Managing Inconsistent Databases Using Active Integrity Constraints

Managing Inconsistent Databases Using Active Integrity Constraints

Sergio Flesca (DEIS Università della Calabria, Italy), Sergio Greco (DEIS Università della Calabria, Italy) and Ester Zumpano (DEIS Università della Calabria, Italy)
Copyright: © 2005 |Pages: 6
DOI: 10.4018/978-1-59140-560-3.ch059
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Abstract

Integrity constraints are a fundamental part of a database schema. They are generally used to define constraints on data (functional dependencies, inclusion dependencies, exclusion dependencies, etc.), and their enforcement ensures a semantically correct state of a database. As the presence of data inconsistent with respect to integrity constraints is not unusual, its management plays a key role in all the areas in which duplicate or conflicting information is likely to occur, such as database integration, data warehousing, and federated databases (Bry, 1997; Lin, 1996; Subrahmanian, 1994). It is well known that the presence of inconsistent data can be managed by “repairing” the database, that is, by providing consistent databases, obtained by a minimal set of update operations on the inconsistent original environment, or by consistently answering queries posed over the inconsistent database.

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