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Auflistung nach Schlagwort "Query processing"

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  • Zeitschriftenartikel
    A Database Perspective on Consuming Linked Data on the Web
    (Datenbank-Spektrum: Vol. 10, No. 2, 2010) Hartig, Olaf; Langegger, Andreas
    During recent years an increasing number of data providers adopted the Linked Data principles for publishing and connecting structured data on the Web, thus creating a globally distributed dataspace—the Web of Data. While the execution of structured, SQL-like queries over this dataspace opens possibilities not conceivable before, query execution on the Web of Data poses novel challenges. These challenges provide great opportunities for the database community.In this article we introduce the concept of Linked Data and discuss different approaches to query the Web of Data. Our goal is to provide a general understanding of this new research area and of the challenges and open issues that must be addressed.
  • Zeitschriftenartikel
    JEPC: The Java Event Processing Connectivity
    (Datenbank-Spektrum: Vol. 13, No. 3, 2013) Hoßbach, Bastian; Glombiewski, Nikolaus; Morgen, Andreas; Ritter, Franz; Seeger, Bernhard
    Today, event processing (EP) is the first choice technology for analyzing massive event streams in a timely manner. EP allows to detect user-defined situations of interest, like in streaming position events for example, in near real-time such that actions can be taken immediately. Unfortunately, each specific EP system has its very own API and query language because there are no standards. The exchange of EP systems as well as their use within a federation is challenging, error-prone, and expensive. To overcome these problems, we introduce the Java Event Processing Connectivity (JEPC) that is a middleware for uniform EP functionality in Java. JEPC provides always the same API and query language for EP completely independent of the EP system beneath. Furthermore, we show in detail how JEPC can integrate database systems besides EP systems and evaluate the performance of EP powered by databases systems.