1. A computer-implemented method for use in connection with a federated database system including a database management system (DBMS) structured and programmed to manage access to database data stored in a constituent database, a catalogue, an accelerator system including a copy of a first portion of the database data and a single interface, the computer-implemented method comprising: maintaining, by the first DMBS, first metadata information in the catalogue, with the first metadata information being descriptive of a structure of a first data container type used to store at least some of the database data in the constituent database; detecting, by the DBMS, a trigger event for calculating a computational task; in response to the detection, creating, by the DBMS, an incomplete version of second metadata information, with the second metadata information being descriptive of a structure of a second data container type, with data containers of the second data container type being absent from the accelerator system, and with the incomplete version of the second metadata including a namespace for the second data container type, and with the incomplete version of the second metadata information lacking at least some structural information descriptive of the second data container type; receiving, by the DBMS and from the accelerator system, dynamically-identified information indicative of structural features the second data container type absent from the incomplete version of the second metadata information; and responsive to receipt of the dynamically-identified information, supplementing, by the DBMS, the incomplete version of the second metadata information with the dynamically-identified information to create a complete version of the second metadata information descriptive of a namespace and a data structure of the second data container type.