Browsing by Author "Wagner, Ralf"

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • Thumbnail Image
    ItemOpen Access
    Improving the processing of decision support queries : strategies for a DSS optimizer
    (2001) Schwarz, Holger; Wagner, Ralf; Mitschang, Bernhard
    Many decision support applications are built upon data mining and OLAP tools and allow users to answer information requests based on a data warehouse that is managed by a powerful DBMS. In this paper, we focus on tools that generate sequences of SQL statements in order to produce the requested information. Our thorough analysis revealed that many sequences of queries that are generated by commercial tools are not very efficient. An optimized system architecture is suggested for these applications. The main component is a DSS optimizer that accepts pre-viously generated sequences of queries and remodels them according to a set of optimization strategies, before they are executed by the underlying database system. The advantages of this extended architecture are discussed and a couple of appropriate optimization strategies are identified. Experimental results are given, showing that these strategies are appropriate to optimize query sequences of OLAP applications.
  • Thumbnail Image
    ItemOpen Access
    Integration management : a virtualization architecture for adapter technologies
    (2015) Wagner, Ralf; Mitschang, Bernhard (Prof. Dr.-Ing. habil.)
    Integration management (IM) provides a means of systematically dealing with integration technologies. It abstracts from integration technologies so that software development is shielded from integration tasks. The achieved integration independence significantly alleviates maintenance and evolution of IT environments and reduces the overall complexity and costs of IT landscapes.