CA: Ensured with replicas. SQL, Neo4J.
CP: Data is sacrosanct. Even 1 node down-error.
AP: Write to one node is fine. Even with a node is down. Quorum in Cassandra-increases C.
CA NoSQL: Berkeley, Redis (in-memory): High performance owing to no schema. Immediately consistent & available: only 1 copy. Async replica & failover.
NoSQL relationships: Usually no.
Graph db: relationships query faster.
NoSQL is fundamentally sharding.
Availability: Want to write? If node not available, error. Such as with CP.
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