DATA INTEGRATION SCHEMA ANALYSIS: AN APPROACH WITH INFORMATION QUALITY

摘要

Integrated access to distributed data is an important problem faced in many scientific and commercialrnapplications. A data integration system provides a unified view for users to submit queries over multiplernautonomous data sources. The queries are processed over a global schema that offers an integrated view of the datarnsources. Much work has been done on query processing and choosing plans under cost criteria. However, not sornmuch is known about incorporating Information Quality analysis into data integration systems, particularly in thernintegrated schema. In this work we present an approach of Information Quality analysis of schemas in datarnintegration environments. We discuss the evaluation of schema quality focusing in minimality and consistencyrnaspects and define some schema transformations to be applied in order to improve schema generation and,rnconsequently, the quality of data integration query execution.