... its ability to: Join data from local tables and remote data sources, as if all the data is stored locally in the federated database. Update data in relational data sources, as if the data ... federated server requests for the data-type mappings of a data source. Each wrapper contains default data-type mappings. For relational wrappers, data-type mappings created by the administrator ... federated database To users and applications, data sources accessed using WebSphere II appear to belong to a single federated DB2 database managed by a federated database server. A system catalog...