Prepare For Realistic 1z0-915-1 Dumps PDF - 100% Passing Guarantee
Check the Available 1z0-915-1 Exam Dumps with 67 Q's
Oracle 1z0-915-1 Exam Syllabus Topics:
| Topic | Details |
|---|---|
| Topic 1 |
|
| Topic 2 |
|
| Topic 3 |
|
| Topic 4 |
|
| Topic 5 |
|
| Topic 6 |
|
| Topic 7 |
|
NEW QUESTION # 18
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 read replica load balancer to perform read/write operations.
- B. Connect to the read replica load balancer to perform read-only operations.
- C. Connect to the source DB system to perform read-only operations.
- D. Connect to a specific read replica to perform read-only operations.
Answer: B
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 # 19
Which placement is NOT valid for a high-availability DB system? (Note: AD refers to availability domain and FD refers to fault domain.)
- A. Primary instance: AD1-FD3; Secondary instance 1: AD2-FD2; Secondary instance 2: AD3-FD3
- B. Primary instance: AD1-FD1; Secondary instance 1: AD1-FD2; Secondary instance 2: AD1-FD3
- C. Primary instance: AD1-FD1; Secondary instance 1: AD2-FD2; Secondary instance 2: AD3-FD3
- D. Primary instance: AD1-FD3; Secondary instance 1: AD1-FD2; Secondary instance 2: AD1-FD3
Answer: D
Explanation:
In a high-availability DB system, the placement of primary and secondary instances should ensure redundancy across different availability domains (ADs) and fault domains (FDs) to minimize downtime and data loss. The placement mentioned in option D is not valid because itplaces the primary and secondary instances in the same availability domain and fault domain, which does not provide high availability.
NEW QUESTION # 20
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 statements create a classification model.
- C. The target column is class.
- D. The generated model handle is shown in the output.
- E. The training data set is obtained from the ml_data table in the iris schema.
Answer: B,C,D
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 # 21
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 subnet for the new DB system.
- B. Use a different region for the new DB system.
- C. Use a different shape for the new DB system.
- D. Use a smaller data storage size for the new DB system.
- E. Use a different tenancy for the new DB system.
Answer: A,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 # 22
You want to import data into a DB system with MySQL Shell util.loadDump().
Which option can speed up the load?
- A. showMetadata: false
- B. updateGtidSet: off
- C. skipBinlog: true
- D. deferTableIndexes: all
Answer: D
Explanation:
To speed up the data load into a DB system usingMySQL Shell util.loadDump(), you can use the deferTableIndexes: alloption (Answer D). This option defers the creation of indexes until after the data has been loaded, which can significantly improve the speed of the loading process.
Steps:
* Export your data using MySQL Shell dump utility.
* Useutil.loadDump()to import the data and specify thedeferTableIndexes: alloption.
* The data is loaded without building indexes initially, reducing the time required for the import.
* After the data load is complete, indexes are created in a batch process, which is more efficient than creating them during the data load.
References:
* MySQL Shell Dump & Load Documentation
NEW QUESTION # 23
Which is true about dynamic variables in MySQL HeatWave configurations?
- A. All user variables are dynamic.
- B. Changes in dynamic variables require a server restart.
- C. Initialization variables are not dynamic.
- D. Dynamic variables in a custom configuration can be changed without copying the configuration to a new configuration.
Answer: D
Explanation:
In MySQL HeatWave configurations, dynamic variables can be changed without requiring the configuration to be copied to a new configuration. This allows for more flexible and immediate adjustments to system settings without the need for a server restart or creating a new configuration instance.
NEW QUESTION # 24
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 # 25
What must be enabled for using the point-in-time recovery feature in a DB system?
- A. Automatic backups
- B. Delete protection
- C. HeatWave cluster
- D. High availability
Answer: A
Explanation:
To use the point-in-time recovery feature in a DB system,automatic backupsmust be enabled (Answer B).
* Point-in-Time Recovery: This feature allows you to restore your database to a specific point in time, which is crucial for recovering from accidental data loss or corruption.
* Automatic Backups: These provide the necessary backup data that can be used to restore the database to the desired point in time.
References:
* OCI MySQL Database Service Point-in-Time Recovery
* Automatic Backups Documentation
NEW QUESTION # 26
You want to migrate an on-premises MySQL database to MySQL HeatWave by exporting the MySQL database with MySQL Shell util.dumpInstance.
What is the purpose of the ocimds: true option?
- A. It stores the exported files in OCI Object Storage.
- B. It returns an error if the database has any incompatibilities with MySQL HeatWave.
- C. It launches a new DB system and imports the data concurrently with the export operation.
- D. It enables all MySQL HeatWave compatibility options.
Answer: A
Explanation:
The purpose of theocimds: trueoption in theutil.dumpInstancecommand is to:
D:It stores the exported files in OCI Object Storage: This option ensures that the exported database files are stored directly in Oracle Cloud Infrastructure Object Storage.
NEW QUESTION # 27
You have successfully enabled high availability of a stand-alone DB system. Which is true?
- A. The DB system provides new port numbers on the same endpoint to connect to the secondary instances for read-only connections.
- B. The DB system performs load balancing by distributing client connections to all instances.
- C. The DB system provides new endpoints to connect to the secondary instances for read-only connections.
- D. The DB system has three instances running in different availability or fault domains.
Answer: D
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 # 28
A query is not offloaded to the HeatWave cluster for execution. Which three are possible reasons? (Choose three.)
- A. The user does not have privileges to access the HeatWave cluster.
- B. The use_secondary_engine session variable is OFF.
- C. A required column is excluded from the RAPID secondary engine.
- D. The query estimated cost is less than the query cost threshold.
- E. The client is connected to the DB system instead of the HeatWave cluster.
Answer: B,C,E
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 # 29
Which three operations can be performed on a MySQL HeatWave backup? (Choose three.)
- A. Restore an active backup to a new DB system in another region.
- B. Delete an active manual backup when point-in-time recovery is enabled on the DB system.
- C. Change the retention period of an active manual backup.
- D. Change the retention period of an active automatic backup.
- E. Move an active backup to another compartment.
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 # 30
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 SSL-encrypted connections.
- B. MySQL DB system cannot use the standard MySQL client libraries.
- C. MySQL DB system allows only connections through a proxy server.
- 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 # 31
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. The stand-alone DB system must remain active during the restore.
- B. An automatic backup taken before the selected point in time must be available.
- C. A manual backup taken before the selected point in time must be available.
- D. Every user table must have a primary key.
- E. Point-in-time recovery must be enabled before the point in time to which you want to restore.
Answer: B,C,E
NEW QUESTION # 32
Which is true about exporting data to Object Storage with MySQL Shell util.dumpInstance?
- A. You must specify ocimds: true.
- B. You must have a valid OCI CLI configuration.
- C. You must provide an OCI username and password to gain write access to Object Storage.
- D. You must specify ociParManifest: true.
Answer: D
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 # 33
A MySQL DB system has an endpoint in an OCI VCN subnet. The VCN is not configured with VCN peering, VPN access, and FastConnect. You want to connect to the MySQL DB system directly from an OCI Cloud Shell session.
Which two are true? (Choose two.)
- A. You must install mysql client programs in the Cloud Shell session.
- B. The MySQL DB system subnet must be in the Cloud Shell tenancy home region.
- C. The VCN subnet of the Cloud Shell session must have an Internet Gateway in its route table.
- D. You must attach the Cloud Shell session to a VCN subnet that can connect to the MySQL DB system.
- E. The VCN subnet of the Cloud Shell session must have a Service Gateway in its route table.
Answer: B,D
Explanation:
To connect to a MySQL DB system from an OCI Cloud Shell session when the VCN is not configured with VCN peering, VPN access, or FastConnect, the following must be true:
A:You must attach the Cloud Shell session to a VCN subnet that can connect to the MySQL DB system: The Cloud Shell must be in the same network or have a route to the network containing the MySQL DB system.
C:The MySQL DB system subnet must be in theCloud Shell tenancy home region: Cloud Shell sessions operate within the OCI home region, so the target MySQL DB system must be accessible from within the same region.
NEW QUESTION # 34
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. Create an Internet gateway in the VCN and configure the DB system subnet to route Internet-bound traffic to the Internet gateway.
- B. Create a NAT gateway in the VCN and configure the DB system subnet to route Internet-bound traffic to the NAT gateway.
- C. Configure an OCI network load balancer to accept incoming connections on a public IP and route to the DB system private IP address.
- 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 # 35
Which two are true about MySQL HeatWave configuration resources? (Choose two.)
- A. You can set a value for any global MySQL variable in a configuration.
- B. You can compare configurations in the same compartment in OCI console.
- C. You must copy the configuration before changing any variable values.
- D. You can view custom configuration sets with the OCI CLI oci mysql db-system get command.
Answer: A,D
Explanation:
A:You can set a value for any global MySQL variable in a configuration: MySQL HeatWave allows you to configure and set global MySQL variables to optimize performance and customize the environment as needed.
C:You can view custom configuration sets with the OCI CLIoci mysql db-system getcommand: The OCI CLI provides commands to retrieve details about MySQL DB systems, including custom configurations.
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. Check the value of the hw_data_scanned global status variable.
- B. View the Query Execution Plan of the query by running EXPLAIN.
- C. Check the value of the rapid_query_offload_count global status variable.
- D. Query the rpd_tables table in performance_schema.
Answer: C
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 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 -h10.0.1.221 -uadmin -pMySQL8.0
- C. mysqlsh mysql://MySQL8.0:[email protected]
- D. mysqlsh -host 10.0.1.221 -user admin -password MySQL8.0
- E. mysqlsh -h 10.0.1.221 -u admin -p MySQL8.0
Answer: A,B
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 # 38
You want to train a model that predicts sales based on the available data the company holds.
This is an excerpt of thesalestable:
Which command trains the model?
- A. CALL sys.mML_TRAIN('ml_data.sales', 'Sales', JSON_OBJECT('task', 'forecasting'), @model);
- B. CALL sys.ML_TRAIN('ml_data.sales', 'Sales', JSON_OBJECT('task', 'anomaly_detection'),
@model); - C. CALL sys.ML_TRAIN('ml_data.sales', 'Sales', JSON_OBJECT('task', 'regression'), @model);
- D. CALL sys.ML_TRAIN('ml_data.sales', 'Sales', JSON_OBJECT('task', 'classification'), @model);
Answer: C
Explanation:
To train a model that predicts sales, the appropriate machine learning task would be regression, as it involves predicting a continuous value (sales) based on the given data. The command to train such a model is:
D:CALL sys.ML_TRAIN('ml_data.sales', 'Sales', JSON_OBJECT('task', 'regression'), @model); This command calls theML_TRAINprocedure on theml_data.salestable, withSalesas the target variable, specifying the task as regression.
NEW QUESTION # 39
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]:3311
- C. mysqlsh mysql://[email protected]:3306
- D. mysqlsh mysql://[email protected]:3306
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 # 40
What must you do before deleting a DB system?
- A. Stop and remove any connected HeatWave Cluster.
- B. Take a manual backup
- C. Stop the instance if it is running.
- D. Disable delete protection if it is enabled.
Answer: D
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 # 41
......
Download 1z0-915-1 Exam Dumps Questions to get 100% Success: https://www.actualvce.com/Oracle/1z0-915-1-valid-vce-dumps.html