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The extremely expensive process of integrating data to achieve a consolidated database is one of the main problems in building a data warehouse. Since operational data sources may exhibit a high update rate, the data warehouse information is out of date by the order of magnitude. To avoid out-dated information the alternative is to query the data sources directly, which results in higher query runtimes or in the complete failure producing a result if data sources are currently not available.dblp:conf/dmdw/SchlesingerL02 fatcat:6627gku4dbh2hn7jk3p6p7n5lm