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Why NoSQL?

The Relational Databases have the following challenges:

  1. Not good for Petabytes of data with variety of data types (eg. images, videos, text)
  2. Cannot scale for large data volume
  3. Cannot scale-up, limited by memory and CPU capabilities
  4. Cannot scale-out, limited by cache dependent Read and Write operations
  5. Sharding  causes operational problems
  6. Changing Table structure is a big challenge
  7. Consistency limits the scalability in RDBMS
 
Compared to RDBMS, NoSQL DBs are more scalable and provide better performance. NoSQL databases address the challenges that the RDBMS does not provide in case of below mentioned situations.

  1. A scale-out, shared-nothing architecture, capable of running on a large number of nodes
  2. A non-locking concurrency control mechanism so that real-time reads will not conflict writes
  3. Scalable replication and distribution – thousands of machines with distributed data
  4. An architecture providing higher performance per node than RDBMS
  5. Schema-less data model

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