ACA-Developer Alibaba Cloud ACA Developer Certification exact Exam Questions

ACA Developer Certification

Last Update 23 hours ago Total Questions : 95

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Question # 21

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

DMS (Data Management Service)

aliyun-cll

Redis-cIl

Sentinel

Question # 22

Which of the following options describes the basic concepts of Alibaba Cloud Tracing Analysis correctly? (Number of correct answers: 3)

Alibaba Cloud Tracing Analysis model relies on OpenTracing

In the OpenTracing standard, a call chain can be regarded as a directed acyclic graph (DAG) composed of multiple Spans. The relationship between spans is named References

In the OpenTracing standard, each Span represents a named and timed non-continuous execution segment in the call chain

In some cases, timing diagrams based on the timeline are used to show the call chain

Question # 23

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 that contain many records.

table should not contain more 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.

Question # 24

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)

Vhost

Exchange

Queue

Broker

Topic

Question # 25

As more businesses move online and collect more data about their users, databases are beginning to grow very large, affecting table query performance and business operations. In order to solve these problems, in addition to sub-database sub-table transformation, we can also use Data Management Service (DMS) ' s archiving function to regularly archive large table data. We can then remove the archived records from the original table to improve query performance. Which of these statements about this feature of DMS is NOT correct?

The supported database types are RDS MySQL and PolarDB MySQL

Before you can use this feature of DMS, you must first enable Alibaba Cloud ' s Database Backup Service (DBS)

Backup data can be stored In OSS

The user role of this operation must be ' administrator " or " DBA "

Question # 26

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?

Avoid using version management.

Use the Function Compute Service to regularly check for and delete old versions of objects.

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

Use OSS ' s built in lifecycle management capabilities to move old versions of objects to Archival Storage.

Question # 27

Alibaba Cloud Content Delivery Network (CDN) is a suitable product for the following scenarios: (Number of correct answers: 2)

BBS forums with less than 100 daily page views.

Static sites with more than 100,000 daily page views.

Images, HTML, CSS and JS files on a medium-sized E-commerce website.

News websites with more than 30 million daily page views and users are all from Singapore.

Question # 28

For business scenarios with strong data reliability requirements or financial business scenarios with regulatory requirements related to data durability and availability, RDS MySQL provides a remote backup mechanism to improve reliability. Which of the following is correct, regarding RDS ' s remote disaster recovery capabilities? (Number of correct answers: 3)

The primary database (the one to be backed up) must have an Alibaba Cloud Intranet address

RDS realizes real-time synchronization between the master instance and the remote disaster recovery instance through Data Transmission Service (DTS)

When an outage occurs in the area where the primary instance is located, and neither the primary instance (Master) nor the standby instance (Slave) can be connected to, the remote disaster recovery instance can be switched to the primary instance

When the database deletion operation is performed on the master instance, the operation will also be synchronized to the disaster recovery instance