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Auflistung nach Autor:in "Enderle, Jost"

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  • Konferenzbeitrag
    Integrating the relational interval tree into IBM's DB2 universal database server
    (Datenbanksysteme in Business, Technologie und Web, 11. Fachtagung des GIFachbereichs “Datenbanken und Informationssysteme” (DBIS), 2005) Brochhaus, Christoph; Enderle, Jost; Schlosser, Achim; Seidl, Thomas; Stolze, Knut
    User-defined data types such as intervals require specialized access methods to be efficiently searched and queried. As database implementors cannot provide appropriate index structures and query processing methods for each conceivable data type, present-day object-relational database systems offer extensible indexing frameworks that enable developers to extend the set of built-in index structures by custom access methods. Although these frameworks permit a seamless integration of user-defined indexing techniques into query processing they do not facilitate the actual implementation of the access method itself. In order to leverage the applicability of indexing frameworks, relational access methods such as the Relational Interval Tree (RI-tree), an efficient index structure to process interval intersection queries, mainly rely on the functionality, robustness and performance of built-in indexes, thus simplifying the index implementation significantly. To investigate the behavior and performance of the recently released IBM DB2 indexing framework we use this interface to integrate the RI-tree into the DB2 server. The standard implementation of the RI-tree, however, does not fit to the narrow corset of the DB2 framework which is restricted to the use of a single index only. We therefore present our adaptation of the originally two-tree technique to the single index constraint. As experimental results with interval intersection queries show, the plugged-in access method delivers excellent performance compared to other techniques.
  • Zeitschriftenartikel
    XML in relationalen Datenbanken
    (Informatik-Spektrum: Vol. 24, No. 6, 2001) Enderle, Jost
    Die zunehmende Bedeutung von XML zwingt auch die Hersteller relationaler Datenbanksysteme zur Bereitstellung entsprechender Schnittstellen. Einerseits sollte es möglich sein, relationale Daten im XML-Format auszugeben; andererseits ist es auch von Vorteil, wenn XML-Daten direkt im Datenbanksystem gespeichert werden können. Der vorliegende Artikel beschreibt verschiedene Ansätze und gibt Einblicke in aktuelle Implementierungen.