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NEW QUESTION # 30
Which sequence of steps must you perform to change the configuration of a high-availability DB system?
- A. Disable high availability, edit the DB system, change the configuration, and enable high availability.
- B. Stop the DB system, edit the DB system, change the configuration, and start the DB system.
- 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. 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 # 31
Which two are true about MySQL HeatWave configuration resources? (Choose two.)
- A. You can view custom configuration sets with the OCI CLI oci mysql db-system get command.
- 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 set a value for any global MySQL variable in a configuration.
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 # 32
Which two are true about creating a Bastion service to connect to a MySQL DB system? (Choose two.)
- A. The Bastion service must be in the same VCN as the DB system.
- B. The Bastion CIDR block allowlist must include the IP address of all valid client machines.
- C. The Bastion service must have a public IP address.
- 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 # 33
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 disk storage required for each user table.
- B. Estimate the memory 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 number of OCPUs required to process selected user tables.
Answer: B,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 # 34
You want to create a read replica on a DB system.
Which is true about the read replica?
- A. It must be a bare metal shape
- B. It must have at least 4 OCPUs.
- C. lt must have at least 64 GB of memory.
- D. It must have at least 1 TB of storage
Answer: C
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 # 35
Which is true about exporting data to Object Storage with MySQL Shell util.dumpInstance?
- A. You must specify ociParManifest: true.
- B. You must provide an OCI username and password to gain write access to Object Storage.
- C. You must specify ocimds: true.
- D. You must have a valid OCI CLI configuration.
Answer: A
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 # 36
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/write operations.
- C. Connect to the read replica load balancer to perform read-only operations.
- D. Connect to a specific read replica to perform read-only operations.
Answer: C
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 # 37
Which operation is necessary before enabling a MySQL HeatWave cluster?
- A. Create all the schemas and tables in the DB system but do not load the data.
- 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 a DB system with a HeatWave shape.
Answer: D
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 # 38
What happens when you perform a switchover of a high-availability DB system with an attached HeatWave cluster?
- A. The HeatWave cluster is attached to the new primary instance.
- B. The HeatWave cluster is no longer valid; you must re-create the HeatWave cluster.
- C. The HeatWave cluster is deleted and a new HeatWave cluster is attached to the new primary instance.
- D. The HeatWave cluster remains attached to the same DB system and the new primary instance redirects queries to that cluster.
Answer: A
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 # 39
A query is not offloaded to the HeatWave cluster for execution. Which three are possible reasons? (Choose three.)
- A. The use_secondary_engine session variable is OFF.
- B. The client is connected to the DB system instead of the HeatWave cluster.
- C. The query estimated cost is less than the query cost threshold.
- D. The user does not have privileges to access the HeatWave cluster.
- E. A required column is excluded from the RAPID secondary engine.
Answer: A,B,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 # 40
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-FD1; Secondary instance 1: AD1-FD2; Secondary instance 2: AD1-FD3
- B. Primary instance: AD1-FD3; 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: AD2-FD2; Secondary instance 2: AD3-FD3
Answer: B
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 # 41
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 OCI secret.
- B. Create an encryption key.
- C. Create an OCI vault.
- D. Import an X.509 certificate into the OCI vault.
- E. Create an OCI password.
Answer: A,D,E
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 # 42
Which two are true about creating a new DB system with data import? (Choose two.)
- A. A valid pre-authenticated request must be provided to access the data.
- B. The files containing the data must be uploaded through OCI Console on the "Create DB system" page.
- C. The data must be created with MySQL Enterprise Backup.
- D. The data must be stored in an Object Storage bucket in the same OCI region as the new DB system.
- E. The data must be created with the mysqldump client utility.
Answer: A,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 # 43
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 region for the new DB system.
- D. Use a smaller data storage size for the new DB system.
- E. Use a different subnet 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 # 44
You want to enable high availability of a stand-alone DB system. Which two conditions are required? (Choose two.)
- A. The DB system point-in-time recovery must be enabled.
- B. The DB system delete protection must be enabled.
- C. The DB system must be active.
- D. The DB system automatic backup must be enabled.
- E. The DB system crash recovery must be enabled.
Answer: C,D
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 # 45
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