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A catch-all term describing database systems using various non-relational models. Such systems are usually engineered to be high-performance.

NoSQL is a catch-all term to describe various types of databases that use non-relational models. Some database paradigms grouped under the 'NoSQL' label include:

  • Key-Value pair and distributed key value store databases that store and retrieve a record based on a main or supplementary key.
  • Document databases that store a structured document based on a key, possibly with supplementary indexes.
  • Graph and object databases.

Commonly cited strengths of NoSQL systems include easy scale-out capabilities, flexibility with schema structure and making trade-offs against ACID properties (for example 'eventual consistency' semantics) for performance.

May also sometimes be referred to as Not Only SQL