No Sql
The group of
NoSQLdatabases 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) |