In one aspect, there is provided a method. The method may include loading, into a first address space of a primary server of a database, a metadata library of an application function library. The application function library may include an application function for performing operations on data held at the database. The metadata library may include a description of the application function. The primary server may determine, based on the metadata library, that executing a database query requires running the application function. The database query may be routed, based on the determination, to a secondary server of the database. The database query may be routed to trigger a loading the application function library into a second address space of the secondary server. Related methods and articles of manufacture are also provided.