Integration of data source using query processing for distribute heterogeneous environment

Now day´s data integration is the new era of research of combining data residing at different sources and providing the user with a unified view. The problem with designing of data integration system is challenging task in real world applications. Characterization of integrated is interesting from a conceptual point of view. This research presents an overview of data integration of the given material. In this research, we are highlighting some of the theoretical issues that are relevant and important for data integration. We are emphasizing on some aspects of modeling that includes data integration applications, processing queries in data integration, dealing with inconsistent data source and reasoning on queries. Our proposed methodology defines coverage of schemas and query processing for distribute data sources followed by the query optimization, query languages implementation for querying structured, semi structured and unstructured data. and reducing data inconsistencies during data integrations.