MongoDB Interview Questions and Answers

Last updated on Jan 10, 2023
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MongoDB Interview Questions

Based on the document-oriented NoSQL database, MongoDB is an open-source database management system (DBMS) that is used for high volume data storage. MongoDB is one of many non-relational database technologies that came up in the mid-2000s for use in big data applications and other processing jobs. Instead of using tables and rows as in other databases, MongoDB architecture uses documents and collections. We have an impressive collection of MongoDB Interview Questions and Answers that is a must-read for all developers!

About MongoDB
What is MongoDB MongoDB is an open-source database management system (DBMS) that is used for high volume data storage. MongoDB is one of many non-relational database technologies that came up in the mid-2000s for use in big data applications and other processing jobs.
Latest Version 6.0.1, released on 19th August 2022
Created By MongoDB Inc.
License Various; see § Licensing
Written in C++, Go, JavaScript, Python
Initial release date 11 February 2009

Most Frequently Asked MongoDB Interview Questions

Here in this article, we will be listing frequently asked MongoDB Interview Questions and Answers with the belief that they will be helpful for you to gain higher marks. Also, to let you know that this article has been written under the guidance of industry professionals and covered all the current competencies.

Q1. How to list all indexes in MongoDB?
Answer

To list all indexes you can use db.items.getIndexes()

Q2. What is MongoDB and how it works? Explain
Answer

MongoDB is an open source database management system (DBMS) that is used for high volume data storage. MongoDB is one of many non-relational database technologies that came up in the mid-2000s for use in big data applications and other processing jobs. Instead of using tables and rows as in other databases, MongoDB architecture uses documents and collections.

Q3. What are the uses of MongoDB? Explain
Answer

MongoDB is used for high volume data storage. MongoDB is one of many non-relational database technologies that came up in the mid-2000s for use in big data applications and other processing jobs. MongoDB is more faster than others because it allows users to query in a different manner.

In MongoDB, a record is a document, which is a data structure composed of field and value pairs. It is similar to JavaScript Object Notation objects

Q4. Is MongoDB better than Mysql? Explain
Answer

Most developers prefer MongoDB over MySQL because MongoDB allows them to build applications quicker, handle diverse data types, and efficiently manage applications. The flexible data model in MongoDB ensures database schema evolves with business needs.

Q5. When was MongoDB founded and why it is called MongoDB?
Answer

MongoDB was founded in 2007.

MongoDB originally dubbed “p”, the database was officially named MongoDB, with “Mongo” being short for the word humongous. After received many inputs about MongoDB, the company decided it scrap the Babble project and release MongoDB on its own as an open-source database platform in 2009.

Q6. What is the difference between Mysql and MongoDB? Explain
Answer
S.no MySQL MongoDB
1. Written in C, C++ Written in C, C++, JavaScript
2. Data stored in tables Data stored in JSON documents
3. Sses schemas for defining DB structure Schema-free
4. Development and maintenance by Oracle Corp. Development and maintenance by MongoDB, Inc.
Q7. Is MongoDB a relational database? Explain
Answer

No. MongoDB is a non-relational database. Instead, it is document-oriented. This means, instead of storing data in tables, similar to a relational database, it stores data in individual documents.

Q8. What are the difference between SQL and MongoDB? Explain
Answer
Q9. Explain "Namespace" in MongoDB.
Answer

In MongoDB, Binary Interchange and Structure Object Notation (BSON) objects are stored in a collection. The combination of collection and database names is called a namespace. All documents in MongoDB belong to a namespace.

Q10. What is index and how it is used in MongoDB?
Answer

An Index is a special structure in MongoDB. It stores a minimal portion of data belonging to a specific field in a form that is easy to traverse. This feature is ordered by the value of a field, which is pre-specified in the index.

The primary role of an Index is to offer great performance read operations for queries that are used frequently.

Related Article: Mysql Interview Questions

Development History of MongoDB

10gen software company started developing MongoDB in 2007 as one of the components of a platform as a service product. However, in 2009, the company moved to an open-source development model and changed its name to MongoDB Inc in 2013. The company made is first release public on February 2009.

Whether you are a fresher or an experienced MongoDB developer, these MongoDB interview questions and answers are all you need to succeed in your next interview.

Latest Version: The most recent version is 4.2.0, which was released in 13 August 2019.

Advantages

  • Easy to install and setup.
  • Schema-less database.
  • Capable of deriving a document-oriented data model
  • Secured and scalable.
  • Full technical support.

Are you looking to impress your boss and grab the upcoming promotion at work? Here are the most common MongoDB interview questions to help you do that.

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