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ACA-Developer Exam Dumps : ACA Developer Certification

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ACA Developer Certification Questions and Answers

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Question 1

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.

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Question 2

You can use Alibaba Cloud Data transmission service (DTS) or the open source tool Redis-shake to migrate and synchronize data from a local Redis instance to an Alibaba Cloud Redis instance. What is one feature which DTS has but Redis-shake does not?

Options:

A.

Full data migration

B.

Incremental data migration

C.

One-way data synchronization

D.

Two-way data synchronization

Question 3

Which of the following descriptions describes the (Security Token Service) STS service correctly? (Number of correct answers: 3)

Options:

A.

Through the STS service, RAM users or RAM roles can obtain a temporary token that allows them to call the Alibaba Cloud API or use the web console

B.

A STS request consists of an access address, communication protocol, request method, request parameters and character encoding

C.

When calling the STS API, in order to ensure the safe calling of the API, Alibaba Cloud will authenticate each API request through a signature when each API call is made

D.

The STS service supports the use of both HTTP and HTTPS protocols

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