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Oracle 1z0-915-1 認定試験の出題範囲：

トピック
出題範囲

トピック 1

Data Migrations: For data migration specialists and database administrators, this part of the exam covers creating a DB system with data import, importing data into a DB system, and exporting data from MySQL servers and DB systems.

トピック 2

MySQL HeatWave Service: For database administrators, cloud architects, and DevOps engineers, this section of the exam covers identifying key features and benefits, describing MySQL HeatWave architecture, defining MySQL HeatWave terminology, and identifying MySQL HeatWave limitations.

トピック 3

MySQL HeatWave Configurations: For database administrators and performance tuning specialists, this part of the exam covers creating custom configurations, comparing configurations, describing the effects of changing dynamic and non-dynamic variables, and updating a DB system configuration.

トピック 4

Describe the architecture of the HeatWave cluster, adding a HeatWave cluster to a DB system, and determine whether a query is offloaded to HeatWave cluster for execution.

トピック 5

Read Replicas: For database architects and replication specialists, this domain of the exam covers creating and managing read replicas, describing the read replica load balancer, connecting to a read replica, etc.

トピック 6

HeatWave Cluster: For database performance specialists and cloud architects, this section of the exam covers

Oracle MySQL HeatWave Implementation Associate Rel 1 認定 1z0-915-1 試験問題 (Q14-Q19):

質問 # 14
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 deleted and a new HeatWave cluster is attached to the new primary instance.
C. The HeatWave cluster remains attached to the same DB system and the new primary instance redirects queries to that cluster.
D. The HeatWave cluster is no longer valid; you must re-create the HeatWave cluster.

正解：A

解説：
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

質問 # 15
You run this command to connect successfully to a DB system:
mysqlsh john@10.0.1.122 --auth-method=authentication_oci_client
Why does the command NOT require a password?

A. The operating system user credential is used to authenticate with the DB system.
B. The correct API key-pair is specified in the -/. oci. config file.
C. The correct password is saved in the local MySQL Shell secret store.
D. The credential is stored in an OCI vault secret.

正解：B

解説：
The commandmysqlsh john@10.0.1.122 --auth-method=authentication_oci_clientdoes not require a password because it uses the OCI (Oracle Cloud Infrastructure) client authentication method. This method relies on the correct API key-pair specified in the~/.oci/configfile. This file contains the necessary credentials (user OCID, tenancy OCID, API keys, etc.) to authenticate with the OCI environment without needing a password for each connection.

質問 # 16
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 data must be created with the mysqldump client utility.
C. The data must be stored in an Object Storage bucket in the same OCI region as the new DB system.
D. The files containing the data must be uploaded through OCI Console on the "Create DB system" page.
E. The data must be created with MySQL Enterprise Backup.

正解：A、C

解説：
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

質問 # 17
Which two are true about creating a Bastion service to connect to a MySQL DB system? (Choose two.)

A. TheBastion subnet must have an ingress rule to allow stateful connections on the MvSQL DB system port number.
B. The Bastion service must have a public IP address.
C. The Bastion CIDR block allowlist must include the IP address of the DB system.
D. The Bastion service must be in the same VCN as the DB system.
E. The Bastion CIDR block allowlist must include the IP address of all valid client machines.

正解：A、E

解説：
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

質問 # 18
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.

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 # 19
......

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