Year End Sale - Special Limited Time 65% Discount Offer - Ends in 0d 00h 00m 00s - Coupon code: dpt65

ACA-Developer Questions and Answers

Question # 6

What are the benefits of creating indexes on PolarDB? (Number of correct answers: 2)

A.

Improve the query efficiency SELECT statements.

B.

Improve the efficiency of DML operations such as UPDATE.

C.

Improve the efficiency of DDL operations.

D.

Reduce invalid data scanning.

Full Access
Question # 7

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)

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.

D.

It is discovered that an Alibaba Cloud RDS SSL certificate is about to expire, and the validity period needs to be updated, requiring that the certificate be updated, then reinstalled. This will restart the RDS instance.

Full Access
Question # 8

In order to have your applications interact with Alibaba Cloud RabbitMQ, you need to create related MQ resources first. Which of the following resources must be created? (Number of correct answers: 3)

A.

Vhost

B.

Exchange

C.

Queue

D.

Broker

E.

Topic

Full Access
Question # 9

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?

A.

Rejected

B.

Executing

C.

Failed

D.

Timeout

Full Access
Question # 10

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)

A.

explain SQL

B.

explain analyze SQL

C.

explain verbose SQL

D.

explain analyze verbose SQL

Full Access
Question # 11

Which of the following database connection methods does ApsaraDB for Redis support? (Number of correct answers: 2)

A.

DMS (Data Management Service)

B.

aliyun-cll

C.

Redis-cIl

D.

Sentinel

Full Access
Question # 12

You have an application with the following requirements:

7. There will be a lot of video content that need to be uploaded.

2. Each uploaded video needs to be preprocessed to provide different video resolutions and quality levels to accommodate different devices and network conditions.

3. It should be possible to process video in parallel at scale, to ensure that videos are preprocessed in a reasonable amount of time.

Which of the following Alibaba Cloud applications can be combined to provide a low operation and maintenance burden and relatively low operating costs? (Number of correct answers: 3)

A.

Serverless Workflow

B.

Function Compute

C.

Log Service

D.

Elastic Compute Service (ECS)

E.

Server Load Balancer (SLB)

Full Access
Question # 13

Elastic Container instance (ECI) is an agile, secure, serverless service for running containers. If you need to configure public network access for ECI, which of these are reasonable solutions? (Number of correct answers: 3)

A.

Specify a public IP address when creating the ECI.

B.

Bind a NAT gateway and an EIP to the VPC to which the ECI belongs.

C.

Configure ECI as a backend for a Server Load Balancer (SLB) that has a public IP address.

D.

Bind an Elastic IP (EIP) to the ECI instance.

Full Access
Question # 14

Log Service uses a semi-structured data model to define a log. This mode contains five data fields:

Topic, Time, Content, Source, and Tags. Log Service has different requirements for the format of each field in the log. Which of the following fields cannot be empty characters? (Number of correct answers: 4)

A.

Topic

B.

Time

C.

Content

D.

Source

E.

Tags

Full Access