TY - GEN
T1 - Management of inconsistent information in federated systems
AU - Getta, Janusz R.
AU - Maciaszek, Leszek A.
PY - 1995
Y1 - 1995
N2 - Lack of global consistency control mechanisms, replication of data and uncontrolled transfer of information among the database servers of a federated database system are the main reasons for information inconsistencies in such systems. Database models are largely incapable of handling inconsistent information and the responsibility for managing inconsistencies is transferred to the application or “middleware” software. The paper introduces an object database model that provides for the flexible representation of a variety of inconsistent information. The model can be considered as a middleware solution to the problem. The model includes the definition of a declarative query language and the evaluation of its formulas in a database with inconsistently specified objects. Furthermore, the problems related to the elimination of redundancies and the nonloss decomposition of the inconsistent information are discussed. The decomposition reduces the complexity of inconsistently specified objects. The decomposed objects can be reconstructed and, therefore, the inconsistent information coming from a number of different sources can be consistently merged. Basic operators for the manipulation of inconsistently specified properties of objects are defined.
AB - Lack of global consistency control mechanisms, replication of data and uncontrolled transfer of information among the database servers of a federated database system are the main reasons for information inconsistencies in such systems. Database models are largely incapable of handling inconsistent information and the responsibility for managing inconsistencies is transferred to the application or “middleware” software. The paper introduces an object database model that provides for the flexible representation of a variety of inconsistent information. The model can be considered as a middleware solution to the problem. The model includes the definition of a declarative query language and the evaluation of its formulas in a database with inconsistently specified objects. Furthermore, the problems related to the elimination of redundancies and the nonloss decomposition of the inconsistent information are discussed. The decomposition reduces the complexity of inconsistently specified objects. The decomposed objects can be reconstructed and, therefore, the inconsistent information coming from a number of different sources can be consistently merged. Basic operators for the manipulation of inconsistently specified properties of objects are defined.
UR - http://www.scopus.com/inward/record.url?scp=84947755665&partnerID=8YFLogxK
M3 - Conference proceeding contribution
AN - SCOPUS:84947755665
SN - 3540606726
SN - 9783540606727
VL - 1021
T3 - Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
SP - 412
EP - 423
BT - OOER 1995: Object-Oriented and Entity-Relationship Modeling - 14th International Conference, Proceedings
PB - Springer, Springer Nature
CY - Berlin ; New York
T2 - 14th International Conference on Object-Oriented Entity-Relationship, OOER 1995
Y2 - 13 December 1995 through 15 December 1995
ER -