MongoDB - A Document-Oriented database (Part 1)

Introduction
MongoDB is a powerful, flexible and salable data store. It have some features such as secondary indexes, range queries, sorting as well as built in support for MapReduce-style aggregation.
MongoDB is a document oriented database, not a relational one.
Document oriented database have more features than relational databases. The basic idea is to replace the concept of a 'row' with more flexible model 'document'.  Also mongodb is schema free database, No joins and lot easier to handle data.

• Document is basic unit of data in MongoDB, like row in a relational database.
• Collection is like a table in relational database.
• MongoDB comes with a simple but most powerful Javascript shell .
• Every documet has a special key called "_id".

Setup MongoDB

• Download the appropriate version : http://www.mongodb.org/downloads
• Windows version
• Extract downloaded zip file. (Ex: C:\my_mongo_dir)
• Go to bin directory and start the mongodb server by double clicking  the mongod.exe (Before that create data/db folder inside the C:\ drive) 
• After that start the mongo shell by double clicking the mongo.exe (It will start a shell and you can type commands)
• Linux Version
• Extract downloaded tar file.
• Create /data/db in root path.
• ./mongod to start the mongo server.
• ./mongo to start the mongo shell.

In the next part I'll show some basic commands such as creating, remove and update documents and collections in mongoDB.