MongoDB Online Quiz - Tutorialswebsite

It’s time to test the MongoDB skills after learning all the MongoDB tutorials. This free MongoDB Quiz will help you prepare for the interview with MongoDB.

MongoDB Quiz is not just a test, but a parameter that will measure your knowledge and capabilities, especially for you. So, if you want to check the basics please refer to our MongoDB tutorial series before taking this advanced MongoDB assessment test.

Table of Contents

Results

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#1. The difference between $push and $addToSet is:

$addToSet adds the item to the field only if the new item is of the same datatype

$addToSet needs the fields to be already present while $push will work even if the field is not present

$addToSet adds the item to the field only if it does not exist already; while $push pushes the item to the field irrespective of whether it was present or not

There is no major difference between them. $addToSet is a deprecated version of $push

#2. What command will you use to list all available databases?

show dbs

show databases

show db

show alldb

#3. Point out the wrong statement.

A single page fault completes slowly and is problematic

Increasing the amount of RAM accessible to MongoDB may help reduce the frequency of page faults

Page faults also can occur while accessing large data sets or scanning an entire collection

None of the mentioned

#4. By default, db.collection.explain() runs in ___________ verbosity mode.

VerbosityMode

queryPlanner

executeStats

none of the mentioned

#5. What does the following query do when performed on the posts collection? db.posts.update({_id:1},{Title:This is post with ID 1″})

Updates the Title of the post

Updating a document is possible only with $set

Replaces the complete document with _id as 1 with the document specified in second parameter

Syntax error

#6. The _______ operator can be used to identify an element in the array to be updated without explicitly specifying the position of the element.

$elemMatch

$slice

Updating an array field without knowing its index is not possible

#7. Create or insert operations add new documents to a collection. If the collection does not currently exist, insert operations will create the collection.

True

False

#8. You can inspect __________ to check the amount of mapped memory that mongod is using

mem.mapped

memory.resident

mem.resident

all of the mentioned

#9. What is the output of the following program?

60 s

100 ms

1 s

100 s

#10. What function do you use to format the query results in mongo shell?

pretty()

format()

print()

#11. Which of the following command inside aggregate command is used in MongoDB aggregation to filter the documents to pass only the documents that match the specified condition(s) to the next pipeline stage.

$group

$match

$aggregate

$sum

#12. Point out the correct statement.

Spikes in the number of available connections can also be the result of application or driver errors

For read-heavy applications, increase the size of your replica set and distribute read operations to secondary members

For read-heavy applications, deploy sharding and add one or more shards to a sharded cluster to distribute load among mongod instances

All of the mentioned

#13. What command will you use to display the database you are using?

show db

show all

show databases

#14. With the _______ storage engine, MongoDB uses memory-mapped files to store data.

MMAPv2

MMAPv1

WiredTiger

All of the mentioned

#15. Which language is MongoDB written in?

C++

Java

Python

MongoC

#16. What is a replica set node which does not maintain its own data but exists only for voting purpose called?

Secondary

Arbiter

Delayed

Hidden

#17. The memory usage statuses metrics of the _________ output can provide insight into MongoDB’s memory use.

globalstats

serverStatus

locks.deadlockCount

all of the mentioned

#18. MongoDB reports its triggered page faults as the total number of page faults in ________ second.

1 (Rapid increases in the MongoDB page fault counter may indicate that the server has too little physical memory.)

100

1000

None of the mentioned

#19. ____________ returns information on the query plan for aggregate function.

Reporter

db.collection.explain()

db.collection.explainplan()

None of the mentioned

#20. Which of the operator is used to access the query field of documents within system.profile?

$select

$retrieve

$query

None of the mentioned

Finish

Pradeep Maurya

Pradeep Maurya is the Professional Web Developer & Designer and the Founder of “Tutorials website”. He lives in Delhi and loves to be a self-dependent person. As an owner, he is trying his best to improve this platform day by day. His passion, dedication and quick decision making ability to stand apart from others. He’s an avid blogger and writes on the publications like Dzone, e27.co

Results

#1. The difference between $push and $addToSet is:

#2. What command will you use to list all available databases?

#3. Point out the wrong statement.

#4. By default, db.collection.explain() runs in ___________ verbosity mode.

#5. What does the following query do when performed on the posts collection? db.posts.update({_id:1},{Title:This is post with ID 1″})

#6. The _______ operator can be used to identify an element in the array to be updated without explicitly specifying the position of the element.

#7. Create or insert operations add new documents to a collection. If the collection does not currently exist, insert operations will create the collection.

#8. You can inspect __________ to check the amount of mapped memory that mongod is using

#9. What is the output of the following program?

#10. What function do you use to format the query results in mongo shell?

#11. Which of the following command inside aggregate command is used in MongoDB aggregation to filter the documents to pass only the documents that match the specified condition(s) to the next pipeline stage.

#12. Point out the correct statement.

#13. What command will you use to display the database you are using?

#14. With the _______ storage engine, MongoDB uses memory-mapped files to store data.

#15. Which language is MongoDB written in?

#16. What is a replica set node which does not maintain its own data but exists only for voting purpose called?

#17. The memory usage statuses metrics of the _________ output can provide insight into MongoDB’s memory use.

#18. MongoDB reports its triggered page faults as the total number of page faults in ________ second.

#19. ____________ returns information on the query plan for aggregate function.

#20. Which of the operator is used to access the query field of documents within system.profile?

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