloads that do not require high availability or read replicas.
References:
* OCI MySQL Database Service Documentation
* MySQL High Availability
NEW QUESTION # 43
What happens when you perform a switchover of a high-availability DB system with an attached HeatWave cluster?
- A. The HeatWave cluster is attached to the new primary instance.
- B. The HeatWave cluster is no longer valid; you must re-create the HeatWave cluster.
- C. The HeatWave cluster remains attached to the same DB system and the new primary instance redirects queries to that cluster.
- D. The HeatWave cluster is deleted and a new HeatWave cluster is attached to the new primary instance.
Answer: A
Explanation:
When you perform a switchover of a high-availability DB system with an attached HeatWave cluster, theHeatWave cluster is attached to the new primary instance(Answer B). This ensures continuous operation and access to the HeatWave cluster's capabilities without the need to delete or re-create the cluster.
* During a switchover, the system promotes the standby instance to the primary role.
* The HeatWave cluster, which was previously attached to the original primary instance, is now re-attached to the new primary instance.
* This allows the new primary instance to continue processing queries using the HeatWave cluster seamlessly.
References:
* MySQL HeatWave High Availability Documentation
NEW QUESTION # 44
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