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NEW QUESTION # 16
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 stateful connections on port 3306 and 33060.
- B. Create an egress rule that allows stateful connections on port 3306 and 33060.
- C. Create an ingress rule that allows stateless connections on port 3306 and 33060.
- D. Create an egress rule that allows stateless connections on port 3306 and 33060.
Answer: A
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 # 17
You want to restore a stand-alone DB system to a high-availability DB system with a point-in-time recovery.
Which three are required? (Choose three.)
- A. Every user table must have a primary key.
- B. An automatic backup taken before the selected point in time must be available.
- C. The stand-alone DB system must remain active during the restore.
- D. A manual backup taken before the selected point in time must be available.
- E. Point-in-time recovery must be enabled before the point in time to which you want to restore.
Answer: B,D,E
NEW QUESTION # 18
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 tenancy for the new DB system.
- C. Use a different region for the new DB system.
- D. Use a different subnet for the new DB system.
- E. Use a different shape for the new DB system.
Answer: D,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 # 19
You have an inbound replication channel that replicates data from one DB system to another DB system. Both DB systems are created with the default configuration.
You encountered the following error on the target DB system:
What is the possible cause?
- A. The target DB system relay log file destination is full.
- B. The administrator has deleted the binary log files from the source DB system.
- C. The missingGTID set has been archived to object storage and is no longer available.
- D. The channel has been disabled for more than 2 hours.
Answer: B
Explanation:
The error message indicates that the source has purged required binary logs, making it impossible to replicate the missing transactions. This happens when the administrator manually deletes binary log files from the source DB system, or the binary log expiration period is too short, causing automatic purging before the replica can fetch the transactions.
NEW QUESTION # 20
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 no longer valid; you must re-create the HeatWave cluster.
- C. The HeatWave cluster is attached to the new primary instance.
- D. The HeatWave cluster is deleted and a new HeatWave cluster is attached to the new primary instance.
Answer: C
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 # 21
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 target column is class.
- B. The generated model handle is shown in the output.
- C. The statements create a classification model.
- D. The training data set is obtained from the ml_data table in the iris schema.
- E. The statements validate the data set but do not create a model.
Answer: A,B,C
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 # 22
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]:3306
- D. mysqlsh mysql://[email protected]:3311
Answer: D
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 # 23
What must you do before deleting a DB system?
- A. Stop and remove any connected HeatWave Cluster.
- B. Take a manual backup
- C. Stop the instance if it is running.
- 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 # 24
A DB system has been deleted successfully. Which two operations are allowed on the deleted DB system?
(Choose two.)
- A. View the API call logs on the Audit page.
- B. Change the storage size.
- C. Restore the DB system from an existing manual backup.
- D. View the metrics.
- E. Create a manual backup.
Answer: A,C
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 # 25
Automatic backup retention of a DB system is disabled. Which operation deletes all automatic backups of the DB system?
- A. Disabling delete protection
- B. Disabling point-in-time recovery
- C. Deleting the DB system
- D. Enabling point-in-time recovery
Answer: C
Explanation:
When automatic backup retention of a DB system is disabled,deleting the DB system(Answer C) will delete all automatic backups of the DB system.
* Automatic Backups: These are backups created automatically by the OCI service to ensure data protection.
* Backup Deletion: If automatic backups are disabled and you delete the DB system, all associated automatic backups are also deleted. This operation is irreversible, and you should ensure that necessary backups are taken before deleting the DB system.
References:
* OCI MySQL Database Service Backup and Restore
NEW QUESTION # 26
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. The VCN subnet of the Cloud Shell session must have an Internet Gateway in its route table.
- C. The VCN subnet of the Cloud Shell session must have a Service Gateway in its route table.
- D. You must install mysql client programs in the Cloud Shell session.
- E. You must attach the Cloud Shell session to a VCN subnet that can connect to the MySQL DB system.
Answer: A,E
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 # 27
Automatic backup retention of a DB system is disabled. Which operation deletes all automatic backups of the DB system?
- A. Disabling delete protection
- B. Disabling point-in-time recovery
- C. Deleting the DB system
- D. Enabling point-in-time recovery
Answer: C
Explanation:
When automatic backup retention of a DB system is disabled,deleting the DB system(Answer C) will delete all automatic backups of the DB system.
* Automatic Backups: These are backups created automatically by the OCI service to ensure data protection.
* Backup Deletion: If automatic backups are disabled and you delete the DB system, all associated automatic backups are also deleted. This operation is irreversible, and you should ensure that necessary backups are taken before deleting the DB system.
References:
* OCI MySQL Database Service Backup and Restore
NEW QUESTION # 28
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 a specific read replica to perform read-only operations.
- B. Connect to the read replica load balancer to perform read-only operations.
- C. Connect to the source DB system to perform read-only operations.
- D. Connect to the read replica load balancer to perform read/write 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 # 29
Which three are features of MySQL AutoPilot? (Choose three.)
- A. Auto encoding
- B. Auto backup
- C. Auto provisioning
- D. Auto thread pooling
- E. AutoML
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 # 30
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', 'anomaly_detection'),
@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', 'classification'), @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 # 31
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 # 32
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 service gateway in the VCN and configure the DB system subnet to route Internet-bound traffic to the service 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. Create a NAT gateway in the VCN and configure the DB system subnet to route Internet-bound traffic to the NAT gateway.
- D. Configure an OCI network load balancer to accept incoming connections on a public IP and route to the DB system private IP address.
Answer: C
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 # 33
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. The DB system is upgraded to the most recent release.
- D. You must specify the next version to be used before the upgrade.
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 # 34
The first query has an estimated cost of 100,000,000 and is offloaded to a HeatWave cluster for execution:
SELECT flightno, departure, country FROM flight JOIN airport_geo ON 'from'=airport_id; The second query has an estimated cost of 10,000 and is NOT offloaded to the Heatwave cluster for execution:
SELECT DISTINCT country FROM airport_geo ORDER BY country;
Which two methods can offload the second query to the Heatwave cluster for execution? (Choose two.)
- A. CALL sys.heatwave_load('["airport_geo"]');
- B. CALL sys.heatwave_advisor(JSON_OBJECT("auto_enc", JSON_OBJECT("mode", "recommend")));
- C. SET optimizer_trace="enabled=on";
- D. SET use_secondary_engine=FORCED;
- E. SET secondary_engine_cost_threshold=1000;
Answer: D,E
Explanation:
To offload the second query to the HeatWave cluster for execution, you can use the following methods:
* SET use_secondary_engine=FORCED(Answer A): This forces the use of the HeatWave secondary engine for query execution, regardless of the estimated cost.
* SET secondary_engine_cost_threshold=1000(Answer B): This lowers the cost threshold for queries to be offloaded to the HeatWave cluster, allowing queries with lower estimated costs to be offloaded.
Steps:
* Before running the second query, executeSET use_secondary_engine=FORCED;to force the offloading of queries to HeatWave.
* Alternatively, executeSET secondary_engine_cost_threshold=1000;to adjust the cost threshold, making the second query eligible for offloading.
NEW QUESTION # 35
Why would you select "Source cannot use GTID auto-positioning" when creating a channel?
- A. The target DB system is a high-availability DB system.
- B. Some tables have no primary key
- C. The binary log offset is unknown.
- D. The source gtid mode is OFF.
Answer: D
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 # 36
Which three operations can be performed on a MySQL HeatWave backup? (Choose three.)
- A. Delete an active manual backup when point-in-time recovery is enabled on the DB system.
- B. Change the retention period of an active manual backup.
- C. Change the retention period of an active automatic backup.
- D. Restore an active backup to a new DB system in another region.
- E. Move an active backup to another compartment.
Answer: B,D,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 # 37
What is the benefit of creating a new DB system with data import?
- A. Smaller storage size with better compression
- B. Faster import with minimal logging
- C. Faster backup with a first full backup
- D. Consistent data with no user connection
Answer: B
Explanation:
Creating a new DB system with data import provides the benefit of faster import with minimal logging. This process is optimized to import large datasets efficiently and quickly, reducing the amount of logging overhead and ensuring a rapid setup of the new DB system.
NEW QUESTION # 38
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 point-in-time recovery must be enabled.
- C. The DB system crash recovery must be enabled.
- D. The DB system automatic backup must be enabled.
- E. The DB system must be active.
Answer: D,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 # 39
The following statements are executed successfully:
Which two are true? (Choose two.)
- A. The airport.tbl file is in CSV format.
- B. The fields in the airport.tbl file are delimited by comma.
- C. The data of the airport table is loaded into the MySQL DB system.
- D. The data placement key of the airport table is airport_id.
- E. Every row in the airport table has a unique airport_id value.
Answer: C,D
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 # 40
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