Browsing by Subject "Timing constraints"

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    Data replication versus timing constraints in distributed database systems
    (ACM, 1994-03) Ulusoy, Özgür
    In a database system supporting a real-time application, each transaction is associated with a timing constraint, typically in the form of a deadline. Replicated database systems possess desirable features for real-time applications, such as a high level of data availability, and potentially improved response time for queries. On the other hand, multiple copy updates lead to a considerable overhead due to the communication required among the data sites holding the copies. In this paper, we investigate the impact of storing multiple copies of data on satisfying the timing constraints of real-time transactions. A detailed performance model of a distributed database system is employed in evaluating the effects of various workload parameters and design alternatives on the system performance. The performance is expressed in terms of the fraction of satisfied transaction deadlines.
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    An evaluation of a client-server real-time database system
    (ACM, 1996) Ulusoy, Özgür
    A real-time database system (RTDBS) can be defined as a database system where transactions are associated with real-time constraints. In this paper, we investigate various performance issues in a RTDBS constructed on a client-server system architecture. In a client-server database management system the whole database is stored on the server disks, and copies of database items can be cached in the client memories. We provide a detailed simulation model of a client-server RTDBS, and present the initial results of a performance work that evaluates the effects of various workload parameters and design alternatives. Index Terms - Real-time database systems, client-server architecture, transaction scheduling, timing constraints.