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[Institut fuer Informatik] [Leerraum] [Humboldt-Universitaet zu Berlin]

Prof. Johann-Christoph Freytag

Adresse: Institut für Informatik
Humboldt-Universität zu Berlin
Unter den Linden 6
D-10099 Berlin
Sitz: Rudower Chaussee 25
D-12489 Berlin
Raum: 4.203
Telefon: +49 30 2093-3009
Fax: +49 30 2093-3010
EMail: freytag[at]dbis.informatik.hu-berlin.de (PGP)


Query optimization and query processing in object-relational DBMSs (ORDBMSs)

Privacy support in database systems and information systems

Data quality in databases

Semantic Web and database systems

Databases and Cloud Computing

Applications using DBMS technology such as Bioinformatics


As the Professor for Databases and Information Systems at the Humboldt-Universität zu Berlin, I am committed to provide my assistants and my students with the best possible teaching and research environment (see also my teaching guidelines). This commitment includes providing intellectual support, finding necessary resources, and opening up opportunities for further growth. When cooperating with other (academic or industrial) partners I am committed to be a reliable and responsive partner expecting the necessary respect as I respect others for the values and goals they stand for.

Furthermore, I am committed to challenge continuously my assistants and students in their work with the ultimate goal to perform outstanding research leading to outstanding results. I strongly believe that only active participation in the research community by publishing research results and ideas provides the stimulating working environment necessary for excellent research.

Professional Activities

VLDB: 1995, 1998, 2001, 2002, 2004, 2005, 2006, 2007, 2008,2009, 2010, 2011, 2012, 2018 (Area Chair)

SIGMOD: 1994, 2001 (industrial track), 2005, 2007, 2008, 2011, 2014

IEEE ICDE: 1995, 1997 (vice-chair), 2001, 2002, 2003, 2005, 2007, 2011, 2013, 2014, 2016 (area chair)

Comad: 1994, 2000, 2002

SSDBM: 2000, 2001, 2002

EDBT: 1990, 2006, 2008, 2015

BTW: 1997, 2005, 2007, 2013

Various national and international workshops

  • Reviewer for various journals including ACM TODS, ACM JACM, PVLDB and the VLDB Journal
  • Reviewer for the Deutsche Forschungsgemeinschaft (DFG), EU (various programs)
  • Head ("Sprecher") of the GI-Fachbereich Datenbanken und Informationssysteme (Gesellschaft für Informatik - German interest group in computer science) in Germany (2007 - 2015)
  • Member of the editorial board of the Journal Datenbankspektrum published by d-punkt Verlag
  • Member of the Editorial Board for the Springer Book Series on Data-centric Systems and Applications
  • Member of the Editorial Board of the Springer Journal Computer Science - Research and Development
  • Visiting Scientist at IBM Silicon Valley Laboratory, San Jose, CA, Summer 2001
  • Visiting Scientist at IBM Almaden Research Center, San Jose, CA, Winter 1997/1998
  • Visiting Scientist at Microsoft Research, Redmond, Washington, February/March 2002
  • Visiting Scientist at Microsoft Research, Redmond, Washington, February-May 2005
  • Visiting Scientist at Microsoft Research, Redmond, Washington, February-April 2007
  • Visiting Scientist at Microsoft SQL Server Development Group, Redmond, Washington, February-April 2008
  • Visiting Faculty at Harvard University, MA, February-April 2009
  • Co-Organizer of the GI-Workshop " E-Commerce: System Support Dealing with Data and Processes in Distributed Application Environments" at the annual GI-conference 2001 in Vienna
  • Organizer of the Workshop on Databases and Data Integration in Genome Research, February 2002 (supported by IBM)
  • Organizer of the following Dagstuhl Workshops:

Query Processing in Object-Oriented, Complex Object, and Nested Relation Databases (with D. Maier and G. Vossen), June 1991

Information and Process Integration: A Life Science Perspective (with R. Apweiler, T. Etzold, C. Goble, P. Schwarz),  January 2003

Perspectives Workshop: Data Mining: The Next Generation (together with R. Agrawal and R. Ramakrishnan), July 2004

Managing and Mining Genome Information: Frontiers in Bioinformatics (with J. Blazewicz and M. Vingron), November 2005

Federated Semantic Data Management (with Olaf Hartig, Linköping University, SE) and Maria-Esther Vidal, Universidad S. Bolivar – Caracas, VE, June 2017

Research Participation

  • Co-initiator of the BMBF funded project "GEoMultiSens"
  • Co-initiator of the Forschergruppe Stratosphere funded by the DFG (2006 - 2014)
  • Board member and co-initiator of the Graduate School "METRIK" funded by the DFG (2006 - )
  • Board member and co-initiator of the Graduate School "SOAMED" funded by the DFG (2010 - 2019)
  • Co-initiator of the EU funde project "PRECIOSA" funded by the DFG (2010 -2012 )
  • Board member and co-initiator of the BMBF-funded project "INTERVAL" funded by the DFG (2003 - 2007)
  • Member of the Coordination Board for the "Berlin Center for Genome Based Bioinformatics" (BCB) (2000 - 2005)
  • Board member and co-initiator of the Graduate School "Distributed Information Systems" funded by the DFG (1997-2006)
  • Leader of the DFG funded project "Anfragebearbeitung und Optimierung für parallele relationale Datenbanksysteme" (1996 - 2005)



Helpful links how to publish and how to perform research successfully

Book by D. Maier: Theory of Relational Databases (Front, Content, Ch1, Ch2, Ch3, Ch4, Ch5, Ch6, Ch7, Ch8, Ch9, Ch10, Ch11, Ch12, Ch13, Ch14, Ch15, Bib, Index)

Book by Philip A. Bernstein, Vassos Hadzilacos, and Nathan Goodman: Concurrency Control and Recovery In Database Systems (Lokal: Preface, Glossary, Content, Ch1, Ch2, Ch3, Ch4, Ch5, Ch6, Ch7, Ch8, Appendix, Index, Bib)


List of publications (For a complete list of publications - especially for 1993 and earlier - please access the DBLP Bibliography Server)

[aktiver Punkt]  Prof. Johann-Christoph Freytag

[Punkt]  Saliha Irem Besik

[Punkt]  Galina Greil

[Punkt]  Daniel Janusz

[Punkt]  Nicolas Miranda

[Punkt]  Mathias Peters

[Punkt]  Jochen Taeschner

[Punkt]  Thomas Morgenstern