VoltDB lets you keep transactions, and the strong consistency lets you enforce many constraints (though some in stored procedure code). Cluster-wide uniqueness

VoltDB lets you keep transactions, and the strong consistency lets you enforce many constraints (though some in stored procedure code). Cluster-wide uniqueness has some limitations, but there are lots of tools we offer that are way better than nothing. Much of what you get in a relational DB, you can keep, and you can scale.