Most Common NoSQL Databases

1. Key-value pair NoSQL databases

• Most basic type of NoSQL database
• Two main concepts are Keys and Values
• Keys are nothing but identifiers through which you can refer values
• Values are values corresponding to a key
• Values can be like string, blob, image etc.
• Some database support buckets to provide separate placeholder to logically separate data. For e.g. account data goes to account bucket, orders go to order bucket

• Databases: Oracle NoSQL, Redis, Cassandra

      2. Document NoSQL Database

• Document database are similar to key-value databases with one different that they treat value as document of various types like JSON, XML etc.

For e.g.

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{

“orderno”:”12345”,

“orderdate”:”08-10-2015”

}

• Values don’t need to be in predefined format.
• It can offers API to run against values to give custom results. For e.g. you can make query like give me order which was placed on date 08-10-2015
• Databases:  CouchDB, MongoDB

     3. Column style NoSQL databases

• Somewhat similar to relational databases as it stores value in columns.
• Little bit more complex than Key-value database or document store databases.
• Column have Name and Value

• One or more columns make Row
• Rows can have different columns
• Don’t need to have predefined schema
• Databases:  HBase , Cassandra

     4. Graph NoSQL Databases

• Little complex than other NoSQL databases
• Uses concept from graph theory called vertices and edges or nodes/relations to represent data
• Node is nothing but an object which have set of attributes
• Relationship is link between two nodes
• Attributes/Properties are the piece of information that relates two nodes
• Databases: Neo4J, OrientDB