NoSQL (Not Only SQL database)


Introduction to NoSQL




NoSQL is an approach to database design that can accomodate a wide variety of data models, including key-value, document, columnar and graph formats. NoSQL, which stand for "not only SQL," is an alternative to traditional relational databases in which data is placed in tables and data schema is carefully designed before the database is built. NoSQL databases are especially useful for working with large sets of distributed data.
A NoSQL database includes simplicity of design, simpler horizontal scaling to clusters of machines and finer control over availability. The data structures used by NoSQL databases are different from those used by default in relational databases which makes some operations faster in NoSQL.

Advantages of NoSQL

  • High scalability
  • High availability

Disadvantages of NoSQL
  • Narrow focus
  • Open-source
  • Management challenge
  • GUI is not available
  • Large document size

Types of NoSQL database
  • Key value store
  • Tabular
  • Document based
When should NoSQL be used:
  1. When huge amount of data need to be stored and retrieved .
  2. The relationship between the data you store is not that important
  3. The data changing over time and is not structured.
  4. Support of Constraints and Joins is not required at database level
  5. The data is growing continuously and you need to scale the database regular to handle the data





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