• Document data store are used for storing, retrieving and managing document oriented information.

• Hierarchical data structures can be directly stored in document database.

• Document data store uses a key structure.

• Document path is used like a key to success the leaf values of a document tree structure.

• For eg.

Employee [id = '2300'] / Address / street / text ( )

• eg of document store:

Mongo DB, Couch DB, Couch Base.

• In column based store, data is stoned into columns and these columns are logically grouped into column families.

• splitting the data column size helps in faster retrieval of data

• example : Big Table, H Base, Hyper Table.