[Jan-2025] Oracle 1z0-915-1 Dumps - Secret To Pass in First Attempt
Oracle 1z0-915-1 Exam Dumps [2025] Practice Valid Exam Dumps Question
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NEW QUESTION # 29
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 encryption key.
- B. Create an OCI vault.
- C. Create an OCI secret.
- D. Import an X.509 certificate into the OCI vault.
- E. Create an OCI password.
Answer: C,D,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 # 30
You can perform a node estimate when adding a HeatWave cluster to a DB system in OCI Console. Which two tasks are performed by the node estimate process? (Choose two.)
- A. Generate a set of alter statements to load selected tables into the HeatWave cluster.
- B. Estimate the disk storage required for each user table.
- C. Estimate the memory required for each user table.
- D. Generate a load command to activate Auto Parallel Load.
- E. Estimate the number of OCPUs required to process selected user tables.
Answer: C,E
Explanation:
When performing a node estimate while adding a HeatWave cluster to a DB system in OCI Console, the process undertakes the following tasks:
* Estimate the number of OCPUs required to process selected user tables(Answer B): The node estimation process calculates the necessary OCPUs based on the size and complexity of the tables selected by the user. This ensures that the cluster has adequate processing power for efficient performance.
* Estimate the memory required for each user table(Answer C): This task involves determining the memory requirements for each table that will be loaded into the HeatWave cluster. This ensures that there is sufficient memory to handle the data and execute queries efficiently.
References:
* OCI Console Documentation on HeatWave
* MySQL HeatWave User Guide
NEW QUESTION # 31
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]:3311
- B. mysqlsh mysql://[email protected]:3306
- C. mysqlsh mysql://[email protected]:3311
- D. mysqlsh mysql://[email protected]:3306
Answer: A
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 # 32
Which two are true about read replica load balancer? (Choose two.)
- A. It has the same endpoint as the DB system.
- B. It distributes connections among read replicas.
- C. It is created when the DB system is first created.
- D. It distributes connections among the source DB system and all read replicas.
- E. User accounts containing a client host name cannot connect to the read replica load balancer.
Answer: B,D
Explanation:
The following are true about the read replica load balancer:
* It distributes connections among the source DB system and all read replicas(Answer B): The load balancer distributes incoming read traffic across all read replicas and the source DB system to balance the load and improve performance.
* It distributes connections among read replicas(Answer E): The load balancer ensures that read traffic is evenly distributed among all available read replicas, providing high availability and scalability for read operations.
References:
* OCI MySQL Database Service Read Replicas Documentation
NEW QUESTION # 33
What happens when you perform a switchover of a high-availability DB system with an attached HeatWave cluster?
- A. The HeatWave cluster is no longer valid; you must re-create the HeatWave cluster.
- B. The HeatWave cluster remains attached to the same DB system and the new primary instance redirects queries to that cluster.
- C. The HeatWave cluster is attached to the new primary instance.
- D. The HeatWave cluster is deleted and a new HeatWave cluster is attached to the new primary instance.
Answer: C
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 # 34
A query is not offloaded to the HeatWave cluster for execution. Which three are possible reasons? (Choose three.)
- A. A required column is excluded from the RAPID secondary engine.
- B. The user does not have privileges to access the HeatWave cluster.
- C. The use_secondary_engine session variable is OFF.
- D. The client is connected to the DB system instead of the HeatWave cluster.
- E. The query estimated cost is less than the query cost threshold.
Answer: A,C,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 # 35
What must you do to minimize a DB system down time caused by automatic maintenance operations?
- A. Enable crash recovery.
- B. Enable high availability.
- C. Add HeatWave cluster.
- D. Create read replicas.
Answer: B
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 # 36
Which two are benefits of read replicas? (Choose two.)
- A. Reduce network latency.
- B. Reduce query latency.
- C. Speed up analytical queries.
- D. Reduce down time.
- E. Scale read queries.
Answer: B,E
Explanation:
A:Reduce query latency: By distributing read queries across multiple replicas, the load on the primary instance is reduced, which can decrease query latency. D.Scale read queries: Read replicas allow scaling of read operations by providing additional instances to handle read queries, improving overall performance and throughput.
NEW QUESTION # 37
Which MySQL HeatWave AutoML routine evaluates a model?
- A. ML_TRAIN
- B. ML_EXPLAIN
- C. ML_PREDICT_TABLE
- D. ML_SCORE
- E. ML_EXPLAIN_TABLE
Answer: D
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 # 38
What is the benefit of creating a new DB system with data import?
- A. Smaller storage size with better compression
- B. Faster backup with a first full backup
- C. Faster import with minimal logging
- D. Consistent data with no user connection
Answer: C
Explanation:
Creating a new DB system with data import provides the benefit of faster import with minimal logging. This process is optimized to import large datasets efficiently and quickly, reducing the amount of logging overhead and ensuring a rapid setup of the new DB system.
NEW QUESTION # 39
You want to create a read replica on a DB system.
Which is true about the read replica?
- A. lt must have at least 64 GB of memory.
- B. It must have at least 1 TB of storage
- C. It must be a bare metal shape
- D. It must have at least 4 OCPUs.
Answer: A
Explanation:
For a read replica on a DB system,it must have at least 64 GB of memory(Answer D). This requirement ensures that the read replica has sufficient resources to handle read operations and maintain performance consistency with the primary DB system.
References:
* OCI MySQL Read Replicas Documentation
NEW QUESTION # 40
You want to replicate data from an on-premises MySQL server to a MySQL DB system. The on-premises MySQL server runs in your corporate network. The MySQL server accepts incoming connections from the Internet on a public IP endpoint.
The DB system runs in Oracle Cloud Infrastructure. The DB system endpoint is connected to a privatesubnet of a VCN.
Which network configuration is required?
- A. Configure an OCI network load balancer to accept incoming connections on a public IP and route to the DB system private IP address.
- B. Create a NAT gateway in the VCN and configure the DB system subnet to route Internet-bound traffic to the NAT gateway.
- C. Create an Internet gateway in the VCN and configure the DB system subnet to route Internet-bound traffic to the Internet gateway.
- D. Create a service gateway in the VCN and configure the DB system subnet to route Internet-bound traffic to the service gateway.
Answer: B
Explanation:
To replicate data from an on-premises MySQL server to a MySQL DB system running in Oracle Cloud Infrastructure (OCI), where the DB system is connected to a private subnet of a Virtual Cloud Network (VCN), you need to enable the DB system to communicate with the Internet securely. The correct configuration is tocreate a NAT gateway in the VCN and configure the DB system subnet to route Internet-bound traffic to the NAT gateway(Answer D).
* NAT Gateway: A Network Address Translation (NAT) gateway enables instances in a private subnet to initiate outbound traffic to the Internet, but it prevents the Internet from initiating connections to those instances.
* Route Table Configuration: You need to update the route table for the private subnet to direct traffic destined for the Internet to the NAT gateway.
Steps:
* Create a NAT gateway in the OCI Console.
* Update the route table associated with the private subnet to include a route rule that directs all Internet-bound traffic (0.0.0.0/0) to the NAT gateway.
References:
* OCI NAT Gateway Documentation
* Configuring Routing for Private Subnets
NEW QUESTION # 41
What must you do before deleting a DB system?
- A. Stop and remove any connected HeatWave Cluster.
- B. Stop the instance if it is running.
- C. Disable delete protection if it is enabled.
- D. Take a manual backup
Answer: C
Explanation:
Before deleting a DB system in Oracle Cloud Infrastructure (OCI), you mustdisable delete protection if it is enabled(Answer C). Delete protection is a feature that prevents accidental deletion of DB systems. If enabled, it must be turned off before the DB system can be deleted.
Steps:
* Navigate to the DB system in the OCI Console.
* Check if delete protection is enabled.
* If enabled, disable it by updating the DB system settings.
* Proceed with deleting the DB system.
References:
* OCI Console Documentation on DB System Management
* MySQL Database Service Documentation
NEW QUESTION # 42
Which two are true about creating a new DB system with data import? (Choose two.)
- A. The data must be created with the mysqldump client utility.
- B. The data must be stored in an Object Storage bucket in the same OCI region as the new DB system.
- C. A valid pre-authenticated request must be provided to access the data.
- D. The files containing the data must be uploaded through OCI Console on the "Create DB system" page.
- E. The data must be created with MySQL Enterprise Backup.
Answer: B,C
Explanation:
When creating a new DB system with data import, the following conditions apply:
* The data must be stored in an Object Storage bucket in the same OCI region as the new DB system(Answer C): This ensures that the data is readily accessible and can be efficiently imported into the new DB system.
* A valid pre-authenticated request must be provided to access the data(Answer D): This allows secure access to the data stored in the Object Storage bucket without needing to handle credentials directly.
References:
* OCI Object Storage Documentation
* Pre-Authenticated Requests Documentation
NEW QUESTION # 43
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 # 44
Which is true about automatic DB system version upgrades?
- A. You must specify the next version to be used before the upgrade.
- B. The DB system is upgraded to the most recent release.
- C. The DB system is never upgraded automatically.
- D. The DB system is upgraded to the next release in sequence.
Answer: D
Explanation:
Automatic DB system version upgrades in OCI are performed to the next release in sequence. This means that the system is upgraded to the next available version rather than skipping to the most recent release, ensuring a stable and tested upgrade path.
NEW QUESTION # 45
Automatic backup retention of a DB system is disabled. Which operation deletes all automatic backups of the DB system?
- A. Disabling delete protection
- B. Deleting the DB system
- C. Disabling point-in-time recovery
- D. Enabling point-in-time recovery
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 # 46
You want to determine which version of MySQL is running on your DB system.
Which two SQL statements show the MySQL version? (Choose two.)
- A. SHOW VARIABLES LIKE 'version';
- B. select @@version;
- C. SHOW STATUS LIKE 'version';
- D. SELECT @version;
- E. SELECT * FROM performance_schema.global_status WHERE VARIABLE_NAME='version';
Answer: A,B
Explanation:
To determine the version of MySQL running on your DB system, you can use the following SQL statements:
* SELECT @@version;(Answer B): This query retrieves the MySQL server version from the system variables.
* SHOW VARIABLES LIKE 'version';(Answer C): This query displays the server version along with other related version variables.
Steps:
* Connect to your MySQL DB system.
* Execute eitherSELECT @@version;orSHOW VARIABLES LIKE 'version';to retrieve the version information.
References:
* MySQL Server Version Information
* SHOW VARIABLES Syntax
NEW QUESTION # 47
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 allows only connections through a proxy server.
- C. MySQL DB system allows only SSL-encrypted connections.
- D. MySQL DB system endpoint does not have a public IP address.
Answer: D
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 # 48
The following statements execute successfully:
CALL sys.ML_TRAIN('ml_data.iris', 'class', NULL, @model);
SELECT @model;
Which three are true? (Choose three.)
- A. The statements validate the data set but do not create a model.
- B. The training data set is obtained from the ml_data table in the iris schema.
- C. The generated model handle is shown in the output.
- D. The target column is class.
- E. The statements create a classification model.
Answer: C,D,E
Explanation:
The statementsCALL sys.ML_TRAIN('ml_data.iris', 'class', NULL, @model);andSELECT @model;are used to create and retrieve a machine learning model in MySQL HeatWave AutoML. The following are true:
* The generated model handle is shown in the output(Answer B): After training the model, the handle (identifier) for the model is stored in the@modelvariable and can be retrieved with theSELECT
@model;statement.
* The statements create a classification model(Answer C): TheML_TRAINprocedure is used to create a classification model since the target column (class) indicates a classification problem.
* The target column is class(Answer E): The second argument in theML_TRAINcall specifies the target column for the machine learning model, which isclassin this case.
References:
* MySQL HeatWave AutoML Documentation
* ML_TRAIN Procedure Documentation
NEW QUESTION # 49
Which three operations can be performed on a MySQL HeatWave backup? (Choose three.)
- A. Move an active backup to another compartment.
- B. Delete an active manual backup when point-in-time recovery is enabled on the DB system.
- C. Restore an active backup to a new DB system in another region.
- D. Change the retention period of an active automatic backup.
- E. Change the retention period of an active manual backup.
Answer: A,C,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 # 50
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 different shape for the new DB system.
- C. Use a different subnet for the new DB system.
- D. Use a smaller data storage size for the new DB system.
- E. Use a different region for the new DB system.
Answer: B,C
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 # 51
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