Virtual Database Engine component for constructing transient and/or materialized views over ODBC/JDBC data source names (DSNs) that reference remote 3rd party relational databases and CSV files (local or HTTP accessible). The resulting views, like native Virtuoso tables/views, are then accessible for SQL and SPARQL based query access using HTTP, ODBC, JDBC, OLE-DB, ADO.NET, and XMLA.