Hi,

You might like to check out the forthcoming asynchronous additions to the
Service Broker API:
https://docs.cloudfoundry.org/services/asynchronous-operations.html

It sounds like exactly what you're after.

Alternatively you could pre-provision a load of databases, and have your
broker maintain a pool of available ones. When each instance is destroyed,
you then clean it and return it to the pool only when it is back in a state
ready for someone else to use.

--
Regards,

Daniel Jones
EngineerBetter.com