Assumptions you are making: * everything is located physically close together (good luck reading from a DB table in Singapore from a service in Europe for ever

Assumptions you are making: * everything is located physically close together (good luck reading from a DB table in Singapore from a service in Europe for every request) * you have few enough client services that want to do this that the number of db connections does not become a problem (this is 100 by default for Postgres, you might need to tune this or deploy proxies, etc) * high availability is already taken care of (you don't want that one DB server to bring down everything in case of a failure)