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Doctoral Thesis - Abstract
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The demand-oriented access to consolidated reporting systems represents a critical success factor for operating organisations in order to achieve an informational advantage over their competitors. Data warehouse systems (DWH systems) provide decision-makers with information relevant to their current task in due time and form. In practice, however, a multitude of highly heterogeneous DWH systems exist which particularly vary in terms of applied data schemata and underlying terminologies. Inconsistencies between the generated reports of those systems as well as a diverging interpretation of the report results are therefore immediate consequences. As a result, the construction of a consolidated reporting system inevitably demands additional manual alignment effort.
The thesis at hand is especially dedicated to information provided by multiple DWH systems. By means of the technologies of the Resource Description Framework (RDF) and the Web Ontology Language (OWL), which are established in the area of the semantic web, a framework is created to describe DWH metadata in a semantically comprehensive way. The metadata of different DWH systems marked in such a way are finally brought together in a semantic level of homogenisation (sHGS). With this tool, semantic relations between multiple DWH systems can be easily identified and their semantic heterogeneity can be overcome.
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