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What is Inconsistency Tolerance

Encyclopedia of Information Science and Technology, Second Edition
A practically indispensable property. Integrity checking is inconsistency-tolerant if the invariance of all satisfied cases of integrity constraints across updates can be ensured, even if some other cases are violated.
Published in Chapter:
Database Integrity Checking
Hendrik Decker (Universidad Politécnica de Valencia, Spain) and Davide Martinenghi (Free University of Bozen/Bolzano, Italy)
DOI: 10.4018/978-1-60566-026-4.ch153
Integrity constraints (or simply “constraints”) are formal representations of invariant conditions for the semantic correctness of database records. Constraints can be expressed in declarative languages such as datalog, predicate logic, or SQL. This article highlights the historical background of integrity constraints and the essential features of their simplified incremental evaluation. It concludes with an outlook on future trends.
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Inconsistency-Tolerant Integrity Checking
Property of simplification methods that makes them usable also in the presence of inconsistency. Whenever an inconsistency-tolerant method returns that integrity is satisfied, the preservation of all consistent cases of the integrity theory in the updated state is guaranteed even if there were inconsistent cases before the update.
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