MongoDB Interview Questions and Answers

Question 1

Whatis MongoDB?

Accepted Answer

MongoDB is a NoSQL document database that stores records as BSON documents instead of rows and tables.

Question 2

Whatis No SQL?

Accepted Answer

NoSQL refers to non-relational databases that do not rely on the fixed table-and-row model used by traditional SQL databases.

Question 3

What is the difference between No SQL&RDBMS?

Accepted Answer

RDBMS stores normalized data in tables with fixed schemas, while NoSQL databases like MongoDB store flexible documents and are optimized for different scaling and modeling needs.

Question 4

When to use RDBMS and when to use No SQL DB in your applications?

Accepted Answer

Use RDBMS when relationships, strict transactions, and reporting rules are central. Use NoSQL when the data shape changes often, scaling needs are high, or documents fit the domain naturally.

Question 5

What are Documentsand Collectionsin No SQL?

Accepted Answer

A document is a single record stored as key-value data, and a collection is a group of related documents.

Question 6

What are theadvantagesof No SQL over RDBMS/SQL databases?

Accepted Answer

NoSQL databases offer flexible schemas, easier horizontal scaling, and a document model that can match application objects more naturally.

Question 7

What are thedis-advantagesof No SQL as comparison to RDBMS databases?

Accepted Answer

NoSQL can make cross-document relationships, complex joins, and strict transactional reporting workflows harder than in a relational database.

Question 8

What is the difference between MongoDB Serverand MongoDB Database?

Accepted Answer

The MongoDB server is the running database service process, while a MongoDB database is a logical container inside that server holding collections.

MongoDB Interview Questions and Answers

MongoDB - Basics