Question 1

Below is a sample document of 'orders' collection Other-Image-2821600ab-2cee-4cd9-a321-aa3202108fcf

Options :

A : $project

Answer: A

Question 2

Which of the following collections stores authentication credentials in MongoDB?

Options :

A : test.users

B : local.users

C : system.users

D : users.users

Answer: C

Question 3

What does the output x of the following MongoDB aggregation query result into; db.posts.aggregate( [ { $group: { _id; '$author', x: { $sum: $likes } } } ] )

Options :

A : Average of likes on all the posts of an author, grouped by author

B : Number of posts by an author

C : Sum of likes on all the posts by all the authors

D : Sum of likes on all the posts by an author, grouped by author

Answer: D

Question 4

In order to ensure that you can maintain high availability in the face of server failure, you should implement which of the following?

Options :

A : Sharding

B : Properly defined user roles

C : Replication

D : Put indexes on all of your documents

E : The proper storage engine

Answer: C

Question 5

You have a replicated cluster with 1 primary, 3 secondary, 1 arbiter. One of the secondary is hidden. What is the replication factor of this replicated cluster?

Options :

A : 7

B : 03

C : 04

D : 06

Answer: C

Free C100DBA Mock Exam – Practice Online Confidently

Buying Options: