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MongoDB C100DBA Online Practice Exam Questions

The questions of C100DBA were last updated on Apr 19,2024 .

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Question#1

In a sharded cluster, from which node does one stop the balancer process before initiating backup?

A. Any node
B. replicaset primary node
C. config server node
D. mongos node

Question#2

Which of the following is correct about MongoDB?

A. MongoDB supports geospatial indexes
B. MongoDB supports some of the SQL functions
C. MongoDB uses JSON format to represent documents
D. MongoDB supports collection joins

Question#3

You have the following index on the toys collection:
{
"manufacturer" : 1,
"name" : 1,
"date" : -1
}
Which of the following is able to use the index for the query? Check all that apply.

A. db.toys.find( { name : "Big Rig Truck", date : "2013-02-01", manufacturer : "Tanko"
B. db.toys.find( { manufacturer : "Matteo", name : "Barbara", date : "2014-07-02" } )
C. db.toys.find( { date : "2015-03-01", manufacturer : "Loggo", name : "Brick Set" } )

Question#4

Update If Correct is an approach for which of the following concepts in MongoDB:

A. Concurrency Control
B. Atomicity
C. Performance Management
D. Transaction Management

Question#5

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

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

Exam Code: C100DBA
Q & A: 132 Q&As
Updated:  Apr 19,2024

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