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Parallel Database Systems / Shared Disk

We continously performed research on different aspects of Parallel database systems (PDBS) between 1985 and 2001. Early work focussed 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).

Selected Publications:



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publication iconMärtens, H.
Beiträge zur dynamischen Lastbalancierung in parallelen Datenbanksystemen
Dissertation, Univ. Leipzig
2008
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Märtens, H.; Rahm, E.; Stöhr, T.
Dynamic Query Scheduling in Parallel Data Warehouses.
Concurrency and Computation: Practice and Experience. Volume 15, Issue 11-12, Sep. 2003, Pages 1169 - 1190
2003
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Märtens, H.; Rahm, E.; Stöhr, T.
Dynamic Query Scheduling in Parallel Data Warehouses.
Proc. EURO-PAR 2002, Springer-Verlag, LNCS, Paderborn, Aug. 2002
2002
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Spruth, W., Rahm, E.
Sysplex-Cluster-Technologien für Hochleistungs-Datenbanken.
Datenbank-Spektrum Vol. 2, Heft 3, 16-26 (Mai 2002)
2002

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Märtens, H.
A Classification of Skew Effects in Parallel Database Systems.
Proc. 7th Intl. Euro-Par Conference (Euro-Par 2001), LNCS, Springer-Verlag, Manchester, August 2001.
2001

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Stöhr, T.
Analytische Bestimmung einer Datenallokation für Parallele Data Warehouses.
Proceedings of BTW01 (Datenbanksysteme für Büro, Technik und Wissenschaft), Oldenburg, March 2001. Springer-Verlag
2001
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Stöhr, T.; Rahm, E.
Warlock: A Data Allocation Tool for Parallel Warehouses.
Proc. 27th Intl. Conference on Very Large Databases (VLDB), Rome, Italy, Sep. 2001 (software demonstration)
2001
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Stöhr, T.; Märtens, H.; Rahm, E.
Multi-Dimensional Database Allocation for Parallel Data Warehouses
Proc. 26th Intl. Conference on Very Large Databases (VLDB), Cairo, Egypt, Sep. 2000
2000

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Märtens, H.
On Disk Allocation of Intermediate Query Results in Parallel Database Systems
Proceedings Euro-Par Conf., Toulouse, LNCS, Springer 1999
1999
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Rahm, E.; Märtens, H.; Stöhr, T.
On Flexible Allocation of Index and Temporary Data in Parallel Database Systems.
Proc. 8th Int. Workshop on High Performance Transaction Systems, Asilomar, Sep. 1999
1999

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publication iconMärtens, H.
Skew-Insensitive Join Processing in Shared-Disk Database Systems
Proc. Issues and Applications of Database Technology (IADT’98), Berlin, 1998
1998
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Rahm, E.
Dynamic Load Balancing in Parallel Database Systems
Proc. EURO-PAR 96 Conf, LNCS 1123, Springer-Verlag, Lyon, Aug. 1996 (Keynote Paper)
1996
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Rahm, E.; Marek, R.
Dynamic Multi-Resource Load Balancing in Parallel Database Systems
Proc. 21th Int. Conf. on Very Large Database Systems, Zurich, Sep. 1995
1995
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Rahm, E.; Stöhr, T.
Analysis of Parallel Scan Processing in Shared Disk Database Systems
Proc. EURO-PAR, Stockholm, Springer-Verlag, LNCS, Aug. 1995
1995
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Rahm, E.
Mehrrechner-Datenbanksysteme

1994
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Rahm, E.; Marek, R.
Analysis of Dynamic Load Balancing Strategies for Parallel Shared Nothing Database Systems
Proc. 19th Int. Conf. on Very Large Database Systems, Dublin, August 1993, pp. 182-193
1993
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Marek, R.; Rahm, E.
On the Performance of Parallel Join Processing in Shared Nothing Database Systems
Proc. 5th Int. PARLE Conf. (Parallel Architectures and Languages Europe), Springer Lecture Notes in Computer Science 694, pp. 622-633
1993
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publication iconRahm, E.
Concurrency and Coherency Control in Database Sharing Systems.
Technical Report, Dec. 1991, revised: March 1993
1993
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Rahm, E.
Empirical Performance Evaluation of Concurrency and Coherency Control Protocols for Database Sharing Systems
ACM Transactions on Database Systems, Vol. 18, No. 2, June 1993, pp. 333-377.
1993
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Rahm, E.
Evaluation of Closely Coupled Systems for High Performance Database Processing
Proc. 13th Int. Conf. on Distributed Computing Systems, Pittsburgh, USA, May 1993, IEEE Computer Society Press, pp. 301-310
1993
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Rahm, E.
Hochleistungs-Transaktionssysteme

1993
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Rahm, E.
Parallel Query Processing in Shared Disk Database Systems
Sigmod Record, 22(4): 32-37, Dec. 1993. Long version from:Proc. 5th Int. Workshop on High Performance Transaction Systems, Asilomar (CA), USA, Sep. 1993;
1993
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Marek, R.; Rahm, E.
Performance Evaluation of Parallel Transaction Processing in Shared Nothing Database Systems
Proc. 4th Int. PARLE Conf. (Parallel Architectures and Languages Europe), Springer LNCS 605, pp. 295-310
1992
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Rahm, E.
A Framework for Workload Allocation in Distributed Transaction Processing Systems,
The Journal of Systems and Software, Vol. 18, No. 3, 1992, pp. 171 - 190
1992
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publication iconBohn, V.; Härder, T.; Rahm, E.
Extended Memory Support for High Performance Transaction Systems
Proc. Messung, Modellierung und Bewertung von Rechensystemen (MMB)
1991
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Rahm, E.
Recovery Concepts for Data Sharing Systems,
Proc. 21st Int. Symp. on Fault-Tolerant Computing Systems (FTCS-21), Montreal, June 1991, IEEE Computer Society Press, S. 368-375
1991
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Rahm, E.
Der Database-Sharing-Ansatz zur Realisierung von Hochleistungs-Transaktionssystemen
Informatik-Spektrum, Vol. 12, No. 2, 1989, pp. 65 – 81
1989

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Rahm, Erhard
Synchronisation in Mehrrechner-Datenbanksystemen. Konzepte, Realisierungsformen und quantitative Bewertung
Springer Informatik-Fachberichte
1988
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Rahm, E.
Design of Optimistic Methods for Concurrency Control in Database Sharing Systems.
Proc. 7th Int. Conf. on Distributed Computing Systems, IEEE Computer Society Press, 154-161, Berlin, Sep. 1987
1987
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Rahm, E.
Integrated Solutions to Concurrency Control and Buffer Invalidation in Database Sharing Systems,
in: Proc. 2nd Int.Conf. on Computers and Applications, IEEE Computer Society Press, pp. 410-417, Peking, June 1987
1987
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Rahm, E.
Primary Copy Synchronization for DB-Sharing.
Information Systems 11 (4), 275-286, 1986
1986
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publication iconRahm, Erhard
Concurrency Control in DB-Sharing Systems
Proc. GI-Jahrestagung
1986
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Härder, T.; Rahm, E.
Quantitative Analyse eines Synchronisationsalgorithmus für DB-Sharing
Proc. MMB 1985
1985