1. A federated in-memory database computing system (FIMDB) comprising: a plurality of interconnected local computing sites (LS), each installed with a local in-memory database instance (IMDB), which is configured to connect to the Federated In-Memory Database computing system (FIMDB); a central computing infrastructure, provided by a service provider (SP), that grants access to the local computing sites and to managed services that are managed by the service provider (SP), and that operates the local computing sites (LS) for execution on local data of each of the respective local computing sites (LS), wherein at least one of the service provider's managed services are subscribed to; a remote service directory that is exposed by the service provider (SP) and that is configured and automatically mounted to all of the local computing sites; one or more communication channels (LSG 1 , LSG 2 ), that connects local and remote computing sites of the federated in-memory database computing system (FIMDB); a configuration adjuster (CM), that configures hardware and software of the local computing sites (LS) and grants access to algorithms of the managed services, to be executed on the local computing sites (LS) in order to access services managed and operated by the service provider (SP) and execute them on the local computing hardware so that site-specific sensitive data of the local computing sites (LS) is stored and processed only locally and does not leave the local computing sites (LS), whereas sharable master data is processed and managed centrally by the service provider (SP).