QUESTION: 1

Which command is used to get the Docker daemon information?

docker info
docker version
docker pull
docker image

Answer(s): A

Reference:

https://docs.docker.com/engine/reference/commandline/info/

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

Answer(s): A,C,D

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QUESTION: 3

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

Answer(s): B

Reference:

https://www.alibabacloud.com/help/doc-detail/29478.htm

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QUESTION: 4

Which of the following statements about ECS Snapshot is NOT correct?

You can manually create snapshots
You can create automatic snapshots
You can roll back a disk by using a snapshot
You can create an ECS instance from a snapshot

Answer(s): D

Explanation:

You can create a custom image from a snapshot that contains the operating system and data of an ECS instance. Then, you can use the custom image to create multiple instances that have identical application environments.

Reference:

https://www.alibabacloud.com/help/doc-detail/25391.htm

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QUESTION: 1

Reference:

QUESTION: 2

QUESTION: 3

Reference:

QUESTION: 4

Explanation:

Reference: