> need to be replaceable with little to no effort. For instance, I don't want a new NoSQL platform, I want high-availability, managed, on-the-fly-scalable Postg

> need to be replaceable with little to no effort. For instance, I don't want a new NoSQL platform, I want high-availability, managed, on-the-fly-scalable Postgres. I don't think the latter is easily replaceable, though, either, since what you've described isn't Postgres, but, at best, something custom with a Postgres interface. For example, the Citus DBaaS offering may fit the bill, but what could easily replace it? A self-hosted version would fail at being "managed" (though this is a bit academic, since, presumably one would hire for that) and at being on-the-fly-scalable [1]. Is Amazon RDS a drop-in replacement, or does it have compatibility and performance edge case caveats? [1] I read that sort of "wish" often and have always found it borderline naive. That is, what I think they really mean is they just don't want to worry about scalability. The dominance of expensive, few-sizes-fits-all cloud infrastructure means that custom building an over-engineered database server, is not a practical option, and for most cases, neither short-notice scalability beyond that, nor runaway growth are a realistic problem.