Question 1

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)

Options :

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

B :

RDS realizes real-time synchronization between the master instance and the remote disaster recovery

instance through Data Transmission Service (DTS)

C :

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

D :

When the database deletion operation is performed on the master instance, the operation will also be

synchronized to the disaster recovery instance

Answer: D

Question 2

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 3

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 4

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 5

Which of the following permission control policies does Object Storage Service (OSS) provide for access to

objects stored in a bucket? (Number of correct answers: 4)

Options :

A : ACL

B : RAM Policy

C : Bucket Policy

D : STS authorization

E : Dynamic blacklist

F : Object Policy

G :

IntranetAccess

Answer: A,C,D

Free ACA-Developer Mock Exam – Practice Online Confidently

Buying Options: