Start your 1z0-915-1 Exam Questions Preparation with Updated 67 Questions [Q29-Q50]

Start your 1z0-915-1 Exam Questions Preparation with Updated 67 Questions

A Fully Updated 2024 1z0-915-1 Exam Dumps - PDF Questions and Testing Engine

NEW QUESTION # 29
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 # 30
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 set a value for any global MySQL variable in a configuration.
• D. You can view custom configuration sets with the OCI CLI oci mysql db-system get command.

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 # 31
Which is true about dynamic variables in MySQL HeatWave configurations?

• A. All user variables are dynamic.
• B. Initialization variables are not dynamic.
• C. Changes in dynamic variables require a server restart.
• 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 # 32
Which is true about changing the storage size of a DB system?

• A. You must increase the DB system's storage size in multiples of 100 GB.
• B. The DB system shuts down during the resize operation.
• C. You must stop the DB system before changing its storage size.
• 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 # 33
You want to change the configuration of an active stand-alone DB system. The DB system is configured as the target of a channel, and the channel is currently active.
Which sequence of steps must you perform?

• A. Stop the DB system, edit the DB system, change the configuration, and start the DB system.
• B. Stop the channel, edit the DB system, change the configuration, and start the channel.
• C. Delete the channel, edit the DB system, change the configuration, and re-create the channel.
• D. Edit the DB system and change the configuration.

Answer: B

Explanation:
To change the configuration of an active stand-alone DB system that is configured as the target of a channel, and the channel is currently active, you must:
D:Stop the channel, edit the DB system, change the configuration, and start the channel: This sequence ensures that no data inconsistency or replication issues occur while the configuration changes are being applied.

NEW QUESTION # 34
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 all valid client machines.
• 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 the DB system.

Answer: B,D

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 # 35
You want to enable high availability of a stand-alone DB system. Which two conditions are required? (Choose two.)

• A. The DB system delete protection must be enabled.
• B. The DB system must be active.
• C. The DB system crash recovery must be enabled.
• D. The DB system point-in-time recovery must be enabled.
• E. The DB system automatic backup must be enabled.

Answer: B,E

Explanation:
To enable high availability for a stand-alone DB system, the following conditions are required:
* The DB system must be active(Answer D): The DB system needs to be in an active state to enable high availability features.
* The DB system automatic backup must be enabled(Answer E): Automatic backups must be enabled to ensure data protection and facilitate failover operations.
Steps:
* Ensure the DB system is running and operational.
* Enable automatic backups through the OCI Console or API.
References:
* MySQL High Availability Documentation
* Automatic Backups Documentation

NEW QUESTION # 36
Which operation is necessary before enabling a MySQL HeatWave cluster?

• A. Offload the data to object storage to facilitate reloading into the cluster.
• B. Create a DB system with a HeatWave shape.
• 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: B

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 # 37
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 # 38
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. Compartment
• C. Subnet
• D. VCN
• E. Shape

Answer: B,D,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 # 39
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 -host 10.0.1.221 -user admin -password MySQL8.0
• B. mysqlsh mysql://admin:[email protected]
• C. mysqlsh mysql://MySQL8.0:[email protected]
• D. mysqlsh -h10.0.1.221 -uadmin -pMySQL8.0
• E. mysqlsh -h 10.0.1.221 -u admin -p MySQL8.0

Answer: B,D

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 # 40
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 # 41
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 # 42
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 # 43
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. The MySQL DB system subnet must be in the Cloud Shell tenancy home region.
• B. You must install mysql client programs in the Cloud Shell session.
• 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: A,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 # 44
Which is true about exporting data to Object Storage with MySQL Shell util.dumpInstance?

• A. You must provide an OCI username and password to gain write access to Object Storage.
• B. You must specify ocimds: true.
• C. You must have a valid OCI CLI configuration.
• 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 # 45
Which sequence of steps must you perform to change the configuration of a high-availability DB system?

• A. 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.
• B. Stop the DB system, edit the DB system, change the configuration, and start the DB system.
• C. Disable high availability, edit the DB system, change the configuration, and enable high availability.
• D. Edit the DB system and change the configuration.

Answer: B

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 # 46
You create a MySQL DB system with default port numbers, and attach it to a subnet.
Which configuration is required on the subnet to enable client applications to connect to the DB system?

• A. Create an ingress rule that allows stateless connections on port 3306 and 33060.
• B. Create an egress rule that allows stateless connections on port 3306 and 33060.
• C. Create an ingress rule that allows stateful connections on port 3306 and 33060.
• D. Create an egress rule that allows stateful connections on port 3306 and 33060.

Answer: C

Explanation:
To enable client applications to connect to a MySQL DB system that uses default port numbers and is attached to a subnet, you need tocreate an ingress rule that allows stateful connections on port 3306 and 33060(Answer C).
* Ingress Rule: An ingress rule specifies the types of inbound connections that are allowed to a resource within a subnet.
* Stateful Connections: Stateful connections keep track of the state of network connections passing through them, allowing return traffic to pass automatically.
Steps:
* Navigate to the Virtual Cloud Network (VCN) in the OCI Console.
* Open the subnet to which the MySQL DB system is attached.
* Add an ingress rule to the subnet's security list to allow traffic on port 3306 (MySQL) and 33060 (MySQL X Protocol).
* Ensure the rule is stateful to maintain the connection state.
References:
* OCI Networking Documentation
* MySQL X Protocol Documentation

NEW QUESTION # 47
The following statements are executed successfully:

Which two are true? (Choose two.)

• A. Every row in the airport table has a unique airport_id value.
• B. The fields in the airport.tbl file are delimited by comma.
• C. The airport.tbl file is in CSV format.
• D. The data of the airport table is loaded into the MySQL DB system.
• E. The data placement key of the airport table is airport_id.

Answer: D,E

Explanation:
Based on the provided SQL statements, the following two are true:
* The data placement key of the airport table is airport_id(Answer A): The primary keyairport_idis used as the data placement key in theairporttable. This means that the data in the table is organized based on theairport_idvalues.
* The data of the airport table is loaded into the MySQL DB system(Answer D): TheALTER TABLE airport SECONDARY_LOAD;statement successfully loads the data from the specified object storage file into the MySQL DB system.
References:
* MySQL HeatWave Documentation
* MySQL Engine Attributes

NEW QUESTION # 48
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 # 49
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 public AD-specific subnet
• B. A public regional subnet
• C. A private AD-specific subnet
• D. A private regional subnet

Answer: B,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 # 50
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