Introduction to MongoDB

MongoDB is one of the most popular NO-SQL databases. The word is derived from humongous.

It’s a relatively new breed of database that has no concepts of tables, joins, foreign keys, transactions etc.

It is an open-source document-oriented database developed by MongoDB inc. in 2009.

So MongoDB doesn’t use table, row, column format to store data, rather it uses a storage format called BSON which is similar to JSON.

MongoDB is used for high volume data storage.

A simple MongoDB structure :


Key components of MongoDB Architecture


It is a physical container for data. We can store multiple databases on a single MongoDB server.


A set of key-value pairs is known as Document.

Basically, a record is called a document that is associated with a dynamic schema. The benefit of having a dynamic schema is that a document in a single collection does not have to possess the same structure or field.


This is a grouping of MongoDB documents.

Consider the collection as Table in RDBMS. The entire collection exists within a single database.

There is no schema when it’s come to a collection.


Why use MongoDB?

  • Document Oriented: Instead of multiple relation structure like RDBMS, MongoDB stores the data in document format. This makes MongoDB very flexible and adaptable to real business.
  • Indexing : Indexes can be created to improve performance of search within MongoDB.
  • MongoDB has exceptional scalability. It makes it easy to fetch the data and provides continuous and automatic integration. Along with these benefits, there are multiple reasons why you need MongoDB:
  • No downtime while the application is being scaled
  • Performs in-memory processing.
  • Text search.
  • Graph processing.
  • Global replication.

Difference between MongoDB and MySQL:

The query language is structured query language.The query language is JavaScript.
It represent data in tables and rows.It represents data as key-value pair.
Defining tables and columns is required.Defining the schema is not required.
It support joins.It does not support join.
It has a risk of SQL injection attacks.Because of it’s design, MongoDB is less of an attack.
MySQL is slower as compared to NoSQLMongoDB is faster.

Hope you like this!

Keep helping and happy 😄 coding