Thank you for your response!

You are right in that single database is the easiest and most natural form 
of application. I think people reach for services way too early so don't 
expect an impassioned defense of SOA from me. That said, I think that 
multiple database is a feature that will have buy in for much the same 
reason SOA has buy in. Some people can't handle all their requests with a 
single database. For reference, this is Eileen's keynote:

https://youtu.be/8evXWvM4oXM?t=1130

Basically, think of this as SOA, but the applications are engines, and 
instead of communicating via HTTP, the applications communicate via method 
calls.

On Wednesday, June 20, 2018 at 11:03:19 AM UTC-4, James Adam wrote:
>
> It’s an interesting idea, but I’m not sure that a lot of people will need 
> or even want to isolate engines into their own databases — in most cases, 
> I’d expect people to want to link their application models to engine models 
> (e.g. users to posts), which means they’d naturally sit in the same 
> database.
>
>
> I think you’ll need to make a very clear use-case for separating databases 
> on a per-engine basis to get traction.
>

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