|Schwarz, Holger; Wagner, Ralf; Mitschang, Bernhard: Improving the Processing of Decision Support Queries: The Case for a DSS Optimizer. |
In: Adiba, Michel (Hrsg); Collet, Christine (Hrsg); Desai, Bipin C. (Hrsg): Proc. of the 2001 International Database Engineering & Applications Symposium (IDEAS), July 16-18, 2001.
Universität Stuttgart, Fakultät Informatik.
S. 177-186, englisch.
Los Alamitos, Washington, Brussels, Tokyo: IEEE Computer Society, Juli 2001.
Artikel in Tagungsband (Konferenz-Beitrag).
|CR-Klassif.||H.4.2 (Information Systems Applications Types of Systems)|
|Keywords||Decision Support; OLAP; Data Warehouse|
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 previously 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 typical query sequences of an OLAP application.
|PDF (126057 Bytes)|
|Abteilung(en)||Universität Stuttgart, Institut für Parallele und Verteilte Höchstleistungsrechner, Anwendersoftware|
|Eingabedatum||8. August 2001|