Thread by @allthingsclouds

What is NoSQL?
*NoSQL databases are non tabular, and store data differently than relational tables
*NoSQL databases come in a variety of types based on their data model
* The main types are document, key-value, wide-column, and graph #cloudcomputing #NoSQL 1/n

non-relational database provides a mechanism for storage and retrieval of data that is modeled in means other than the tabular relations used in relational databases 2/n

A common misconception is that NoSQL databases or non-relational databases don’t store relationship data well. NoSQL databases can store relationship data—they just store it differently than relational databases 3/n

*NoSQL data models allow related data to be nested within a single data structure.
* NoSQL databases emerged in the late 2000s as the cost of storage dramatically decreased 3/n

*Gone were the days of needing to create a complex, difficult-to-manage data model simply for the purposes of reducing data duplication
* Developers were becoming the primary cost of software development, so NoSQL databases optimized for developer productivity 3/n

*Many NoSQL stores compromise consistency in favor of availability, partition tolerance, and speed
* most NoSQL databases offer a concept of "eventual consistency", in which database changes are propagated to all nodes "eventually" (typically within milliseconds) 3/n

There are various ways to classify NoSQL databases:
*Wide column: Azure Cosmos DB, Accumulo, Cassandra, Scylla, HBase
*Document: Azure Cosmos DB, Apache CouchDB, ArangoDB, BaseX, Clusterpoint, Couchbase, eXist-db, IBM Domino, MarkLogic, MongoDB, OrientDB, Qizx, RethinkDB 3/n

There are various ways to classify NoSQL databases:
*Key–value: Azure Cosmos DB, Aerospike, Apache Ignite, ArangoDB, Berkeley DB, Couchbase, Dynamo, FoundationDB, InfinityDB
* Graph: Azure Cosmos DB 3/3

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