The fourth international conference on Extending Data Base
Technology was held in Cambridge, UK, in March 1994. The
biannual EDBT has established itself as the premier European
database conference. It provides an international forum for
the presentation of new extensions to database technology
through research, development, and application. This volume
contains the scientific papers of the conference. Following
invited papers by C.M. Stone and A. Herbert, it contains 31
papers grouped into sections on object views, intelligent
user interface, distributed information servers, transaction
management, information systems design and evolution,
semantics of extended data models,accessing new media, join
algorithms, query optimization, and multimedia databases.