A central relational database management system (RDBMS) is operatively interconnected to one or more back-end database systems. A set of different query criteria specified for each of different types of queries for a mixed query workload is evaluated. At least one remote derived source of data requested by at least one of the different types of queries is dynamically created using at least one of the one or more back-end database systems that supports remote processing of the at least one of the different types of queries.