Leader of the group Database Architectures: Stefan Manegold.

We, the Database Architectures (DA) research group of CWI, are well known as a top data systems research group, active in the broad area of data (management) systems and infrastructure for supporting data science. Our research group has a strong international reputation in academia and industry for pioneering column store technology, fast compression methods, vectorized query execution, on-line query-driven indexing (cracking), adaptive caching, and integration of statistical languages and analysis in database management systems.

We develop, distribute and maintain the MonetDB open-source system, and we have spawned multiple spin-off companies, including Data Distilleries, VectorWise and MonetDB Solutions. Our team also operates a self-built cluster, SciLens, that – unlike many other computer clusters – is bandwidth-optimized and thus better suited as a data-science infrastructure. We pride ourselves on revealing the real problems in our discipline and coming up with revolutionary solutions that are frequently ahead of their time.





No vacancies currently.


CWI Database Architecture researchers awarded with best paper runner up award at SSDBM

CWI Database Architecture researchers awarded with best paper runner up award at SSDBM

Researchers of CWI's Database Architecture group have been awarded with a best paper runner up award at 29th International Conference on Scientific and Statistical Database Management (SSDBM 2017) in Chicago. The researchers received the award for their paper 'Multi Hypothesis CSV-parsing' by authors Till Döhmen, Hannes Mühleisen and Peter Boncz.

CWI Database Architecture researchers awarded with best paper runner up award at SSDBM - Read More…

Current events

New national bi-weekly seminar: The Dutch Seminar on Data Systems Design (DSDSD)

  • 2021-03-26T16:15:00+01:00
  • 2021-03-26T17:45:00+01:00
March 26 Friday

Start: 2021-03-26 16:15:00+01:00 End: 2021-03-26 17:45:00+01:00

CWI has initiated a new national bi-weekly seminar called the Dutch Seminar on Data Systsems Design (DSDSD).

DSDSD is co-organized with TUE, TU Delft, and Uva and brings together researchers in data systems. The format is a 90-minute session with two talks, on Friday late afternoon; so DSDSD marks the start of weekend, but is time-wise also friendly for US based speakers. In each seminar, there is one invited speaker from abroad and one local speaker. There have been two seminars already, this Friday is the third.

The website is 
(here people can get on the mailing list, which distributes the zoom links) and DSDSD also tweets at

We have had two succesful seminars so far, the first with Semih Salihoglu (University of Waterloo) and Hannes Muehleisen (CWI) and the second with Andy Pavlo (Carnegie Mellon University) and Peter Boncz. Friday is the third, with Viktor Leis (University of Erlangen) and Sam Ansmink (CWI). In these seminars, we see 60-70 attendees so far. In the following weeks there will be talks also by TUE and TU Delft.


Associated Members



Current projects with external funding

  • RelationalAI-CWI Research Agreement ()
  • Actian Research Grant II (ACTIAN II)
  • Cross-Industry Predictive Maintenance Optimization Platform (CIMPLO)
  • Data Mining on High Volume Simulation Output (DAMIOSO)
  • Databricks CWI Research Agreement (Databricks)
  • Lokale Digitale Competentie centra (DCC) (DCC-NWO-I)
  • Facebook Research Grant (Facebook)
  • Research agreeement CWI - Databricks - vervolg contract (None)
  • Process mining for multi-objective online control (PROMIMOOC)
  • RelationalAI-CWI Research Grant Agreement (RelationalAI)
  • Structure-aware Querying & Information Retrieval on Evolving Large Graphs (SQIREL-GRAPHS)
  • Ursa-CWI Research Grant (Ursa)

Related partners

  • Actian Corporation
  • BMW Munich
  • Databricks
  • LIACS Institute
  • MonetDB B.V.
  • Neo Technology AB
  • OBI4wan B.V.
  • RelationalAI
  • Spinque
  • Tata Steel
  • WizeNoze B.V.
  • Facebook
  • Ursa Computing Inc.