Short Bio

I am an assistant professor in computer science at the Vrije Universiteit Brussel (VUB) and member of SOFT. I obtained a Ph.D. from Hasselt University in 2017 under the advice of Frank Neven and was a postdoctoral researcher at the Swiss Federal Institute of Technology in Lausanne (EPFL) where I worked with Christoph Koch. As a Ph.D. student, I did internships at the University of Washington in Seattle and the University of Wisconsin in Madison.

My main research focus is on various aspects of modern, scalable big data systems, including query processing with formal optimality guarantees, high-available transaction processing, and querying of linked data. This research has been awarded best paper awards at the ACM PODS Conference (the year 2014 and 2015), the 2018 EATCS distinguished dissertation award, and also the 2019 SIGMOD Jim Gray Doctoral Dissertation Award Honorable Mention.

I'm actively looking for PhD and Master students interested in data systems, applications and/or theory. Send me an e-mail if you are interested in working with me.

Publications

  • PODS 2020
    Bas Ketsman, Christoph Koch, Frank Neven, Brecht Vandevoort. Deciding Robustness for Lower SQL Isolation Levels. In: Proceedings of the 39th ACM SIGMOD-SIGACT-SIGAI Symposium on Principles of Database Systems. 2020. DOI:10.1145/3375395.3387655.
    • Invited to TODS, collecting the best of PODS 2020
  • ICDT 2020
    Bas Ketsman, Christoph Koch. Datalog with Negation and Monotonicity. In: 22th International Conference on Database Theory. 2020. DOI:10.4230/LIPIcs.ICDT.2020.19.
  • TOCS 2020
    Bas Ketsman, Aws Albarghouthi, Paraschos Koutris. Distribution Policies for Datalog. In: Theory of Computing Systems - Special Issue on Database Theory. 2020. Volume 64 Issue No . DOI:10.1007/s00224-019-09959-3.
  • SIGMOD 2019
    Bas Ketsman. Formal Approaches to Querying Big Data in Shared-Nothing Systems. In: Proceedings of the 2019 International Conference on Management of Data. 2019. DOI:10.1145/3299869.3328524.
  • TOCL 2019
    Gaetano Geck, Bas Ketsman, Frank Neven, Thomas Schwentick. Parallel-Correctness and Containment for Conjunctive Queries with Union and Negation. In: Transactions on Computational Logic. 2019. Volume 20 Issue 3 No 18. DOI:10.1145/3329120.
  • ICDT 2018
    Bas Ketsman, Frank Neven, Brecht Vandevoort. Parallel-Correctness and Transferability for Conjunctive Queries under Bag Semantics. In: 21st International Conference on Database Theory. 2018. DOI:10.4230/LIPIcs.ICDT.2018.18.
  • ICDT 2018
    Bas Ketsman, Aws Albarghouthi, Paraschos Koutris. Distribution Policies for Datalog. In: 21st International Conference on Database Theory. 2018. DOI:10.4230/LIPIcs.ICDT.2018.17.
    • Invited to ToCS, collecting the best of ICDT 2018
  • TOCS 2017
    Bas Ketsman, Frank Neven. Optimal Broadcasting Strategies for Conjunctive Queries over Distributed Data. In: Theory of Computing Systems. 2017. Volume 61 No 1. DOI:10.1007/s00224-016-9719-8.
  • TOCL 2017
    Tom Ameloot, Bas Ketsman, Frank Neven, Daniel Zinn. Datalog Queries Distributing over Components. In: ACM Transactions on Computational Logic. 2017. Volume 18 Issue 1 No 5. DOI:10.1145/3022743.
  • CACM 2017
    Tom Ameloot, Gaetano Geck, Bas Ketsman, Frank Neven, Thomas Schwentick. Reasoning on Data Partitioning for Single-Round Multi-Join Evaluation in Massively Parallel Systems. In: Communications of the ACM. 2017. Volume 60 No 3. DOI:10.1145/3041063.
  • PODS 2017
    Bas Ketsman, Dan Suciu. A Worst-Case Optimal Multi-Round Algorithm for Parallel Computation of Conjunctive Queries. In: Proceedings of the 36th ACM SIGMOD-SIGACT-SIGAI Symposium on Principles of Database Systems. 2017. DOI:10.1145/3034786.3034788.
  • JACM 2017
    Tom Ameloot, Gaetano Geck, Bas Ketsman, Frank Neven, Thomas Schwentick. Parallel-Correctness and Transferability for Conjunctive Queries. In: Journal of the ACM. 2017. Volume 64 Issue 5 No 36. DOI:10.1145/3106412.
  • PhD Dissertation
    Bas Ketsman. Asynchronous Adventures: Formal Approaches to Querying Big Data in Shared-Nothing Systems. Hasselt University & transnational University of Limburg. 2017. Advisor: Frank Neven
  • ICDT 2016
    Gaetano Geck, Bas Ketsman, Frank Neven, Thomas Schwentick. Parallel-Correctness and Containment for Conjunctive Queries with Union and Negation. In: 19th International Conference on Database Theory. 2016. DOI:10.4230/LIPIcs.ICDT.2016.9.
  • ACM TODS 2016
    Tom Ameloot, Bas Ketsman, Frank Neven, Daniel Zinn. Weaker Forms of Monotonicity for Declarative Networking: a more fine-grained answer to the CALM-conjecture. In: ACM Transactions on Database Systems. 2016. Volume 40 Issue 4. DOI:10.1145/2809784.
  • SIGMOD Record 2016
    Tom Ameloot, Gaetano Geck, Bas Ketsman, Frank Neven, Thomas Schwentick. Data partitioning for single-round multi-join evaluation in massively parallel systems. In: SIGMOD Record - Special Issue on 2015 ACM SIGMOD Research Highlights. 2016. Volume 45 Issue 1. DOI:10.1145/2949741.2949750.
  • PODS 2015
    Tom Ameloot, Gaetano Geck, Bas Ketsman, Frank Neven, Thomas Schwentick. Parallel-Correctness and Transferability for Conjunctive Queries. In: Proceedings of the 34th ACM SIGMOD-SIGACT-SIGAI Symposium on Principles of Database Systems. 2015. DOI:10.1145/2745754.2745759.
  • ICDT 2015
    Bas Ketsman, Frank Neven. Optimal Broadcasting Strategies for Conjunctive Queries over Distributed Data. In: 18th International Conference on Database Theory. 2015. DOI:10.4230/LIPIcs.ICDT.2015.291.
    • Invited to ToCS, collecting the best of ICDT 2015
  • ICDT 2015
    Tom Ameloot, Bas Ketsman, Frank Neven, Daniel Zinn. Datalog Queries Distributing over Components. In: 18th International Conference on Database Theory. 2015. DOI:10.4230/LIPIcs.ICDT.2015.308.
  • PODS 2014
    Tom Ameloot, Bas Ketsman, Frank Neven, Daniel Zinn. Weaker Forms of Monotonicity for Declarative Networking: a more fine-grained answer to the CALM-conjecture. In: Proceedings of the 33rd ACM SIGMOD-SIGACT-SIGAI Symposium on Principles of Database Systems. 2014. DOI:10.1145/2594538.2594541.
  • Master's Thesis
    Bas Ketsman. Conjunctive Regular Path Queries in MapReduce. Hasselt University. 2013.

Teaching & Services

Teaching at VUB

  • Databases - Master (spring 2020,2021)
  • Databanken - Bachelor (spring 2020,2021)
  • Scalable Data Management Systems - Master (spring 2020, autumn 2020)
  • Open Information Systems - Master (autumn 2020, with Bart Bogaerts)

Conference and Workshop Organization

International Services

  • PC membership
    PODS (2020), ICDT (2020)
  • Other reviewing
    PODS (2017,2018), VLDBJ (2018), TOCS (2018), ACM TODS (2015, 2016), Elsevier IS (2015)

Talks

  • ICDT 2020
    Datalog with Negation and Monotonicity. International Conference on Database Theory. Copenhagen, Denmark [online talk due to the COVID-19 pandemy]. 30 March 2020.
  • UC San Diego, 2018
    Datalog, Coordination and Monotonicity. University of California. San Diego, CA, USA. 4 October 2018.
  • ICDT 2018
    Distribution Policies for Datalog. International Conference on Database Theory. Vienna, Austria. 26 March 2018.
  • Stanford University, 2017
    Coordination-free query evaluation and multi-query optimization in parallel and distributed systems. Stanford University. Stanford, CA, USA. 18 October 2017.
  • UC Berkeley, 2017
    Coordination-free query evaluation and multi-query optimization in parallel and distributed systems. University of California. Berkeley, CA, USA. 14 August 2017.
  • PODS, 2017
    A Worst-Case Optimal Multi-Round Algorithm for Parallel Computation of Conjunctive Queries. Principles of Database Systems Conference. Chicago, IL, USA. 17 May 2017.
  • UW Madison, 2017
    A Worst-Case Optimal Multi-Round Algorithm for Parallel Computation of Conjunctive Queries. University of Wisconsin. Madison, WI, USA. 10 April 2017.
  • DBDBD, 2016
    A Worst-Case Optimal Multi-Round Algorithm for Parallel Computation of Conjunctive Queries on Graphs. Dutch Belgian Database Day. Mons, Belgium. 28 October 2016.
  • UW Seattle, 2016
    Single-Round Multi-Join Evaluation. University of Washington. Seattle, WA, USA. 8 April 2016.
  • PODS, 2015
    Parallel-Correctness and Transferability for Conjunctive Queries. Principles of Database Systems Conference. Melbourne, VIC, Australia. 1 June 2015.
  • ICDT, 2015
    Optimal Broadcasting Strategies for Conjunctive Queries over Distributed Data. International Conference on Database Theory. Brussels, Belgium. 25 March 2015.
  • PODS, 2014
    Weaker Forms of Monotonicity for Declarative Networking: a more fine-grained answer to the CALM-conjecture. Principles of Database Systems Conference. Snowbird, Utah, USA. 22 June 2014.
  • DBDBD, 2014
    How to Stay CALM While Seeing What is not There?. Dutch Belgian Database Day. Antwerp, Belgium. 17 October 2014.