mongodb interview questions and answers

MongoDB Interview Questions and Answers

by GangBoard Admin, October 31, 2018

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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?


Q41) What is embedded documents?

Embedded documents are received while they were small, given the relations between the related data has been written in one body.

Q42) Define application level encryption.

Application Level Encryption provides encryption or per-per-written from the field in the application layer.

Q43) The encryption storage?

MongoDB encryption encrypts data stored on any storage or processing by operating system may not be able to access protected data.

Q44) When everything is in no way sufficient data to get extended to multi-cut?

That stands in a few MongoDB collection. Therefore, the list is kept in a lump of dough of all substances, it is either in size. It is only when there is additional time slot, there will be no piece of information was a few choices, but the lump is more than 1, data is far from a lot of slices and can be extended up to 64 MB.

Q45) The judge in the MongoDB and Couchbase and CouchbaseDB?

When the common segment DB DB is Couchbase Couchbase Brunfelsia necessary in many ways, crossing points, all of which differ in the form of ecological duplications etc. As to the execution

Q46) Miâ on how we use MongoDB?

By sequencing of database, and the names of the pages linked from a specified collection is used.

Q47) If you remove an object attribute database wipes?

So deleted. It is better to be safe to remove the attribute.

Q48) How can we move into the old directory file moveChunk?

Since, however, the present and the old files are converted to the backup file is moved at the time of the acquisition moveChunk directory space.

Q49) Explain the situation with the index does not fit in RAM?

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Q50) What MongoDB will provide consistency?

The writer makes use of MongoDB is he that readeth, and the bolts of it, after allowing to access one considers arbitrary or that any one that my readers may at the same time as the collection of a database. And it always brings access to private and hated by others.

Q51) Why did not MongoDB 32-bit system because he chose?

32 bit candidate for a non-Brunfelsia DB is contained, that means running 32 bit with the MongoDB server, information and indexes require 2 GB. 32-bit, so it is not the only way to enter my thoughts.

Q52) How does working on Journaling MongoDB?

There is nothing memory Journaling saved. The book on-disk files are really useful to have said that the route habitual. DbPath interior is designed in the Journal subdirectory MongoDB.

Q53) How can we separate cursors connection with the write injustice?

Snapshot () method is used to separate them from coming in with cursors writes. Here is a list of query and make sure everyone comes to be, and the manner of his mother tongue, there has been only to look at the article.

Q54) Define MongoDB.

It may be a document is to be oriented database of speech, with which the top of their minds to ease of scalability and easy to get high performance. The Scheme supports dynamic policy.

Q55) Explain the image set.

I have to put the example of which is the group made up of Brunfelsia same knowledge of the set. To kill, and I need to provide high availability redundancy is the image of, and in the production of all of the deployments.

Q56) What are the key features of mongodb?

3 and of the sea There are, however, latae sententiae, which are mongodb scaling: High performance and high availability.

Q57) The Crud?

Mongodb provides Crud are created, Read, Update, Delete.

To learn more information about the MongoDB Crud click here.

Q58) The sharding?

Sharding to store data on multiple machines.

Q59) What is the sum of the MongoDB?

What matters are aggregations process data records and return the results of counting.

Q60) To define the nominal distance mongodb?

And what is the name of the collection database.

Q61)Syntax is used to create a collection mongodb?

db.createCollection (name, options) is used to create a collection mongodb.

Syntax collection.

Q62) That is to drop the mongodb?

db.collection.drop () is a collection to drop the mongodb.

Q63) Explain Infection.

Infection by more synchronous processing of data servers.

Q64) What is the use of index mongodb?

You can read a thing often used to provide a guideline for the high performance of queries.

Q65) The government should be inserted here because it is used?

database.collection.insert (document) is used for inserting the document.

Q66) What is the use of GridFS mongodb?

GridFS as I hear, is used for storage and for the most retrieving files, images, video files.

Q67) Journaling used?

Journaling is the use of the back of the mongodb to be saved.

Q68) That the government used to bond?

db_adminCommand ( “connPoolStats”); See the connection is not used.

Q69)Define the image killing?

The first things to write replicas but embraced the culture.

Q70) Define secondary image killing.

Secondaries (page 565) Brand apply for the primary, and op oplog.

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