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Free Alibaba ACA Developer Exam ACA-Developer Exam Questions

Page: 1 / 10 Total 95 questions

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Question 1

When you use SQL statements to access tables in a database without an index configured, a full table scan will be performed. If a table contains a large amount of data, this kind of scan will access a large amount of data and consume a lot of the database's resources. Which of the following options are best practices when creating database indexes? (Number of correct answers: 3)

Correct Answer: A. Add an index to a field that is frequently queried but does not frequently perform add, delete, or modify operations.; B. Applies indices to fields that contain many records.; D. Apply indexing to fields of fixed length (preferably not long fields).

Question 2

An Elastic Compute Service (ECS) instance (private IP only) needs to read data from a RDS MySQL database in another VPC through a private IP address, and at the same time, RDS's public internet endpoint needs to be available for requests from some internet clients. Which steps must be taken to allow applications to access this RDS instance via both interfaces? (Number of correct answers: 2)

Correct Answer: D. Configure a NAT gateway for the VPC to which the ECS instance belongs.

Question 3

In Alibaba Cloud RocketMQ, messages are kept for up to _____ days. We recommend configuring a monitoring service to watch the consumption status, and intervene manually when ''not consumed but to be deleted'' message alarms occur.

Correct Answer: B. 3

Question 4

When connecting to the Alibaba Cloud RDS database, in order to improve the completeness and integrity of the connection, you can enable SSL encryption and install an SSL CA certificate for the required application service. Which of the following statements are correct? (Number of correct answers: 3)

Correct Answer: A. Due to the way in which SSL encryption is implemented, enabling SSL encryption will significantly increase the CPU usage rate. Enable SSL encryption when there is an encryption requirement for the external network link. The intranet link is relatively safe, and generally no link encryption is required.; B. If the RDS instance is a multi-node instance, the system will trigger the active/standby switch after the SSL service is disabled.; C. When using read/write splitting, you can also enable SSL encryption to improve the security of the connection.

Question 5

When versioning is enabled for an OSS Bucket, previous versions of objects will be retained, using storage space and incurring additional costs. How can you save space and reduce costs, while retaining some of the benefits of object versioning?

Correct Answer: C. Use OSS s built in lifecycle management capabilities to automatically delete old versions of objects after a set time.

Question 6

Which data format is NOT supported by Alibaba Cloud Message Service?

Correct Answer: D. VERBOSE

Question 7

Which of the following is NOT a valid state for a scaling activity in Alibaba Cloud's Elastic Scaling Service ESS -also known as Auto Scaling) state of the scaling activity in the Alibaba Cloud elastic

scaling group?

Correct Answer: C. Failed

Question 8

You can use Alibaba Cloud Data transmission service (DTS) or the open source tool Redis-shake to migrate and synchronize data from a local Redis instance to an Alibaba Cloud Redis instance. What is one feature which DTS has but Redis-shake does not?

Correct Answer: A. Full data migration

Question 9

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?

Correct Answer: D. The target partition in the Logstore is not specified

Question 10

Which of these are good ways to secure access to your API deployed on Alibaba Cloud API Gateway?

(Number of correct answers: 3)

Correct Answer: A. Enable API Gateway to connect to backend services in an Alibaba Cloud VPC network group. This guarantees the security of API requests.; C. Use HTTPS to encrypt requests.; E. Allow only internal IP addresses to call the API.
Page: 1 / 10 Total 95 questions