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Prof.dr. P.M.G. Apers Person

Prof.dr. P.M.G. Apers

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  • Dataflow query execution in a parallel main-memory environment (1991)Open access

    Authors:Wilschut, Annita N.; Apers, Peter M.G.

    Abstract:

    The performance and characteristics of the execution of various join-trees on a parallel DBMS are studied. The results are a step in the direction of the design of a query optimization strategy that is fit for parallel execution of complex queries. Among others, synchronization issues are identified

  • Parallel handling of integrity constraints (1991)Open access

    Authors:Grefen, Paul W.P.J.; Flokstra, Jan; Apers, Peter M.G.

    Abstract:

    Integrity constraints form an important part of a data model. Therefore, a complete integrity constraint handling subsystem is considered an important part of any modern DBMS. In implementing an integrity constraint handling subsystem, there are two major problem areas: providing enough functionalit

  • Parallel Query Execution in PRISMA/DB (1990)Open access

    Authors:Wilschut, A.N.; Apers, P.M.G.; Flokstra, J.

  • The PRISMA experiment (1990)Open access

    Authors:Apers, Peter M.G.; Hertzberger, L.O.; Hulshof, Ben J.A.

    Abstract:

    The design of a large database management system on top of an object-oriented platform which is implemented on a tightly coupled multiprocessor system requires a large number of design decisions. There exist no methodology to evaluate the consequences and compare the differences between them. Lookin

  • Pipelining in Query Executions (1990)Open access

    Authors:Wilschut, Annita N.; Apers, Peter M.G.

    Abstract:

    It is shown that the use of an adjusted algorithm can improve the performance of a nested query execution containing join operations. Apart from the equijoin, the union, Cartesian product, ¿-join, and intersection operations can be implemented in a pipelining way. The difference, however, cannot be

  • Parallel handling of Integrity constraints on fragmented relations (1990)Open access

    Authors:Grefen, Paul W.P.J.; Apers, Peter M.G.

    Abstract:

    A short introduction to the important aspects of the PRISMA DBMS (database management system) and to the notation and terminology used is presented. It is shown how integrity constraints formulated in terms of global relations can be translated into a fragmented form. The strategy for constraint enf

  • Implementing PRISMA/DB in an OOPL (1989)Open access

    Authors:Wilschut, A.N.; Grefen, P.W.P.J.; Apers, P.M.G.; Kersten, M.L.

    Abstract:

    PRISMA/DB is implemented in a parallel object-oriented language to gain insight in the usage of parallelism. This environment allows us to experiment with parallelism by simply changing the allocation of objects to the processors of the PRISMA machine. These objects are obtained by a strictly modula

  • Optimization Algorithms for Distributed Queries (1983)Open access

    Authors:Apers, Peter M.G.; Hevner, Alan R.; Yao, S. Bing
    In:IEEE Transactions on Software Engineering, 9, 57 - 68. Los Alamitos, CA, USA: IEEE. ISSN 0098-5589.

    Abstract:

    The efficiency of processing strategies for queries in a distributed database is critical for system performance. Methods are studied to minimize the response time and the total time for distributed queries. A new algorithm (Algorithm GENERAL) is presented to derive processing strategies for arbitra

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