Browsing by Author "Buchmann, A."

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    Exploiting Main Memory DBMS Features to Improve Real-Time Concurrency Control Protocols
    (1996) Ulusoy Ö.; Buchmann, A.
    [No abstract available]
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    OBJECTIVE: A benchmark for object-oriented active database systems
    (Elsevier, 1999) Çetintemel, U.; Zimmermann, J.; Ulusoy, Özgür; Buchmann, A.
    Although much work in the area of Active Database Management Systems (ADBMSs) has been done, it is not yet clear how the performance of an active DBMS can be evaluated systematically. In this paper, we describe the OBJECTIVE Benchmark for object-oriented ADBMSs, and present experimental results from its implementation in an active database system prototype. OBJECTIVE can be used to identify performance bottlenecks and active functionalities of an ADBMS, and to compare the performance of multiple ADBMSs.
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    A real-time concurrency control protocol for main-memory database systems
    (Elsevier, 1998) Ulusoy, Özgür; Buchmann, A.
    Protocols developed so far for concurrency control in real-time database systems have assumed a dynamic acquisition of data resources as it is impossible to predict which instances of relations will actually be accessed by each transaction. In this paper double dagger, we present a new concurrency control protocol for main-memory real-time database systems, which is based on predeclaration of data requirements at a relation granularity. When a transaction is submitted, it is possible to detect with simple syntactical means which relations will be accessed by the transaction. Preacquisition of data resources enables the system to execute transactions in a conflict-free manner. The protocol also offers the possibility of determining execution times without the effects of blocking and I/O, thereby allowing us to give guarantees for the execution of high-priority transactions. Through a series of simulation experiments, the protocol is compared against some typical concurrency control protocols proposed recently for real-time database systems. (C) 1998 Elsevier Science Ltd. All rights reserved.