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  • Exam Name: ACA System Operator Certification
  • Last Update: Sep 12, 2025
  • Questions and Answers: 62
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ACA-Operator Practice Exam Questions with Answers ACA System Operator Certification

Question # 6

Which of these metrics are collected by CloudMonitor’s Host Monitoring function? (Number of correct answers: 3)

A.

CPU status of the ECS instance

B.

Running processes on the ECS instance

C.

Storage space used by OSS buckets

D.

ECS network I/O

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Question # 7

Cloud Config tracks configuration changes of your resources and evaluates configuration compliance.

A.

True

B.

False

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Question # 8

Which of these log formats is currently supported by Alibaba Cloud’s ActionTrail?

A.

XML

B.

HTML

C.

JSON

D.

Markdown

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Question # 9

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)

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 to contain many records.

C.

A table should not contaiiAiore than 6 indexed fields.

D.

Apply indexing to fields of fixed length (preferably not long fields).

E.

Adhere to the rightmost prefix principle when using composite indexes

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Question # 10

In Alibaba Cloud, a developer finds that the ECS instance he created does not

have public IP assigned. The API method used was “CreateInstance”. Which

of the following is the most likely reason?

A.

The developer did not call AllocatePublicIpAdress (an additional API call), which is needed to assign a public IP

B.

The CreateSecurityGroup API call was not made

C.

The CreateDisk API call was not made

D.

The ECS was not restarted after being created

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Question # 11

PolarDB supports three engines: MySQL, PostgreSQL and Oracle.

A.

True

B.

False

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Question # 12

A Developer is creating a Function Compute function. This function requires around 1 GB of temporary storage for files while executing. These files will not be needed after the function is completed for a fixed period. How can this developer MOST efficiently handle the temporary files?

A.

Store the files in Cloud Disk and delete the files when Function Compute function call completes.

B.

Copy the files to NFS and delete the files when the Function Compute function call completes.

C.

Store the files in the /tmp directory on a temporary ECS instance, and delete the files at when the Function Compute function call completes.

D.

Copy the files to an OSS bucket with a lifecycle policy configured to delete the files automatically.

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Question # 13

Which of these Alibaba Cloud services are used for security (either credentials management, logging, or auditing?) (Number of correct answers: 3)

A.

ActionTrail

B.

Log Service

C.

Key Management Service (KMS)

D.

Table store

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Question # 14

________________ is a fully-managed event-driven computing service that allows you to run code in an elastic and reliable way?

A.

Function Compute

B.

Serverless Workflow

C.

Elastic Compute Service (ECS)

D.

Batch Compute

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Question # 15

Alibaba Cloud Log Service allows you to store and search logs from a variety of sources, but has no built-in visualization capabilities.

A.

True

B.

False

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Question # 16

You are responsible for the system operations of a product and have implemented the cloud infrastructure in the Alibaba Cloud platform. When

business loads increase, _______ automatically adds ECS instances to

ensure sufficient computing capabilities. When business loads decrease, the

same service automatically removes ECS instances to save costs. Which

service are you using?

A.

Server Load Balancer (SLB)

B.

Auto Scaling

C.

Resource Orchestration Service (ROS)

D.

Resource Access Management (RAM)

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Question # 17

Which Alibaba Cloud service is an automated operations and maintenance (O&M) service to execute O&M tasks?

A.

Operation Orchestration Service (OOS)

B.

Maintenance Orchestration Service (MOS)

C.

Resource Orchestration Service (ROS)

D.

Resource Access Management (RAM)

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Question # 18

Which of the following options are correct for Multipart Upload and Resumable Upload in Object Storage Service (OSS)? (Number of correct answers: 3)

A.

Use Multipart Upload to upload multiple parts of a file in parallel to speed up the upload process

B.

Multipart Upload is usually used when the size of the file to be uploaded is large

C.

If the upload fails due to an accident during the uploading of fragments, you need to upload all the fragments again

D.

After an upload is interrupted, the portions of the file which have successfully uploaded prior to the interruption will be saved in the OSS bucket

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