Expert Answers to Alibaba Cloud Exam ACA-Developer Questions

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Alibaba Developer ACA Developer Certification

ACA Developer Certification

Last Update May 1, 2024
Total Questions : 95

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Questions 4

In PolarDB, if an UPDATE SQL statement encounters an issue, you need to check the execution plan to figure out the root cause. However, in the production environment, to avoid affecting the production data, what statement should you use to view the execution plan? (Number of correct answers: 2)

Options:

explain SQL

explain analyze SQL

explain verbose SQL

explain analyze verbose SQL

Discussion 0

Questions 5

A developer is writing logs through the Log Service API, and can see via the Logstore monitorin metrics that write traffic is about 10 MB/s, but a 403 error is reported during the writing process. Which of these is a possible cause?

Options:

There is significant network delay

The write throughput of a single partition is limited, and the 10 MB/s write traffic exceeds

There is not enough space in the Logstore partition

The target partition in the Logstore is not specified

Discussion 0

Questions 6

Which of the following descriptions of the principles of Alibaba Cloud SSL certificate private key protection is correct?

Options:

Alibaba Cloud uses the built-in functionality of the SSL certificate service to encrypt and store the private key to certificates private key

The plaintext of Alibaba Cloud's private key is usually stored on disk and backed up regularly

Alibaba Cloud Certificate Service uses symmetric encryption to save the certificate private key

Alibaba Cloud Certificate Service keys are loaded Into memory in plaintext format ONLY when needed

Discussion 0

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Questions 7

A developer runs a web application on a physical machine in an IDC. The machine is running Ubuntu Linux. Which of the following is the recommended method if he wants to migrate this web application onto an Alibaba Cloud ECS instance?

Options:

Use a third-party image creation tool to create an image from the physical server. Upload the image to the ECS console to turn it into a custom image. Then, use the custom image to create ECS instances.

Use SMC(Server Migration Center) to collect data from the origin physical server. Create an intermediate ECS instance on Alibaba Cloud and wait for the data transfer to complete. Then generate a new image directly from that intermediate ECS instance.

Use a third-party image creation tool to create an image from the physical server. The image is then uploaded to Alibaba Cloud Object Storage Service (OSS) for storage. In the ECS console, import that image from OSS, then, create an ECS instance from the custom image.

Discussion 0

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