MongoDB Multiple choice Questions and Answers-Aggregation Concepts and Aggregation Mechanics

1.	____________ are operations that process data records and return computed results.
a.	ReplicaAgg
b.	SumCalculation
c.	Aggregations
d.	None of the mentioned

Discuss

Answer: (c).Aggregations

2.	Point out the wrong statement.
a.	Map-reduce cannot have a finalize stage to make final modifications to the result
b.	Map-reduce is less efficient and more complex than the aggregation pipeline
c.	Specifically, a user with the userAdmin role can grant itself any privilege in the database
d.	All of the mentioned

Discuss

Answer: (a).Map-reduce cannot have a finalize stage to make final modifications to the result

3.	Running data aggregation on the ________ instance simplifies application code and limits resource requirements.
a.	document
b.	mongod
c.	mongos
d.	all of the mentioned

Discuss

Answer: (b).mongod

4.	Documents enter a multi-stage __________ that transforms the documents into an aggregated result.
a.	pipeline
b.	pipelineView
c.	pipelineUser
d.	all of the mentioned

Discuss

Answer: (a).pipeline

5.	Point out the wrong statement.
a.	MongoDB also provides map-reduce operations to perform aggregation
b.	The pipeline provides efficient data aggregation using native operations within MongoDB
c.	Map-reduce can specify a query condition to select the input documents as well as sort and limit the results
d.	None of the mentioned

Discuss

Answer: (d).None of the mentioned

6.	The most basic pipeline stages provide __________ that operate like queries.
a.	methods
b.	filters
c.	stored procedure
d.	none of the mentioned

Discuss

Answer: (b).filters

7.	Pipeline stages can use __________ for tasks such as calculating the average or concatenating a string.
a.	replicas
b.	operators
c.	roles
d.	all of the mentioned

Discuss

Answer: (b).operators

8.	Map-reduce uses custom __________ functions to perform the map and reduce operations.
a.	Java
b.	Javascript
c.	JSON
d.	None of the mentioned

Discuss

Answer: (b).Javascript

9.	Which of the following operation can be optionally used for map reduce?
a.	finally
b.	final
c.	static
d.	none of the mentioned

Discuss

Answer: (a).finally

10.	The aggregation pipeline can use ___________ to improve its performance during some of its stages.
a.	indexes
b.	OptmData
c.	functions
d.	all of the mentioned

Discuss

Answer: (a).indexes