[Nov 30, 2025] Get New 1z0-915-1 Certification – Valid Exam Dumps Questions
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NEW QUESTION # 36
There are more than 10 concurrent users running queries on the DB system. The airport_geo table has been loaded successfully into a HeatWave cluster.
You want to run this query:
SELECT DISTINCT country FROM airport_geo ORDER BY country;
How do you determine whether the query is offloaded to the HeatWave cluster for execution?
- A. Query the rpd_tables table in performance_schema.
- B. Check the value of the hw_data_scanned global status variable.
- C. View the Query Execution Plan of the query by running EXPLAIN.
- D. Check the value of the rapid_query_offload_count global status variable.
Answer: D
Explanation:
To determine whether a query is offloaded to the HeatWave cluster for execution,check the value of the rapid_query_offload_countglobal status variable(Answer B).
* rapid_query_offload_count: This variable indicates the number of queries that have been offloaded to the HeatWave cluster. By checking its value before and after running the query, you can determine if the query was offloaded.
Steps:
* Connect to the MySQL DB system.
* RunSHOW GLOBAL STATUS LIKE 'rapid_query_offload_count';before and after executing the query to see if the count increases, indicating offloading.
References:
* MySQL HeatWave Documentation
* Monitoring HeatWave Status Variables
NEW QUESTION # 37
You create a new MySQL DB system. It fails because you use mysql.sys as the administrator username.
What is the reason?
- A. The username cannot contain non-alphanumeric characters, such as a period.
- B. The username can contain only uppercase characters.
- C. The username must have at least 10 characters.
- D. mysql.sys is a reserved username that cannot be used in customer-defined user accounts.
Answer: D
Explanation:
The MySQL usermysql.sysis a reserved username used by the system for internal purposes. It cannot be used as a customer-defined user account to prevent conflicts with the system operations and maintain the integrity of the database's internal workings.
NEW QUESTION # 38
You have a MySQL DB system with five active read replicas. The workload consists of 5% writes and 95% reads.
Which connection method provides the fastest query response time?
- A. Connect to the source DB system to perform read-only operations.
- B. Connect to the read replica load balancer to perform read/write operations.
- C. Connect to the read replica load balancer to perform read-only operations.
- D. Connect to a specific read replica to perform read-only operations.
Answer: C
Explanation:
For a MySQL DB system with five active read replicas and a workload consisting mostly of reads, the fastest query response time is achieved by:
C:Connect to the read replica load balancer to perform read-only operations: The read replica load balancer distributes the read workload across all replicas, optimizing performance and response time.
NEW QUESTION # 39
You want to restore the backup of a stand-alone DB system to a new DB system.
Which two changes are allowed? (Choose two.)
- A. Use a different tenancy for the new DB system.
- B. Use a smaller data storage size for the new DB system.
- C. Use a different subnet for the new DB system.
- D. Use a different region for the new DB system.
- E. Use a different shape for the new DB system.
Answer: C,E
Explanation:
When restoring the backup of a stand-alone DB system to a new DB system, the following changes are allowed:
* Use a different subnet for the new DB system(Answer B): You can select a different subnet within the same VCN or a different VCN for the new DB system, providing flexibility in network configuration.
* Use a different shape for the new DB system(Answer C): You can choose a different compute shape for the new DB system, allowing you to scale the compute resources according to the requirements.
References:
* OCI MySQL Database Service Backup and Restore Documentation
NEW QUESTION # 40
Which two are available when creating a new MySQL DB system in OCI Console? (Choose two.)
- A. Read replica
- B. HeatWave cluster
- C. Lakehouse
- D. Standalone server
- E. High availability
Answer: D,E
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 # 41
A query is not offloaded to the HeatWave cluster for execution. Which three are possible reasons? (Choose three.)
- A. The use_secondary_engine session variable is OFF.
- B. The client is connected to the DB system instead of the HeatWave cluster.
- C. The query estimated cost is less than the query cost threshold.
- D. A required column is excluded from the RAPID secondary engine.
- E. The user does not have privileges to access the HeatWave cluster.
Answer: A,B,D
Explanation:
A query may not be offloaded to the HeatWave cluster for execution due to the following reasons:
A:Theuse_secondary_enginesession variable is OFF: This setting controls whether queries should be offloaded to the secondary engine (HeatWave). B.The client is connected to the DB system instead of the HeatWave cluster: For queries to be offloaded, the client must be connected to the HeatWave cluster. E.A required column is excluded from the RAPID secondary engine: If a necessary column is not available in the HeatWave (RAPID) secondary engine, the query cannot be offloaded.
NEW QUESTION # 42
You want to create a new DB system with data import. How do you prepare the data?
- A. Export the data into the file system with a MySQL Shell dump utility
- B. Export the data into the file system with the mysqldump client utility.
- C. Export the data into anObject Storage bucket with a MySQL Shell dump utility.
- D. Back up the database into an Object Storage bucket with MySQL Enterprise Backup.
Answer: C
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 # 43
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 allows only connections through a proxy server.
- B. MySQL DB system allows only SSL-encrypted connections.
- C. MySQL DB system endpoint does not have a public IP address.
- D. MySQL DB system cannot use the standard MySQL client libraries.
Answer: C
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 # 44
Which is true about exporting data to Object Storage with MySQL Shell util.dumpInstance?
- A. You must specify ocimds: true.
- B. You must provide an OCI username and password to gain write access to Object Storage.
- C. You must specify ociParManifest: true.
- D. You must have a valid OCI CLI configuration.
Answer: C
Explanation:
When exporting data to Object Storage withMySQL Shell util.dumpInstance,you must specify ociParManifest: true(Answer B). This option creates a pre-authenticated request (PAR) manifest file, which allows for secure access and upload to Object Storage without requiring direct credentials.
References:
* MySQL Shell Documentation
* OCI Object Storage Documentation
NEW QUESTION # 45
Which type of configuration variables CANNOT be modified in MySQL custom configurations?
- A. Initialization variables
- B. User variables
- C. System variables
- D. Default user variables
Answer: A
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 # 46
You have obtained a new tenancy on Oracle Cloud Infrastructure. You first create a VCN by using the VCN Wizard, and then create a MySQL DB system. You want to create a Connection in Database tools to use the SQL Worksheet feature.
Which three steps are required? (Choose three.)
- A. Create an OCI password.
- B. Create an OCI vault.
- C. Create an OCI secret.
- D. Create an encryption key.
- E. Import an X.509 certificate into the OCI vault.
Answer: A,C,E
Explanation:
To create a connection in Database Tools to use the SQL Worksheet feature, the following steps are required:
* Create an OCI password(Answer A): This password is necessary for authentication when connecting to the MySQL DB system.
* Create an OCI secret(Answer D): Secrets are used to store sensitive information like passwords securely. The secret will contain the database credentials.
* Import an X.509 certificate into the OCI vault(Answer E): This certificate is required for secure connections to the database, ensuring encrypted communication.
References:
* OCI Database Tools Documentation
* Using OCI Secrets
* X.509 Certificates Documentation
NEW QUESTION # 47
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. Use the STOP action on the DB system details page in the OCI Console.
- C. Execute the mysql db-system stop command from OCI CLI.
- 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 # 48
What must you do to minimize a DB system down time caused by automatic maintenance operations?
- A. Add HeatWave cluster.
- B. Enable crash recovery.
- C. Enable high availability.
- D. Create read replicas.
Answer: C
Explanation:
To minimize DB system downtime caused by automatic maintenance operations, you should enable high availability. High availability ensures that there are multiple instances of your database running in different fault domains or availability domains, reducing the impact of maintenance on the system's availability.
NEW QUESTION # 49
A port-forwarding Bastion session has been created for a MySQL DB system listening on 10.10.1.187:3306.
The SSH command provided by the Bastion session is:
An SSH tunnel is created successfully on a client machine by running this command:
Which command connects to the MySQL DB System from the client machine?
- A. mysqlsh mysql://[email protected]:3306
- B. mysqlsh mysql://[email protected]:3311
- C. mysqlsh mysql://[email protected]:3306
- D. mysqlsh mysql://[email protected]:3311
Answer: B
Explanation:
Given the SSH command sets up port forwarding from the local port3311to the remote MySQL DB system port3306, the correct command to connect to the MySQL DB system from the client machine is:
C:mysqlsh mysql://[email protected]:3311
This command connects to the local machine's port3311, which forwards the connection to the MySQL DB system at10.10.1.187:3306.
NEW QUESTION # 50
You want to migrate an on-premises MySQL database to a MySQL DB system on OCI.
Which method provides the least amount of application down time when switching to the DB system?
- A. Store the exported data in object storage to speed up the export and import.
- B. Run MySQL Shell on an OCI compute instance to export and import the data for faster migration.
- C. Use inbound replication to synchronize the MySQL database transactions to the DB system.
- D. Use the largest DB system shape to speed up the import.
Answer: C
Explanation:
To migrate an on-premises MySQL database to a MySQL DB system on OCI with the least amount of application downtime,use inbound replication to synchronize the MySQL database transactions to the DB system(Answer C).
* Inbound Replication: This method involves setting up replication from your on-premises MySQL database to the MySQL DB system in OCI. This ensures that all changes and transactions are continuously replicated, keeping the DB system up to date with minimal downtime.
* Steps to Implement:
* Set up the MySQL DB system in OCI.
* Configure the on-premises MySQL database as the master and the OCI DB system as the slave.
* Start the replication process to keep the DB system synchronized with the on-premises database.
* When ready, switch the application to the DB system with minimal downtime as the data is already synchronized.
References:
* MySQL Replication Documentation
* OCI MySQL Database Service Replication
NEW QUESTION # 51
The first query has an estimated cost of 100,000,000 and is offloaded to a HeatWave cluster for execution:
SELECT flightno, departure, country FROM flight JOIN airport_geo ON 'from'=airport_id; The second query has an estimated cost of 10,000 and is NOT offloaded to the Heatwave cluster for execution:
SELECT DISTINCT country FROM airport_geo ORDER BY country;
Which two methods can offload the second query to the Heatwave cluster for execution? (Choose two.)
- A. CALL sys.heatwave_advisor(JSON_OBJECT("auto_enc", JSON_OBJECT("mode", "recommend")));
- B. SET use_secondary_engine=FORCED;
- C. CALL sys.heatwave_load('["airport_geo"]');
- D. SET optimizer_trace="enabled=on";
- E. SET secondary_engine_cost_threshold=1000;
Answer: B,E
Explanation:
To offload the second query to the HeatWave cluster for execution, you can use the following methods:
* SET use_secondary_engine=FORCED(Answer A): This forces the use of the HeatWave secondary engine for query execution, regardless of the estimated cost.
* SET secondary_engine_cost_threshold=1000(Answer B): This lowers the cost threshold for queries to be offloaded to the HeatWave cluster, allowing queries with lower estimated costs to be offloaded.
Steps:
* Before running the second query, executeSET use_secondary_engine=FORCED;to force the offloading of queries to HeatWave.
* Alternatively, executeSET secondary_engine_cost_threshold=1000;to adjust the cost threshold, making the second query eligible for offloading.
NEW QUESTION # 52
Which two are true about creating a Bastion service to connect to a MySQL DB system? (Choose two.)
- A. The Bastion service must have a public IP address.
- B. The Bastion CIDR block allowlist must include the IP address of the DB system.
- C. The Bastion service must be in the same VCN as the DB system.
- D. TheBastion subnet must have an ingress rule to allow stateful connections on the MvSQL DB system port number.
- E. The Bastion CIDR block allowlist must include the IP address of all valid client machines.
Answer: D,E
Explanation:
When creating a Bastion service to connect to a MySQL DB system, the following are true:
* The Bastion CIDR block allowlist must include the IP address of all valid client machines(Answer C):
This ensures that only the IP addresses specified in the allowlist can access the Bastion service, enhancing security by restricting access to known clients.
* The Bastion subnet must have an ingress rule to allow stateful connections on the MySQL DB system port number(Answer E): This allows the Bastion service to communicate with the MySQL DB system by permitting traffic through the necessary ports.
References:
* OCI Bastion Service Documentation
* Setting Up Bastion with MySQL DB System
NEW QUESTION # 53
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 must increase the DB system's storage size in multiples of 100 GB.
- C. You cannot decrease the DB system's storage size.
- D. The DB system shuts down during the resize operation.
Answer: C
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 # 54
Which three operations can be performed on a MySQL HeatWave backup? (Choose three.)
- A. Change the retention period of an active manual backup.
- B. Move an active backup to another compartment.
- C. Change the retention period of an active automatic backup.
- D. Restore an active backup to a new DB system in another region.
- E. Delete an active manual backup when point-in-time recovery is enabled on the DB system.
Answer: A,B,D
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 # 55
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 # 56
You want to create a custom configuration for the MySQL DB system in OCI Console. Which three can you set? (Choose three.)
- A. VCN
- B. Compartment
- C. Subnet
- D. Description
- E. Shape
Answer: A,B,E
Explanation:
When creating a custom configuration for the MySQL DB system in OCI Console, you can set the following:
A:Shape: This defines the compute resources (CPU, memory) allocated to the DB system. B.VCN (Virtual Cloud Network): This defines the network in which your DB system will be placed. E.Compartment: This is an OCI resource management feature that allows you to organize and isolate your cloud resources.
NEW QUESTION # 57
Automatic backup retention of a DB system is disabled. Which operation deletes all automatic backups of the DB system?
- A. Disabling point-in-time recovery
- B. Deleting the DB system
- C. Enabling point-in-time recovery
- D. Disabling delete protection
Answer: B
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 # 58
You have an inbound replication channel that replicates data from one DB system to another DB system. Both DB systems are created with the default configuration.
You encountered the following error on the target DB system:
What is the possible cause?
- A. The missingGTID set has been archived to object storage and is no longer available.
- B. The administrator has deleted the binary log files from the source DB system.
- C. The channel has been disabled for more than 2 hours.
- D. The target DB system relay log file destination is full.
Answer: B
Explanation:
The error message indicates that the source has purged required binary logs, making it impossible to replicate the missing transactions. This happens when the administrator manually deletes binary log files from the source DB system, or the binary log expiration period is too short, causing automatic purging before the replica can fetch the transactions.
NEW QUESTION # 59
You want to connect to a DB system with MySQL Shell.
DB system endpoint IP address: 10.0.1.221
Username: admin
Password: MySQL8.0
Which two commands work? (Choose two.)
- A. mysqlsh mysql://admin:[email protected]
- B. mysqlsh -host 10.0.1.221 -user admin -password MySQL8.0
- C. mysqlsh mysql://MySQL8.0:[email protected]
- D. mysqlsh -h 10.0.1.221 -u admin -p MySQL8.0
- E. mysqlsh -h10.0.1.221 -uadmin -pMySQL8.0
Answer: A,E
Explanation:
To connect to a MySQL DB system using MySQL Shell, you can use several command-line formats. Here, we will analyze the provided options:
A:mysqlsh -h 10.0.1.221 -u admin -p MySQL8.0
* Incorrect format. The password should not be directly placed after the-pflag without a space or equals sign.
B:mysqlsh mysql://MySQL8.0:[email protected]
* Incorrect format. The username should come before the password in the URL.
C:mysqlsh mysql://admin:[email protected]
* Correct format. This is a valid way to connect using a URL-like format whereadminis the username,MySQL8.0is the password, and10.0.1.221is the host.
D:mysqlsh -h10.0.1.221 -uadmin -pMySQL8.0
* Correct format. This is a valid way to connect using flags, with no spaces between the flags and their values.
E:mysqlsh -host 10.0.1.221 -user admin -password MySQL8.0
* Incorrect format. MySQL Shell uses-h,-u, and-pfor specifying host, username, and password respectively.
NEW QUESTION # 60
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