Personal profile
Expertise
Bas Ketsman is a professor of Computer Science at the Vrije Universiteit Brussel. The focus of his research 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.
Education/Academic qualification
Postdoctoral Researcher, Swiss Federal Institute of Technology Lausanne
1 Apr 2018 → 30 Sept 2019
PhD Fellow, Research Foundation Flanders
1 Oct 2014 → 31 Mar 2018
PhD Researcher, Hasselt University
1 Oct 2013 → Dec 2017
Keywords
- free keyword
- Database Management Systems
- Database Theory
- Theoretical Computer Science
- Scalable Data Systems
- Query processing
- Database Transactions
- Query Optimization
- Distributed Databases
- Parallel Databases
Fingerprint
- 1 Similar Profiles
Collaborations and top research areas from the last five years
-
FWOTM1224: Formal approaches of evaluating join queries over distributed systems with optimality guarantees.
Aamer, H. (Mandate) & Ketsman, B. (Administrative Promotor)
1/10/24 → 30/09/27
Project: Fundamental
-
SRP92: SRP-Groeifinanciering: Real-Time Cross-Media Data Exploration and Analysis for Next Generation Knowledge Workers
Signer, B. (Administrative Promotor) & Ketsman, B. (Co-Promotor)
1/10/22 → 30/09/27
Project: Fundamental
-
FWOAL995: Allocating isolation levels to database transactions
Ketsman, B. (Administrative Promotor)
1/01/21 → 31/12/24
Project: Fundamental
-
FWOAL1008: Optimal Join Algorithms for Modern Distributed Data Systems
Ketsman, B. (Administrative Promotor)
1/01/21 → 31/12/24
Project: Fundamental
-
CONI715: Dutch-Belgian Database Day (Inschrijvingen)
Ketsman, B. (Administrative Promotor) & Mennes, L. (Collaborator)
9/11/20 → 31/12/20
Project: Fundamental
-
A Generalized CALM Theorem for Non-Deterministic Computation in Asynchronous Distributed Systems
Baccaert, T. & Ketsman, B., Jun 2026, In: Information Systems. 138, 27 p., 102691.Research output: Contribution to journal › Article › peer-review
File1 Downloads (Pure) -
Bounding the Makespan of Transaction Schedules
Baccaert, T., Vandevoort, B. & Ketsman, B., 18 Mar 2026, 29th International Conference on Database Theory: ICDT 2026, Tampere, Finland, March 24-27, 2026. ten Cate, B. & Funk, M. (eds.). Schloss Dagstuhl - Leibniz-Zentrum für Informatik, Vol. 365. p. 1-20 20 p. (Leibniz International Proceedings in Informatics (LIPIcs)).Research output: Chapter in Book/Report/Conference proceeding › Conference paper
Open Access -
Neither Cover nor Pack: Distributed Worst-Case: Optimality of Degree-2 Joins
Aamer, H., Hu, X. & Ketsman, B., 18 Mar 2026, The 29th International Conference on Database Theory (ICDT 2026). TenCate, B. & Funk, M. (eds.). Schloss Dagstuhl - Leibniz-Zentrum für Informatik, Vol. 365. p. 8:1-8:20 20 p. (Leibniz International Proceedings In Informatics).Research output: Chapter in Book/Report/Conference proceeding › Conference paper
Open Access -
Allocating Isolation Levels to Transactions in a Multiversion Setting
Vandevoort, B., Ketsman, B. & Neven, F., 14 May 2025, In: ACM Transactions on Database Systems. 50, 2, 24 p., 8.Research output: Contribution to journal › Article › peer-review
Open AccessFile43 Downloads (Pure) -
PAC: Computing Join Queries with Semi-Covers
Aamer, H. & Ketsman, B., 21 Mar 2025, 28th International Conference on Database Theory. Roy, S. & Kara, A. (eds.). Schloss Dagstuhl - Leibniz-Zentrum für Informatik, p. 6:1-6:20 20 p. (Leibniz International Proceedings in Informatics, LIPIcs; vol. 328).Research output: Chapter in Book/Report/Conference proceeding › Conference paper
Open Access
Datasets
-
Robustness Test Allocation Algorithm and Throughput experiments
Vandevoort, B. (Creator), Fekete, A. (Creator), Ketsman, B. (Creator), Neven, F. (Creator) & Vansummeren, S. (Creator), GitHub, 2025
https://github.com/UHasselt-DSI-Data-Systems-Lab/code-template-allocations-artifacts
Dataset
Prizes
-
2016 ACM SIGMOD Research Highlight Award
Ketsman, B. (Recipient), 2016
Prize: Prize (including medals and awards)
-
2023 ACM SIGMOD Research Highlight Award
Ketsman, B. (Recipient), 2023
Prize: Prize (including medals and awards)
-
2024 ACM SIGMOD Research Highlight Award
Ketsman, B. (Recipient), 2024
Prize: Prize (including medals and awards)
-
ACM SIGMOD 2019 Jim Gray Doctoral Dissertation Award Honorable Mention
Ketsman, B. (Recipient), 2019
Prize: Prize (including medals and awards)
-
EACTS Distinguished Dissertation Award
Ketsman, B. (Recipient), 2018
Prize: Prize (including medals and awards)
-
Neither Cover nor Pack: Distributed Worst-Case Optimality of Degree-2 Joins
Aamer, H. (Speaker), Hu, X. (Contributor) & Ketsman, B. (Contributor)
25 Mar 2026Activity: Talk or presentation › Talk or presentation at a conference
File -
Distributed Multi-way Joins: Worst-case Optimality
Aamer, H. (Speaker) & Ketsman, B. (Contributor)
26 Nov 2025Activity: Talk or presentation › Talk or presentation at a workshop/seminar
File -
PAC: Computing Join Queries with Semi-Covers
Aamer, H. (Speaker) & Ketsman, B. (Contributor)
25 Mar 2025Activity: Talk or presentation › Talk or presentation at a conference
File -
Optimizing Stratified Datalog with Count
Hechavarría Fajardo, F. (Speaker), Aamer, H. (Contributor) & Ketsman, B. (Contributor)
22 Nov 2024Activity: Talk or presentation › Talk or presentation at a workshop/seminar
File -
Optimizing Stratified Datalog with Count
Hechavarría Fajardo, F. (Speaker), Aamer, H. (Contributor) & Ketsman, B. (Contributor)
22 Nov 2024Activity: Talk or presentation › Talk or presentation at a workshop/seminar