28. Oktober: Alfons Kemper (TU München)

HyPer: one DBMS for all – High-Performance OLTP AND OLAP on Brawny Servers AND Wimpy Devices


Ever increasing main memory capacities and processors with multiple cores have fostered the development of database systems that process and store data solely in main memory. This talk presents HyPer, a high-performance hybrid OLTP&OLAP main memory database system we are building at TUM. Unlike other main memory database systems, HyPer aims at providing highest performance for both, OLTP AND OLAP workloads on brawny AND wimpy systems. OLAP query processing is separated from mission-critical OLTP transaction processing using an efficient virtual memory (VM) snapshotting mechanism. Platform-independent high-performance OLTP and OLAP is achieved by efficiently compiling transactions and queries into efficient target machine code. Even though the SQL-92 standard, a PL/SQL-like scripting language, and ACID-compliant transactions are supported, HyPer has a memory footprint of just a few megabytes. This talk highlights the following recent research efforts in the HyPer project: Snapshotting a transactional database, indexing, parallel multi-core query evaluation, multi-version concurrency control.

This is joint work with my colleague Prof. Thomas Neumann and the HyPer team: www.hyper-db.de.


Alfons Kemper's research field is database systems engineering. He explores ways to optimize information systems for operational and scientific applications as a way to combat the data explosion. His main areas of interest are optimization concepts for distributed information structures, data integration methods and, in particular, main memory-based database systems. Together with his colleague Thomas Neumann he leads the HyPer main-memory database project (hyper-db.com) at Technische Universität München. HyPer is one of the first hybrid database systems that offers high-performance OLTP as well as OLAP in parallel on the same database state.

After studying computer science at the University of Dortmund from 1977 to 1980, he moved to the University of Southern California, Los Angeles. While there, he obtained his Master of Science and doctorate. Upon his return to Germany, he completed his lecturer qualification at the University of Karlsruhe. His first professorship was conferred by RWTH Aachen. After many years as Director of the Chair of Database Systems at the University of Passau, TUM offered him a position in 2004. From 2006 to 2010, he was Dean of the Department of Informatics at TUM. His textbook on database systems, published by deGruyter and now in its 10th edition, is a best-seller in German-speaking countries and is used in most universities and colleges.