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Featured researches published by Rainer Heller.


Theory and Practice of Object Systems | 1999

Evaluating the performance of object—oriented database systems by means of a concrete application

Uwe Hohenstein; Volkmar Plesser; Rainer Heller

Because of the increasing use of object-oriented database systems, special benchmarks have been developed to analyze performance. The benchmarks show unanimously that object-oriented systems are well-suited for applications that manage complex structures. Particularly, object-oriented database systems provide higher performance than relational ones. This is proven by synthetic schemas and elementary operations such as inserts and traversals, which are supposed to be characteristic for a lot of object-oriented applications. This experience report presents the results of a real application-specific investigation, comparing three commercial object-oriented database systems. The tests we performed took the elapsed times of an application “as a whole.” In spite of having characteristics similar to standard benchmarks, we obtained huge performance differences. To put it in a nutshell, standard benchmarks are not always meaningful and should not cause one to jump to conclusions.


Archive | 1997

Eine Evaluierung der Performanz objektorientierter Datenbanksysteme für eine konkrete Applikation

Uwe Hohenstein; Volkmar Pleßer; Rainer Heller

Aufgrund der zunehmenden Relevanz von objektorientierten Datenbanksystemen sind in der Vergangenheit spezielle Benchmarks zur Beurteilung ihres Leistungsvermogens entwickelt worden. Die Benchmarks zeigen einhellig, das objektorientierte Systeme fur viele Applikationen mit komplex vernetzten Strukturen hervorragend geeignet sind und eine hohere Performanz als relationale Systeme aufweisen. Grundlage dieser Beweisfuhrung sind synthetische Schemata und elementare Operationen wie Einfugungen und Traversierungen, die — nach eigenen Aussagen -„charakteristisch“ fur eine Vielzahl von objektorientierten Anwendungen sind.


Archive | 2003

Directory service in an automation system

Rainer Heller; Thomas Jachmann


Archive | 2003

Help system, automation device with a help system and a method for providing help data

Jürgen Büssert; Jan Fischer; Rainer Heller; Harald Herberth; Ronald Lange; Stefan List; Franz-Josef Menzl; Klaus Meusser; Michael Schlemper; Michael Schlereth; Bodo Stölzle; Peter Wiedenberg


Archive | 2003

Upward and downward compatible schema evolution

Marcus Bürgel; Edgar Frank; Rainer Heller; Heinrich Kutzer; Dieter Wissmann


Archive | 2004

Web-based presentation of automation processes

Rainer Heller; Thomas Jachmann; Jörg Middel


Archive | 2003

System for preparing a standard framework for automation appliances

Rainer Heller; Thomas Jachmann; Norbert Portner


Archive | 2003

System and method for updating information

Rainer Heller; Thomas Jachmann; Eduard Zalar


Archive | 2009

Visualization Method for Electrical Machine Operation Models Based on Mechanical Machine Operation Models

Oswin Noetzelmann; Rainer Heller; Dirk Schaumburg


database and expert systems applications | 1997

Evaluating the performance of object-oriented database systems by means of a concrete application

Uwe Hohenstein; Volkmar Plesser; Rainer Heller

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