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質問 # 32
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. Import an X.509 certificate into the OCI vault.
- B. Create an OCI password.
- C. Create an encryption key.
- D. Create an OCI secret.
- E. Create an OCI vault.
正解：A、B、D
解説：
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
質問 # 33
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.mML_TRAIN('ml_data.sales', 'Sales', JSON_OBJECT('task', 'forecasting'), @model);
- C. CALL sys.ML_TRAIN('ml_data.sales', 'Sales', JSON_OBJECT('task', 'regression'), @model);
- D. CALL sys.ML_TRAIN('ml_data.sales', 'Sales', JSON_OBJECT('task', 'classification'), @model);
正解：C
解説：
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.
質問 # 34
Which MySQL HeatWave AutoML routine evaluates a model?
- A. ML_SCORE
- B. ML_EXPLAIN_TABLE
- C. ML_EXPLAIN
- D. ML_PREDICT_TABLE
- E. ML_TRAIN
正解：A
解説：
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.
質問 # 35
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 missingGTID set has been archived to object storage and is no longer available.
- B. The administrator has deleted the binary log files from the source DB system.
- C. The target DB system relay log file destination is full.
- D. The channel has been disabled for more than 2 hours.
正解：B
解説：
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.
質問 # 36
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.
正解：A
解説：
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.
質問 # 37
Which feature do you use to copy transactions from an on-premises MySQL instance to a DB system?
- A. HeatWave cluster
- B. Read replica
- C. Inbound replication
- D. Outbound replication
正解：C
解説：
To copy transactions from an on-premises MySQL instance to a DB system, you useinbound replication(Answer B).
* Inbound Replication: This feature allows the MySQL DB system to receive and apply changes (transactions) from an external MySQL instance.
* Replication Configuration: You need to set up replication between the on-premises MySQL instance and the MySQL DB system by configuring the master (on-premises) and the slave (DB system) appropriately.
References:
* MySQL Replication Documentation
* OCI MySQL Database Service Documentation
質問 # 38
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 read replica load balancer to perform read/write operations.
- B. Connect to the read replica load balancer to perform read-only operations.
- C. Connect to a specific read replica to perform read-only operations.
- D. Connect to the source DB system to perform read-only operations.
正解：B
解説：
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.
質問 # 39
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 stores the exported files in OCI Object Storage.
- C. It returns an error if the database has any incompatibilities with MySQL HeatWave.
- D. It enables all MySQL HeatWave compatibility options.
正解：B
解説：
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.
質問 # 40
Which three operations can be performed on a MySQL HeatWave backup? (Choose three.)
- A. Restore an active backup to a new DB system in another region.
- B. Move an active backup to another compartment.
- C. Delete an active manual backup when point-in-time recovery is enabled on the DB system.
- D. Change the retention period of an active automatic backup.
- E. Change the retention period of an active manual backup.
正解：A、B、E
解説：
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.
質問 # 41
How can you determine the uptime of a DB system?
- A. By executing mysql db-system get --db-system-id with OCI CLI
- B. By querying performance_schema.global_status from a connected MySQL client
- C. By using the Audit section in Logging information in the OCI Web console
- D. By checking the DB system details in the OCI Web console
正解：D
解説：
You can determine the uptime of a DB system bychecking the DB system details in the OCI Web console(Answer B). The console provides information on the system status, including the uptime since the last start.
Steps:
* Log in to the OCI Web console.
* Navigate to the MySQL DB system.
* View the details page of the DB system, where the uptime information is displayed.
References:
* OCI Console Documentation
* Monitoring DB System Uptime
質問 # 42
Automatic backup retention of a DB system is disabled. Which operation deletes all automatic backups of the DB system?
- A. Deleting the DB system
- B. Disabling delete protection
- C. Disabling point-in-time recovery
- D. Enabling point-in-time recovery
正解：A
解説：
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
質問 # 43
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. Point-in-time recovery must be enabled before the point in time to which you want to restore.
- E. A manual backup taken before the selected point in time must be available.
正解：B、D、E
質問 # 44
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. SET optimizer_trace="enabled=on";
- B. SET use_secondary_engine=FORCED;
- C. CALL sys.heatwave_advisor(JSON_OBJECT("auto_enc", JSON_OBJECT("mode", "recommend")));
- D. SET secondary_engine_cost_threshold=1000;
- E. CALL sys.heatwave_load('["airport_geo"]');
正解：B、D
解説：
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.
質問 # 45
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 mysql://MySQL8.0:[email protected]
- B. mysqlsh -h 10.0.1.221 -u admin -p MySQL8.0
- C. mysqlsh -host 10.0.1.221 -user admin -password MySQL8.0
- D. mysqlsh -h10.0.1.221 -uadmin -pMySQL8.0
- E. mysqlsh mysql://admin:[email protected]
正解：D、E
解説：
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.
質問 # 46
A DB system has been deleted successfully. Which two operations are allowed on the deleted DB system?
(Choose two.)
- A. Create a manual backup.
- B. View the metrics.
- C. Change the storage size.
- D. View the API call logs on the Audit page.
- E. Restore the DB system from an existing manual backup.
正解：D、E
解説：
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
質問 # 47
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]:3306
- C. mysqlsh mysql://[email protected]:3311
- D. mysqlsh mysql://[email protected]:3311
正解：C
解説：
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.
質問 # 48
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 channel, edit the DB system, change the configuration, and start the channel.
- B. Stop the DB system, edit the DB system, change the configuration, and start the DB system.
- C. Edit the DB system and change the configuration.
- D. Delete the channel, edit the DB system, change the configuration, and re-create the channel.
正解：A
解説：
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.
質問 # 49
Which operation is necessary before enabling a MySQL HeatWave cluster?
- A. Start Cloud Shell in OCI Console connected to the DB system's network.
- B. Create all the schemas and tables in the DB system but do not load the data.
- C. Create a DB system with a HeatWave shape.
- D. Offload the data to object storage to facilitate reloading into the cluster.
正解：C
解説：
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
質問 # 50
Which two are true about data loaded into a MySQL HeatWave cluster? (Choose two.)
- A. Data is stored locally in each cluster node's solid state disks (SSD) to increase I/O performance.
- B. Data is partitioned across cluster nodes for scalability.
- C. Data is stored in hybrid columnar format to speed up analytic queries.
- D. Data rows are sorted on the primary key to speed up range search.
- E. Data is replicated across cluster nodes for high availability.
正解：B、C
解説：
Data loaded into a MySQL HeatWave cluster:
B:Data is partitioned across cluster nodes for scalability: This allows the system to distribute the workload and handle large datasets efficiently. D.Data is stored in hybrid columnarformat to speed up analytic queries: The hybrid columnar format optimizes storage and speeds up query performance, especially for analytic workloads.
質問 # 51
You have successfully provisioned a MySQL DB system on Oracle Cloud Infrastructure by using OCI Console. You have installed the standard MySQL client libraries and MySQL Shell on your workstation that is not connected to any VPN, FastConnect, or SSH tunnel.
You CANNOT connect directly to the DB system endpoint from your workstation connected to the Internet.
What is the reason?
- A. MySQL DB system cannot use the standard MySQL client libraries.
- B. MySQL DB system allows only connections through a proxy server.
- C. MySQL DB system allows only SSL-encrypted connections.
- D. MySQL DB system endpoint does not have a public IP address.
正解：D
解説：
If you cannot connect directly to the MySQL DB system endpoint from your workstation connected to the Internet, the reason is thatMySQL DB system endpoint does not have a public IP address(Answer B).
* Private Subnet: The MySQL DB system is provisioned in a private subnet, which means it is not directly accessible from the Internet.
* Network Accessibility: To access the DB system, you need to establish a secure connection via a VPN, FastConnect, or SSH tunnel.
References:
* Connecting to a MySQL DB System
* OCI Networking Documentation
質問 # 52
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. You cannot decrease the DB system's storage size.
- C. You must stop the DB system before changing its storage size.
- D. The DB system shuts down during the resize operation.
正解：B
解説：
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
質問 # 53
Which three must be provided when creating a channel? (Choose three.)
- A. Replication delay
- B. Target DB system
- C. Source connection password
- D. Source connection SSL mode
- E. Channel name
正解：C、D、E
解説：
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
質問 # 54
What must you do to minimize a DB system down time caused by automatic maintenance operations?
- A. Enable high availability.
- B. Create read replicas.
- C. Enable crash recovery.
- D. Add HeatWave cluster.
正解：A
解説：
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.
質問 # 55
You want to create a custom configuration for the MySQL DB system in OCI Console. Which three can you set? (Choose three.)
- A. Compartment
- B. VCN
- C. Description
- D. Shape
- E. Subnet
正解：A、B、D
解説：
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.
質問 # 56
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