Duration

2003

Description

We continuously performed research on different aspects of Parallel database systems (PDBS) between 1985 and 2001. Early work focused on concurrency and coherency control in Shared-Disk DBMS and closely coupled SD systems.

We then investigated various kinds of dynamic load balancing for multi-user query workloads. For dynamic load balancing we also considered Shared Nothing and a dynamic redistribution of data, particularly for parallel join processing. Here we developed new algorithms for dynamically determining the number of join queries and for their processor allocation (VLDB93, VLDB95). These decisions are made dependent on the current utilization of multiple resources, in particular, CPU and memory/disk. Performance evaluations were mostly done by simulations (partly trace-driven).

Lastly, within a DFG project (1997-2001) we also considered data allocation especially for SD-based data warehouses. A new data allocation tool, Warlock (Warehouse allocation to disk) was developed and demoed at VLDB 2001 in Rome, Italy (poster, demo).

 

Publikationen (32)

Dateien Cover Beschreibung Jahr
Beiträge zur dynamischen Lastbalancierung in parallelen Datenbanksystemen
Märtens, H.
Dissertation, Univ. Leipzig
2008
Dynamic Query Scheduling in Parallel Data Warehouses.
Märtens, H. ; Rahm, E. ; Stöhr, T.
Concurrency and Computation: Practice and Experience. Volume 15, Issue 11-12, Sep. 2003, Pages 1169 - 1190
2003
Dynamic Query Scheduling in Parallel Data Warehouses.
Märtens, H. ; Rahm, E. ; Stöhr, T.
Proc. EURO-PAR 2002, Springer-Verlag, LNCS, Paderborn, Aug. 2002
2002
Sysplex-Cluster-Technologien für Hochleistungs-Datenbanken.
Spruth, W. ; Rahm, E.
Datenbank-Spektrum Vol. 2, Heft 3, 16-26 (Mai 2002)
2002
A Classification of Skew Effects in Parallel Database Systems.
Märtens, H.
Proc. 7th Intl. Euro-Par Conference (Euro-Par 2001), LNCS, Springer-Verlag, Manchester, August 2001.
2001
Analytische Bestimmung einer Datenallokation für Parallele Data Warehouses.
Stöhr, T.
Proceedings of BTW01 (Datenbanksysteme für Büro, Technik und Wissenschaft), Oldenburg, March 2001. Springer-Verlag
2001
Multi-Dimensional Database Allocation for Parallel Data Warehouses
Stöhr, T. ; Märtens, H. ; Rahm, E.
Proc. 26th Intl. Conference on Very Large Databases (VLDB), Cairo, Egypt, Sep. 2000
2000
On Flexible Allocation of Index and Temporary Data in Parallel Database Systems.
Rahm, E. ; Märtens, H. ; Stöhr, T.
Proc. 8th Int. Workshop on High Performance Transaction Systems, Asilomar, Sep. 1999
1999
On Disk Allocation of Intermediate Query Results in Parallel Database Systems
Märtens, H.
Proceedings Euro-Par Conf., Toulouse, LNCS, Springer 1999
1999
Skew-Insensitive Join Processing in Shared-Disk Database Systems
Märtens, H.
Proc. Issues and Applications of Database Technology (IADT\'98), Berlin, 1998
1998