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Welcome to the Aggregation Concepts and Aggregation Mechanics MCQs Page

Dive deep into the fascinating world of Aggregation Concepts and Aggregation Mechanics with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Aggregation Concepts and Aggregation Mechanics, a crucial aspect of MongoDB. In this section, you will encounter a diverse range of MCQs that cover various aspects of Aggregation Concepts and Aggregation Mechanics, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within MongoDB.

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Check out the MCQs below to embark on an enriching journey through Aggregation Concepts and Aggregation Mechanics. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of MongoDB.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Aggregation Concepts and Aggregation Mechanics. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Aggregation Concepts and Aggregation Mechanics MCQs | Page 8 of 12

Explore more Topics under MongoDB

Q71.
_______ is used for access text search metadata.

a.

$text

b.

$metades

c.

$meta

d.

All of the mentioned

Discuss
Answer: (c).$meta
Q72.
Which of the following accepts named parameters?

a.

$reduce

b.

$letnum

c.

$let

d.

None of the mentioned

Discuss
Answer: (d).None of the mentioned
Q73.
_______ returns the number of elements in the array.

a.

$number

b.

$size

c.

$div

d.

None of the mentioned

Discuss
Answer: (b).$size
Q74.
_________ returns a value without parsing.

a.

$string

b.

$literal

c.

$characters

d.

None of the mentioned

Discuss
Answer: (b).$literal
Q75.
db.collection.aggregate() returns a _______ and can return result sets of any size.

a.

replica

b.

cursor

c.

document

d.

$subtract

Discuss
Answer: (b).cursor
Q76.
The _____ JavaScript engine allows multiple JavaScript operations to execute at the same time.

a.

V8

b.

V12

c.

V7

d.

None of the mentioned

Discuss
Answer: (a).V8
Q77.
Point out the correct statement.

a.

The read phase takes a exclusive lock

b.

The map-reduce operation is composed of many tasks

c.

Prior to version 3, JavaScript code executed in a single thread

d.

All of the mentioned

Discuss
Answer: (b).The map-reduce operation is composed of many tasks
Q78.
If the ______ field for mapReduce has the sharded value, MongoDB shards the output collection using the _id field as the shard key.

a.

input

b.

$in

c.

$out

d.

none of the mentioned

Discuss
Answer: (c).$out
Q79.
In MongoDB __________ mongos retrieves the results from each shard, performs a merge sort to order the results.

a.

3.0

b.

2.0

c.

1.0

d.

None of the mentioned

Discuss
Answer: (b).2.0
Q80.
Point out the wrong statement.

a.

If the output collection does not exist, MongoDB creates and shards the collection on the _id field

b.

Map-reduce supports operations on sharded collections, both as an input and as an output

c.

mongos dispatches, in parallel, a map-reduce post-processing job to every shard that owns a chunk

d.

None of the mentioned

Discuss
Answer: (d).None of the mentioned
Page 8 of 12

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