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NEW QUESTION # 38
What must you do before deleting a DB system?
- A. Disable delete protection if it is enabled.
- B. Stop the instance if it is running.
- C. Stop and remove any connected HeatWave Cluster.
- D. Take a manual backup
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 # 39
You want to create a custom configuration for the MySQL DB system in OCI Console. Which three can you set? (Choose three.)
- A. VCN
- B. Compartment
- C. Shape
- D. Description
- E. Subnet
Answer: A,B,C
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 # 40
Which is true about changing the storage size of a DB system?
- A. The DB system shuts down during the resize operation.
- B. You must increase the DB system's storage size in multiples of 100 GB.
- 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 # 41
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. User accounts containing a client host name cannot connect to the read replica load balancer.
- D. It distributes connections among read replicas.
- E. It has the same endpoint as the DB system.
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 # 42
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 4 OCPUs.
- C. It must have at least 1 TB of storage
- D. It must be a bare metal shape
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 # 43
You want to create a new DB system with data import. How do you prepare the data?
- A. Export the data into anObject Storage bucket with a MySQL Shell dump utility.
- B. Export the data into the file system with the mysqldump client utility.
- C. Export the data into the file system with a MySQL Shell dump utility
- D. Back up the database into an Object Storage bucket with MySQL Enterprise Backup.
Answer: A
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 # 44
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 ingress rule that allows stateful connections on port 3306 and 33060.
- C. Create an egress rule that allows stateless connections on port 3306 and 33060.
- D. Create an egress rule that allows stateful connections on port 3306 and 33060.
Answer: B
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 # 45
Which two are available when creating a new MySQL DB system in OCI Console? (Choose two.)
- A. Standalone server
- B. Lakehouse
- C. Read replica
- D. High availability
- E. HeatWave cluster
Answer: A,D
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 # 46
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 source DB system to perform read-only operations.
- B. Connect to the read replica load balancer to perform read-only operations.
- C. Connect to the read replica load balancer to perform read/write 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 # 47
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. Import an X.509 certificate into the OCI vault.
- C. Create an OCI secret.
- D. Create an OCI password.
- E. Create an OCI vault.
Answer: B,C,D
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 # 48
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 a NAT gateway in the VCN and configure the DB system subnet to route Internet-bound traffic to the NAT gateway.
- B. Create an Internet gateway in the VCN and configure the DB system subnet to route Internet-bound traffic to the Internet 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: A
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 # 49
What happens when you perform a switchover of a high-availability DB system with an attached HeatWave cluster?
- A. The HeatWave cluster is deleted and a new HeatWave cluster is attached to the new primary instance.
- 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 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 # 50
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. Run the shutdown command from a mysqladmin client logged in as the admin user.
- C. Use the STOP action on the DB system details page in the OCI Console.
- D. Execute the mysql db-system stop command from OCI CLI.
Answer: C,D
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 # 51
Which three must be provided when creating a channel? (Choose three.)
- A. Source connection SSL mode
- B. Source connection password
- C. Replication delay
- D. Channel name
- E. Target DB system
Answer: A,B,D
Explanation:
When creating a channel for replication in MySQL, the following must be provided:
* Channel name(Answer A): The unique identifier for the replication channel.
* Source connection SSL mode(Answer B): Specifies the SSL mode for the connection to the source server.
* Source connection password(Answer D): The password for the source server connection.
Steps:
* UseCHANGE MASTER TOcommand to set up the replication channel.
* Provide the channel name, SSL mode, and connection password as part of the configuration.
References:
* MySQL Replication Documentation
* Setting Up Replication Channels
NEW QUESTION # 52
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. Delete the channel, edit the DB system, change the configuration, and re-create the channel.
- C. Edit the DB system and change the configuration.
- D. Stop the channel, edit the DB system, change the configuration, and start the channel.
Answer: D
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 # 53
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 and change the configuration of all secondary instances, switch over to a secondary instance, andedit and change the configuration of the former primary instance.
- 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: 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 # 54
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