No Sql

The group of NoSQL databases collectively known as aggregate stores (term coined by Martin Fowler) includes key-value stores, wide-column stores and document stores.

• Azure Cosmos DB
• DocumentDB
• Mongo
• Graph databases
• acid vs base & CAP theorem
• ranking
• relate with graph databases

Type	description	example
KV	large, distributed hashmap data structures that store and retrieve values organized by identifiers known as keys	Redis
WC		Apache Cassandra
DOC	natural hierarchies of structured documents	MongoDb

trait	pro / con
data relationship insight	KV ✖
high availability	KV ✔
horizontal scaling	DOC ✖ explicit sharding plan
scale	KV ✔, WC ✔
sets of information for several records	KV ✖ (mapreduce+latency)

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