Advantages of MongoDB over RDBMS:-

1 Schema less:

MongoDB is a document database in which one collection holds different documents. Number of fields, content and size of the document can differ from one document to another.

2 Structure of a single object is clear.

3 No complex joins.

4 Deep query-ability-

MongoDB supports dynamic queries on documents using a document-based query language that's nearly as powerful as SQL.

5 Tuning.

6 Ease of scale-out

MongoDB is easy to scale.

7 Conversion/mapping of application objects to database objects not needed.

8 Uses internal memory for storing the (windowed) working set, enabling faster access of data.