Data integration under integrity constraints
نویسندگان
چکیده
منابع مشابه
Data Integration under Integrity Constraints
Data integration systems provide access to a set of heterogeneous, autonomous data sources through a so-called global schema. There are basically two approaches for designing a data integration system. In the global-centric approach, one defines the elements of the global schema as views over the sources, whereas in the local-centric approach, one characterizes the sources as views over the glo...
متن کاملSimplification of Integrity Constraints for Data Integration
When two or more databases are combined into a global one, integrity may be violated even when each database is consistent with its own local integrity constraints. Efficient methods for checking global integrity in data integration systems are called for: answers to queries can then be trusted, because either the global database is known to be consistent or suitable actions have been taken to ...
متن کاملSchema Integration with Integrity Constraints
In this paper we discuss the use and treatment of integrity constraints in the federated database design process. We consider different situations occurring frequently in the schema transformation and schema integration process. Based on that, general rules are given which describe the correct treatment of integrity constraints. Other proposed integration approaches do not consider integrity co...
متن کاملOn the Role of Integrity Constraints in Data Integration
We discuss the issue of dealing with integrity constraints over the global schema in data integration. On the one hand, integrity constraints can be used to extract more information from incomplete sources, similarly to the case of databases with incomplete information. On the other hand, integrity constraints raise the problem of dealing with the inconsistency of the whole system, due to contr...
متن کاملRewrite and Conquer: Dealing with Integrity Constraints in Data Integration
The work “Data Integration under Integrity Constraints”, published at the CAiSE 2002 Conference, proposes a rewriting technique for answering queries in data integration systems, in the case where the global schema contains the classical key and foreign key constraints, and the mapping between the data sources and the global schema is of the global-as-view type. In this addendum, we explain why...
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ژورنال
عنوان ژورنال: Information Systems
سال: 2004
ISSN: 0306-4379
DOI: 10.1016/s0306-4379(03)00050-4