After users purchase MySQL cloud database on HUAWEI CLOUD, which of the following items need to be managed by themselves?

• A.SQL optimization
• B.Highly available database
• C.Operating system upgrade
• D.Database software installation

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When the user uses the Huawei Cloud 0ST tool to migrate the object storage.
Which of the following situations requires resource assessment in the migration material?

• A.The data capacity in the source bucket exceeds 3T, and the number of objects exceeds 3 million.
• B.The data capacity in the source bucket exceeds 1T, and the number of objects exceeds 3 million.
• C.The data capacity in the source bucket exceeds 3T, and the number of objects exceeds 5 million.
• D.The data capacity in the source bucket exceeds 5T, and the number of objects exceeds 5 million.

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Which of the following description of RDBMS (relational database management system) are correct? (Multiple choice)

• A.RDBMS provides data consistency and concurrency control capability.
• B.The application program needs to be modified when the logical structure of RDBMS data changes.
• C.RDBMS is mainly used to manage relational databases.
• D.Oracle is an RDBMS

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If the tenant deletes the HUAWEI CLOUD 0BS bucket, all files and folders in the bucket must be emptied first.

• A.FALSE
• B.TRUE

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The health check mechanism of HUAWEI CLOUD ELB can identify whether there are unavailable ECS instances in the back-end server group. If there are, these abnormal ECS instances will not be assigned tasks until these ECS instances return to normal. However, in some special application scenarios, the health check needs to be turned off. Which of the following descriptions about turning off the health check is correct?

• A.Both the fourth and seventh floors can close the health check.
• B.The health check can be turned off for the fourth layer service, but the health check cannot be turned off for the seventh layer service.
• C.The health check can be turned off for the seventh layer service, but the health check cannot be turned off for the fourth layer service.
• D.The health check cannot be closed on the fourth and seventh floors.

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