mongodb interview questions and answers

MongoDB Interview Questions and Answers

by GangBoard Admin, October 31, 2018

In case you’re searching for MongoDB  Interview Questions and answers for Experienced or Freshers, you are at the correct place. There is parcel of chances from many presumed organizations on the planet. The MongoDB  advertise is relied upon to develop to more than $5 billion by 2020, from just $180 million, as per MongoDB  industry gauges. In this way, despite everything you have the chance to push forward in your vocation in MongoDB  Development. Gangboard offers Advanced MongoDB  Interview Questions and answers that assist you in splitting your MongoDB  interview and procure dream vocation as MongoDB  Developer.

Best MongoDB  Interview Questions and Answers

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Q1) Compare MongoDB and Cassandra


  • data mode are document
  • database scalability is read only
  • query of the data is multi-index


  • data mode are big table like
  • database scalability is write only
  • query of the data is using key or scana

Q2) what make magodb best?

it is consider has nosql database  because documented oriented (do).

Q3) When do we use Namespace in MongoDB?

in  database hte namespace is used

Q4) when an index does not fit into RAM?

index is very huge then index will not fit to RAM.

Q5) If you remove an object attribute, is it deleted from the database?

yes when the object attribute is delete then the object will be drop

Q6) Define MongoDB.

it th DO database which use in high availability and it is dynamic schema loction

Q7) What are the key features of mongodb?

  • high perform
  • high availability
  • automatic scaling,

Q8) what is meant by CRUD?

create read update delete

Q9)What is sharing in MongoDB?

the process of storing the record in multiple Machine is know has sharing.

Q10) How can you see the connection used by Mongos?

Mongos use db_adminCommand (“connPoolStats”);

Q11) Explain what is a replica set?

A replica set is the group of magodb instance which is host in same data set

Q12) How replication works in MongoDB?

the process of synchronization across the multiple server os know has replication.

Q13) While creating Schema in MongoDB what are the points need to be taken in consideration?

below are the following point need to be take care while carating the schema the combine objects into one document if you use them together for most frequent use cases optimize your schema

Q14) What is the syntax to create a collection?


db.create Collection(name,options)

Q15) What is the syntax to drop a collection?


drop collection in MongoDB is db.collection.drop()

Q16) Mention what is Object ld composed of?

  • Timestamp
  • Client machine ID
  • Client process ID
  • byte incremented counter

Q17) Mention what is the command syntax for inserting a document?

syntax :

database.collection.insert (document).

Q18) What is the command syntax that tells you whether you are on the master server or not? And how many master does MongoDB allow?

  • Command syntax
  • isMaster()

Q19) Mention the command syntax that is used to view Mongo is using the link?



Q20) Mention what is the basic syntax to use index in MongoDB?

syntax :

>db.COLLECTION_NAME.ensureIndex ( {KEY:1} ).

Q21)Explain what is GridFS in MongoDB?

while  storing and retrieving large files such as images.

Q22) What are alternatives to MongoDB?

  • Cassandr
  • CouchDB
  • Redis
  • Riak

Q23) What kind of NoSQL database MongoDB is?

It is a document oriented database.

Q24) Which all languages can be used with MongoDB?


Q25) How is MongoDB better than other SQL databases?

it Permits  highly flexible and scalable document structure. does not support such relationships.

Q26) Does MongoDB need a lot of RAM?

it can run on small amount of data because it is dynamic space are allocated and re-allocated.

Q27) What is Mongo DB?

It is an open source database and prominent NOSQL database.

Q28)     What are all the advantage of MongoDB?

  • It is a Schema less.
  • Structure of a single object is clear.
  • No complex joins.
  • Easy of scale-out

Q29) How to create the database in Mongo DB?

Use Database name

Example: Use MYDB

Q30) How to show the entire database?

Show dbs

Q31) What are the datatypes Mongo DB supports?

String, Integer, Boolean, Double, Array, Timestamp, Date, Regular expression

Q32) How to insert document in Mongo DB collection?


Q33) How to display all the documents?


Q34) What is the purpose of pretty () method?

Pretty () method used to display in formatted way.

Q35) What is the use of limit ()?

It will used to limit the value display from the documents.

DB.DBNAME.find ().limit (number)

Q36) What are all the Aggregate function in Mongo DB?

Sum, Avg, Min, Max, Push, addToSet, first, last

Q37) What is replication and why we need?

It is the process of synchronizing data across multiple server. It provides redundancy and increases data availability with multiple copies of data on different database server.WHY: To keep data safe, High availability of data, disaster recovery, No downtime for maintenance.

Q38) What is the syntax of sort() method?


Q39) What is CRUD?

CRUD operations are Create, Read, Update, Delete.

Q40) What is the syntax to drop the collections?


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