[Thaxll]

Many things that I don't agree with: https://github.com/cockroachdb/cockroach/

MySQL: Weak consistency

Cassandra: No availability or weak consistency with datacenter failure

[teraflop]

MySQL provides strong consistency when run on a single machine, but that breaks down when you handle failover using asynchronous replication between DCs.

[eksith]

To add to this "Postgres: Limited scalability". I wish someone told us before we ticked over to 31TB... 5 Months ago.