ACA-Operator Alibaba Cloud ACA System Operator Certification exact Exam Questions

ACA System Operator Certification

Last Update 1 week ago Total Questions : 62

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Question # 4

Which of the following steps is NOT mandatory when creating an API through Alibaba Cloud API Gateway?

Define basic API information

Attach a domain name

Define API Request parameters

Define the API backend service

Question # 5

Which database utility is suitable for database migration?

DMS

DBS

DTS

DAS

Question # 6

Which of the following is NOT required for SMC (Server Migration Center) to

migrate a server to Alibaba Cloud?

Import the migration source information to the SMC console

From the SMC console, configure the type of disk image to be generated during the migration

The SMC client transfers the source data to an intermediate ECS instance

The SMC backend service generates a target Alibaba Cloud image based on the migration source

Question # 7

A developer is making the ModifyDBInstanceSpec API call to change the specifications of an RDS instance, but the operation fails. Why could this be? (Number of correct answers: 3)

The instance is in the "running" state

No instance type (specification) was included in the request parameters

The instance has a backup task being executed

The targeted RDS instance is a disaster recovery instance

Question # 8

A company is developing a music application based on OSS and ECS, their users can download mp3 files after signing up for the application. Recently, the public network traffic to the OSS has doubled but the increase of registered users is less than 10%. After in-depth analysis, system operators find that many download requests are requested from the external search engine. In this case, which of the following measures is thought to be able to address this issue?

Migrate music files from the OSS to the data disks for ECS instances

Change the website access mode to HTTPS

Enable “Hotlink protection” of OSS and use an HTTP Referer whitelist to prevent unauthorized users from accessing your data

Use SLB for extra protection

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)

Add an index to a field that is frequently queried but does not frequently perform add, delete, or modify operations.

Applies indices to fields to contain many records.

A table should not contaiiAiore than 6 indexed fields.

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

Adhere to the rightmost prefix principle when using composite indexes