合格できるOracle Oracle MySQL HeatWave Implementation Associate Rel 1試験最速合格保証最近更新されたFast2test問題集！
合格できる1z0-915-1試験の67問題で最適なFast2test出題問題
Oracle 1z0-915-1 認定試験の出題範囲：
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質問 # 32
What must you do to minimize a DB system down time caused by automatic maintenance operations?
- A. Enable crash recovery.
- B. Add HeatWave cluster.
- C. Create read replicas.
- D. Enable high availability.
正解：D
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 # 33
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 allows only SSL-encrypted connections.
- B. MySQL DB system allows only connections through a proxy server.
- C. MySQL DB system cannot use the standard MySQL client libraries.
- 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 # 34
What is the benefit of creating a new DB system with data import?
- A. Consistent data with no user connection
- B. Faster backup with a first full backup
- C. Smaller storage size with better compression
- D. Faster import with minimal logging
正解：D
解説：
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.
質問 # 35
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 secondary_engine_cost_threshold=1000;
- B. SET use_secondary_engine=FORCED;
- C. SET optimizer_trace="enabled=on";
- D. CALL sys.heatwave_load('["airport_geo"]');
- E. CALL sys.heatwave_advisor(JSON_OBJECT("auto_enc", JSON_OBJECT("mode", "recommend")));
正解：A、B
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 # 36
A DB system has been deleted successfully. Which two operations are allowed on the deleted DB system?
(Choose two.)
- A. Restore the DB system from an existing manual backup.
- B. Change the storage size.
- C. View the API call logs on the Audit page.
- D. Create a manual backup.
- E. View the metrics.
正解：A、C
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 # 37
Which sequence of steps must you perform to change the configuration of a high-availability DB system?
- A. Edit the DB system and change the configuration.
- 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 and change the configuration of all secondary instances, switch over to a secondary instance, andedit and change the configuration of the former primary instance.
正解：B
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 # 38
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.
正解：D
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 # 39
You want to determine which version of MySQL is running on your DB system.
Which two SQL statements show the MySQL version? (Choose two.)
- A. SHOW STATUS LIKE 'version';
- B. SHOW VARIABLES LIKE 'version';
- C. select @@version;
- D. SELECT * FROM performance_schema.global_status WHERE VARIABLE_NAME='version';
- E. SELECT @version;
正解：B、C
解説：
To determine the version of MySQL running on your DB system, you can use the following SQL statements:
* SELECT @@version;(Answer B): This query retrieves the MySQL server version from the system variables.
* SHOW VARIABLES LIKE 'version';(Answer C): This query displays the server version along with other related version variables.
Steps:
* Connect to your MySQL DB system.
* Execute eitherSELECT @@version;orSHOW VARIABLES LIKE 'version';to retrieve the version information.
References:
* MySQL Server Version Information
* SHOW VARIABLES Syntax
質問 # 40
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 -h 10.0.1.221 -u admin -p MySQL8.0
- B. mysqlsh mysql://admin:[email protected]
- C. mysqlsh -h10.0.1.221 -uadmin -pMySQL8.0
- D. mysqlsh -host 10.0.1.221 -user admin -password MySQL8.0
- E. mysqlsh mysql://MySQL8.0:[email protected]
正解：B、C
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 # 41
Which two methods can you use to import data into a MySQL DB system by using MySQL Shell? (Choose two.)
- A. util.importTable()
- B. util.loadDump()
- C. util.dumpInstance()
- D. util.dumpSchemas()
正解：A、B
解説：
Two methods to import data into a MySQL DB system using MySQL Shell are:
A:util.importTable(): This utility imports data from a file into a table. D.util.loadDump(): This utility loads a previously dumped database or table into a MySQL DB system.
質問 # 42
You want to create a new DB system with data import. How do you prepare the data?
- A. Back up the database into an Object Storage bucket with MySQL Enterprise Backup.
- B. Export the data into the file system with the mysqldump client utility.
- C. Export the data into anObject Storage bucket with a MySQL Shell dump utility.
- D. Export the data into the file system with a MySQL Shell dump utility
正解：C
解説：
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
質問 # 43
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. Configure an OCI network load balancer to accept incoming connections on a public IP and route to the DB system private IP address.
- 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 service gateway in the VCN and configure the DB system subnet to route Internet-bound traffic to the service gateway.
- D. Create a NAT gateway in the VCN and configure the DB system subnet to route Internet-bound traffic to the NAT gateway.
正解：D
解説：
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
質問 # 44
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. A manual backup taken before the selected point in time must be available.
- B. Point-in-time recovery must be enabled before the point in time to which you want to restore.
- C. The stand-alone DB system must remain active during the restore.
- D. An automatic backup taken before the selected point in time must be available.
- E. Every user table must have a primary key.
正解：A、B、D
質問 # 45
Which three must be provided when creating a channel? (Choose three.)
- A. Replication delay
- B. Target DB system
- C. Source connection password
- D. Channel name
- E. Source connection SSL mode
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 # 46
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. You must attach the Cloud Shell session to a VCN subnet that can connect to the MySQL DB system.
- B. The VCN subnet of the Cloud Shell session must have a Service Gateway in its route table.
- C. The MySQL DB system subnet must be in the Cloud Shell tenancy home region.
- D. You must install mysql client programs in the Cloud Shell session.
- E. The VCN subnet of the Cloud Shell session must have an Internet Gateway in its route table.
正解：A、C
解説：
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.
質問 # 47
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