eg on RDS, they'll give you instances with 1TB of RAM, eg a `db.r6idn.32xlarge`, at the nice price of $75/hr ($54k/mo). Not to mention that, in a microservices architecture, assuming you're not sharing a database, you might be multiplying that figure out a few times.

So just because it's possible for it to fit in RAM doesn't mean it's economical. RAM isn't exactly getting exponentially cheaper or more spacious anymore. The hope was flash memory would be the solution, but not sure how far that's getting these days.