MongoDB is a cross – platform , document oriented database that provides high performance, high availability and easy scalability MongoDB works on concept of collection and document. 


Database is physical container for collections. Each database gets its own set of files on the file system. A single MongoDB server typically has multiple interface database. 


Collection is a group of MongoDB  document. It is on equivalent to RDBMS table. A collection exists within a single database collections do not  enforce a schema document within a collection can have different fields. Document A document is a set of key – value pair. Document have dynamic schema. Dynamic schema means that document in the same collection do not need to have the same set of fields and structure and common fields in a collection  document may hold different types of data. 

Advantage of MongoDB over RDBMS 

Schema less:- MongoDB is a document database i which one collection  holds different documents in which one collection holds different documents number of fields, content and size of the document can differ from one document to another. 

Structure of a single object is clear 

No complex join 

Deep Query – ability MongoDb supports Dynamic queries on document using a document based Query language that nearly as powerfull as SQL 



 Why Use MongoDB 

Document Oriented Storage 

Index on any attribute 

Replication and availability 

Auto – sharding 

Rich Queries 

Fast in place updates 

Professional support by MongoDB

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