Prof. Dr. Felix Naumann

Sebastian Kruse

former member

Research Interests

  • Data profiling
  • Distributed systems
  • Map/Reduce frameworks
  • Query optimization
  • Cross-platform/polyglot data processing



Master's Theses

  • Estimating Metadata of Query Results using Histograms (Cathleen Ramson, 2014)
  • Quicker Ways of Doing Fewer Things: Improved Index Structures and Algorithms for Data Profiling (Jakob Zwiener, 2015)
  • Methods of Denial Constraint Discovery (Tobias Bleifuß, 2016)
  • Optimizing Cross-Platform Iterations on 
    the Rheem Platform (Jonas Kemper, ongoing)


Master Projects

Bachelor Projects

Guest Lectures

Professional Activities



Scaling Out the Discovery of Inclusion Dependencies

Kruse, Sebastian; Papenbrock, Thorsten; Naumann, Felix in Proceedings of the conference on Database Systems for Business, Technology, and Web (BTW) page 445-454 . 2015 .

Inclusion dependencies are among the most important database dependencies. In addition to their most prominent application – foreign key discovery – inclusion dependencies are an important input to data integration, query optimization, and schema redesign. With their discovery being a recurring data profiling task, previous research has proposed different algorithms to discover all inclusion dependencies within a given dataset. However, none of the proposed algorithms is designed to scale out, i.e., none can be distributed across multiple nodes in a computer cluster to increase the performance. So on large datasets with many inclusion dependencies, these algorithms can take days to complete, even on high-performance computers. We introduce SINDY, an algorithm that efficiently discovers all unary inclusion dependencies of a given relational dataset in a distributed fashion and that is not tied to main memory requirements. We give a practical implementation of SINDY that builds upon the map-reduce-style framework Stratosphere and conduct several experiments showing that SINDY can process huge datasets by several factors faster than its competitors while scaling with the number of cluster nodes.
Scaling Out the Discovery... - Download
Further Information
Tags discovery  disctributed  inclusion_dependencies  isg  parallel  profiling