Question 1

A developer creates a MySQL database service on a Linux ECS instance (ECS-A), and wants to access this

database service from another instance (ECS-B) in the same VPC using the private IP address bound to the

ECS instance, however, the connection can't be established. What could cause this? (Number of correct

answers: 2)

Options :

A : The security group for ECS-A does not have the default MySQL service port open.

B : The built-in firewall on ECS-A has rules that prohibit external access to the MySQL service port.

C : No Internet IP address is configured for ECS-A.

D : The bind-address parameter set in the my.ini configuration file of the MySQL service is commented out.

Answer: C,D

Question 2

Function Compute supports one-way triggers and two-way triggers. Which of the following triggers is a

one-way trigger? That is to say you only need to configure the trigger in the event source, not in Function

Compute?.

Options :

A : OSS event trigger(s)

B : CloudMonitor trigger(s)

C :

MNS topic trigger(s)

D : SLS trigger(s)

Answer: B

Question 3

Which of the following web applications are suitable for deployment on Simple Application Server (SAS), as

compared with LCS? (Number of correct answers: 3)

Options :

A :

Quickly build a personal blog website

B :

Quickly build a small e-commerce website

C :

Set up a NoSQL database service

D :

Quickly build a personal, learning, or test environment

Answer: A,C

Question 4

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)

Options :

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.

C :

table should not contain more 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.

Answer: A,B,D

Question 5

Which of the following is NOT a feature of Alibaba Cloud's Cassandra database service?

Options :

A : Centerless distributed architecture

B :

Supports both narrow and wide tables, providing flexible schema functions

C :

Cluster storage, strong expansion of read and write capabilities

D :

Enterprise-level capabilities such as disaster tolerance, backup and recovery, security, and monitoring

across data centers

Answer: B