Motivations behind NoSQL [closed]

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What are the main motivations behind the invention of NoSQL Databases?

Your point of view would help my research on NoSQL databases.

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"The no:sql(east) conference 2009 in Atlanta had a strong influence on the NoSQL debate. Its self-conception was "a conference of non-relational data stores", and its motto was "select fun, profit from real_world where relational=false;" (1)

"The most common interpretation of "NoSQL" is "non-relational", although NoSQL is not meant as anti-RDBMS, but emphasizes the advantages of Key-Value Stores, Document Databases, and Graph Databases". (1)

These data stores may not require fixed table schemas, and usually avoid join operations and typically scale horizontally.

This blog in addition to the Wikipedia link, might help you to form an opinion.