Updated Oct-2024 1z0-915-1 Exam Practice Test Questions
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NEW QUESTION # 33
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 rapid_query_offload_count global status variable.
- C. View the Query Execution Plan of the query by running EXPLAIN.
- D. Check the value of the hw_data_scanned global status variable.
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 # 34
You run this command to connect successfully to a DB system:
mysqlsh [email protected] --auth-method=authentication_oci_client
Why does the command NOT require a password?
- A. The correct API key-pair is specified in the -/. oci. config file.
- 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 operating system user credential is used to authenticate with the DB system.
Answer: A
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 # 35
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 training data set is obtained from the ml_data table in the iris schema.
- B. The statements create a classification model.
- C. The generated model handle is shown in the output.
- D. The target column is class.
- E. The statements validate the data set but do not create a model.
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 # 36
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 distributes connections among the source DB system and all read replicas.
- D. It is created when the DB system is first created.
- E. User accounts containing a client host name cannot connect to the read replica load balancer.
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 # 37
What must you do before deleting a DB system?
- A. Disable delete protection if it is enabled.
- B. Take a manual backup
- C. Stop and remove any connected HeatWave Cluster.
- D. Stop the instance if it is running.
Answer: A
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 # 38
Which is true about dynamic variables in MySQL HeatWave configurations?
- A. Initialization variables are not dynamic.
- B. All user variables are dynamic.
- C. Dynamic variables in a custom configuration can be changed without copying the configuration to a new configuration.
- D. Changes in dynamic variables require a server restart.
Answer: C
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 # 39
Which is true about automatic DB system version upgrades?
- A. The DB system is upgraded to the most recent release.
- B. You must specify the next version to be used before the upgrade.
- C. The DB system is upgraded to the next release in sequence.
- D. The DB system is never upgraded automatically.
Answer: C
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 # 40
Which sequence of steps must you perform to change the configuration of a high-availability DB system?
- A. Stop the DB system, edit the DB system, change the configuration, and start the DB system.
- B. Edit the DB system and change the configuration.
- C. Edit and change the configuration of all secondary instances, switch over to a secondary instance, andedit and change the configuration of the former primary instance.
- D. Disable high availability, edit the DB system, change the configuration, and enable high availability.
Answer: A
Explanation:
To change the configuration of a high-availability DB system, you must follow these steps:
* Stop the DB system: This ensures that the system is in a consistent state and that no transactions are being processed during the configuration change.
* Edit the DB system: Make the necessary changes to the configuration.
* Change the configuration: Apply the configuration changes.
* Start the DB system: Restart the system to apply the new configuration settings.
NEW QUESTION # 41
You want to create a custom configuration for the MySQL DB system in OCI Console. Which three can you set? (Choose three.)
- A. Description
- B. VCN
- C. Compartment
- D. Shape
- E. Subnet
Answer: B,C,D
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 # 42
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: AD1-FD2; Secondary instance 2: AD1-FD3
- B. Primary instance: AD1-FD3; Secondary instance 1: AD2-FD2; Secondary instance 2: AD3-FD3
- C. Primary instance: AD1-FD1; Secondary instance 1: AD1-FD2; Secondary instance 2: AD1-FD3
- D. Primary instance: AD1-FD1; Secondary instance 1: AD2-FD2; Secondary instance 2: AD3-FD3
Answer: A
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 # 43
Which three are features of MySQL AutoPilot? (Choose three.)
- A. Auto provisioning
- B. Auto encoding
- C. AutoML
- D. Auto backup
- E. Auto thread pooling
Answer: A,B,C
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 # 44
What must you do to minimize a DB system down time caused by automatic maintenance operations?
- A. Enable high availability.
- B. Add HeatWave cluster.
- C. Enable crash recovery.
- D. Create read replicas.
Answer: A
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 # 45
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 launches a new DB system and imports the data concurrently with the export operation.
- B. It enables all MySQL HeatWave compatibility options.
- C. It stores the exported files in OCI Object Storage.
- D. It returns an error if the database has any incompatibilities with MySQL HeatWave.
Answer: C
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 # 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. SELECT * FROM performance_schema.global_status WHERE VARIABLE_NAME='version';
- D. SELECT @version;
- E. SHOW STATUS LIKE '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
What happens when you perform a switchover of a high-availability DB system with an attached HeatWave cluster?
- A. The HeatWave cluster remains attached to the same DB system and the new primary instance redirects queries to that cluster.
- B. The HeatWave cluster is deleted and a new HeatWave cluster is attached to the new primary instance.
- C. The HeatWave cluster is no longer valid; you must re-create the HeatWave cluster.
- D. The HeatWave cluster is attached to the new primary instance.
Answer: D
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 # 48
You want to deploy a high-availability MySQL DB system in a region with multiple availability domains.
Which two types of subnet provide maximum redundancy? (Choose two.)
- A. A private AD-specific subnet
- B. A public AD-specific subnet
- C. A public regional subnet
- D. A private regional subnet
Answer: C,D
Explanation:
To deploy a high-availability MySQL DB system in a region with multiple availability domains, the following types of subnets provide maximum redundancy:
* A private regional subnet(Answer B): This type of subnet spans all availability domains in the region, ensuring high availability and fault tolerance.
* A public regional subnet(Answer C): Similar to the private regional subnet, a public regional subnet spans all availability domains, providing maximum redundancy and accessibility.
References:
* OCI Networking Documentation
* MySQL High Availability Documentation
NEW QUESTION # 49
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 view custom configuration sets with the OCI CLI oci mysql db-system get command.
- C. You must copy the configuration before changing any variable values.
- D. You can compare configurations in the same compartment in OCI console.
Answer: A,B
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 # 50
Which MySQL HeatWave AutoML routine evaluates a model?
- A. ML_PREDICT_TABLE
- B. ML_SCORE
- C. ML_TRAIN
- D. ML_EXPLAIN_TABLE
- E. ML_EXPLAIN
Answer: B
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 # 51
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