Core schema mappings

Giansalvatore Mecca, Paolo Papotti, Salvatore Raunich
2009 Proceedings of the 35th SIGMOD international conference on Management of data - SIGMOD '09  
Research has investigated mappings among data sources under two perspectives. On one side, there are studies of practical tools for schema mapping generation; these focus on algorithms to generate mappings based on visual specifications provided by users. On the other side, we have theoretical researches about data exchange. These study how to generate a solution -i.e., a target instance -given a set of mappings usually specified as tuple generating dependencies. However, despite the fact that
more » ... he notion of a core of a data exchange solution has been formally identified as an optimal solution, there are yet no mapping systems that support core computations. In this paper we introduce several new algorithms that contribute to bridge the gap between the practice of mapping generation and the theory of data exchange. We show how, given a mapping scenario, it is possible to generate an executable script that computes core solutions for the corresponding data exchange problem. The algorithms have been implemented and tested using common runtime engines to show that they guarantee very good performances, orders of magnitudes better than those of known algorithms that compute the core as a post-processing step.
doi:10.1145/1559845.1559914 dblp:conf/sigmod/MeccaPR09 fatcat:27b4xlfowjbivi5hcym35oejrq