NoSQL databases are the 21’st century databases created to defeat the disadvantages of RDBMS. The objective of
NoSQL is to give versatility, accessibility and meet different necessities of distributed computing.The main motivations for
NoSQL databases systems are achieving scalability and fail over needs. In the vast majority of the NoSQL data set frameworks,
information is parceled and repeated across numerous hubs. Innately, the majority of them utilize either Google's MapReduce or
Hadoop Distributed File System or Hadoop MapReduce for information assortment. Cassandra, HBase and MongoDB are for
the most part utilized and they can be named as the agent of NoSQL world.
