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Truly Beneficial For Your Oracle Exam (Updated 67 Questions)
Oracle 1z0-915-1 Exam Syllabus Topics:
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NEW QUESTION # 20
Which two are available when creating a new MySQL DB system in OCI Console? (Choose two.)
- A. High availability
- B. HeatWave cluster
- C. Standalone server
- D. Lakehouse
- E. Read replica
Answer: A,C
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 # 21
Which is true about automatic DB system version upgrades?
- A. The DB system is never upgraded automatically.
- B. The DB system is upgraded to the next release in sequence.
- C. You must specify the next version to be used before the upgrade.
- D. The DB system is upgraded to the most recent release.
Answer: B
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 # 22
Which is true about exporting data to Object Storage with MySQL Shell util.dumpInstance?
- A. You must have a valid OCI CLI configuration.
- 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 specify ocimds: true.
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 # 23
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 smaller data storage size for the new DB system.
- B. Use a different subnet for the new DB system.
- C. Use a different tenancy 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: B,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 # 24
Which three operations can be performed on a MySQL HeatWave backup? (Choose three.)
- A. Change the retention period of an active automatic backup.
- B. Change the retention period of an active manual backup.
- C. Move an active backup to another compartment.
- D. Delete an active manual backup when point-in-time recovery is enabled on the DB system.
- E. Restore an active backup to a new DB system in another region.
Answer: B,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 # 25
You want to train a classification model with MySQL HeatWave AutoML. Which two are requirements of the training data set? (Choose two.)
- A. The target column must be numeric.
- B. There must be at least two feature columns.
- C. The target column and all feature columns must be stored in a single table.
- D. All feature columns must be numeric.
- E. The target column must have at least two distinct values.
Answer: C,E
Explanation:
When training a classification model with MySQL HeatWave AutoML, the following requirements must be met:
* The target column and all feature columns must be stored in a single table(Answer B): All data necessary for training the model should be in one table to simplify the data processing and training pipeline.
* The target column must have at least two distinct values(Answer E): For classification tasks, the target column must have multiple distinct values to enable the model to differentiate between classes.
References:
* MySQL HeatWave AutoML Documentation
* MySQL HeatWave User Guide
NEW QUESTION # 26
Which two are true about read replica load balancer? (Choose two.)
- A. It is created when the DB system is first created.
- B. It distributes connections among the source DB system and all read replicas.
- C. It distributes connections among read replicas.
- D. User accounts containing a client host name cannot connect to the read replica load balancer.
- E. It has the same endpoint as the DB system.
Answer: B,C
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 # 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 has three instances running in different availability or fault domains.
- 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: B
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
What must you do before deleting a DB system?
- A. Stop the instance if it is running.
- B. Take a manual backup
- C. Stop and remove any connected HeatWave Cluster.
- 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 # 29
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. The DB system shuts down during the resize operation.
- C. You must increase the DB system's storage size in multiples of 100 GB.
- D. You cannot decrease the DB system's storage size.
Answer: D
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 # 30
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. View the Query Execution Plan of the query by running EXPLAIN.
- B. Check the value of the rapid_query_offload_count global status variable.
- C. Check the value of the hw_data_scanned global status variable.
- D. Query the rpd_tables table in performance_schema.
Answer: B
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 # 31
Why would you select "Source cannot use GTID auto-positioning" when creating a channel?
- A. Some tables have no primary key
- B. The source gtid mode is OFF.
- C. The binary log offset is unknown.
- D. The target DB system is a high-availability DB system.
Answer: B
Explanation:
When creating a replication channel and selecting "Source cannot use GTID auto-positioning", it typically indicates that the source's GTID mode is off. GTID (Global Transaction Identifier) auto-positioning allows for automated recovery and positioning of transactions in replication, but it requires that GTID mode be enabled on the source database.
NEW QUESTION # 32
Which two are true about creating a new DB system with data import? (Choose two.)
- A. The data must be created with MySQL Enterprise Backup.
- B. A valid pre-authenticated request must be provided to access the data.
- C. The data must be created with the mysqldump client utility.
- D. The data must be stored in an Object Storage bucket in the same OCI region as the new DB system.
- E. The files containing the data must be uploaded through OCI Console on the "Create DB system" page.
Answer: B,D
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 # 33
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 anObject Storage bucket with a MySQL Shell dump utility.
- C. Export the data into the file system with the mysqldump client utility.
- D. Back up the database into an Object Storage bucket with MySQL Enterprise Backup.
Answer: B
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 # 34
Which three are features of MySQL AutoPilot? (Choose three.)
- A. Auto provisioning
- B. Auto thread pooling
- C. AutoML
- D. Auto backup
- E. Auto encoding
Answer: A,C,E
Explanation:
The following are features of MySQL AutoPilot:
* Auto encoding(Answer C): MySQL AutoPilot automatically determines the best encoding for data to optimize storage and performance.
* Auto provisioning(Answer D): MySQL AutoPilot can automatically provision additional resources based on workload demands, ensuring optimal performance.
* AutoML(Answer E): MySQL AutoPilot includes AutoML capabilities, which automate the process of machine learning model selection, training, and deployment.
References:
* MySQL HeatWave AutoPilot Documentation
* MySQL AutoPilot Features
NEW QUESTION # 35
Which two are true about MySQL HeatWave configuration resources? (Choose two.)
- A. You must copy the configuration before changing any variable values.
- B. You can compare configurations in the same compartment in OCI console.
- C. You can view custom configuration sets with the OCI CLI oci mysql db-system get command.
- D. You can set a value for any global MySQL variable in a configuration.
Answer: C,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
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 # 37
A DB system has been deleted successfully. Which two operations are allowed on the deleted DB system?
(Choose two.)
- A. Restore the DB system from an existing manual backup.
- B. View the API call logs on the Audit page.
- C. Create a manual backup.
- D. Change the storage size.
- E. View the metrics.
Answer: A,B
Explanation:
When a DB system has been successfully deleted, the following operations are allowed:
* Restore the DB system from an existing manual backup(Answer C): Even after the DB system is deleted, you can restore it from any existing manual backups. This allows you to recover the data and configuration from a point-in-time backup.
* View the API call logs on the Audit page(Answer E): You can view the API call logs related to the deleted DB system on the Audit page. These logs provide a record of actions taken on the DB system, including the deletion event.
References:
* OCI Backup and Restore Documentation
* OCI Audit Documentation
NEW QUESTION # 38
Which MySQL HeatWave AutoML routine evaluates a model?
- A. ML_EXPLAIN_TABLE
- B. ML_EXPLAIN
- C. ML_SCORE
- D. ML_PREDICT_TABLE
- E. ML_TRAIN
Answer: C
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 # 39
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 operating system user credential is used to authenticate with the DB system.
- B. The credential is stored in an OCI vault secret.
- C. The correct password is saved in the local MySQL Shell secret store.
- 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 # 40
Which operation is necessary before enabling a MySQL HeatWave cluster?
- A. Create a DB system with a HeatWave shape.
- B. Offload the data to object storage to facilitate reloading into the cluster.
- C. Start Cloud Shell in OCI Console connected to the DB system's network.
- D. Create all the schemas and tables in the DB system but do not load the data.
Answer: A
Explanation:
Before enabling a MySQL HeatWave cluster,you must create a DB system with a HeatWave shape(Answer D). The HeatWave shape includes the necessary resources and configuration to support the HeatWave in-memory query accelerator.
Steps:
* Create a MySQL DB system in OCI Console.
* Choose a HeatWave shape during the DB system creation process.
* Once the DB system is created, you can enable and configure the HeatWave cluster.
References:
* MySQL HeatWave Documentation
NEW QUESTION # 41
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]:3311
- 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 # 42
What must you do to minimize a DB system down time caused by automatic maintenance operations?
- A. Create read replicas.
- B. Add HeatWave cluster.
- C. Enable high availability.
- D. Enable crash recovery.
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 # 43
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.ML_TRAIN('ml_data.sales', 'Sales', JSON_OBJECT('task', 'classification'), @model);
- B. CALL sys.ML_TRAIN('ml_data.sales', 'Sales', JSON_OBJECT('task', 'regression'), @model);
- C. CALL sys.ML_TRAIN('ml_data.sales', 'Sales', JSON_OBJECT('task', 'anomaly_detection'),
@model); - D. CALL sys.mML_TRAIN('ml_data.sales', 'Sales', JSON_OBJECT('task', 'forecasting'), @model);
Answer: B
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 # 44
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. Estimate the number of OCPUs required to process selected user tables.
- B. Estimate the disk storage required for each user table.
- C. Generate a load command to activate Auto Parallel Load.
- D. Generate a set of alter statements to load selected tables into the HeatWave cluster.
- E. Estimate the memory required for each user table.
Answer: A,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 # 45
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