Add to ORKGWhen data sources are virtually integrated there is no common and centralized mechanism for maintaining global consistency. In consequence, it is likely that inconsistencies with respect to certain global integrity constraints (ICs) will occur. In this chapter we consider the problem of defining and computing those answers that are consistent wrt the global ICs when global queries are posed to virtual data integration systems whose sources are specified following the local-as-view approach. The solution is based on a specification using logic programs with stable model semantics of the minimal legal instances of the integration system. Apart from being useful for computing consistent answers, the specification can be used to compute the cer...
. Given some integrity constraints over a distributed database, we consider the problem of increment...
Abstract. Data integration is the problem of combining data residing at different sources, and provi...
Databases may not always satisfy their integrity constraints (ICs) and a number of different reasons...
Abstract. When data sources are virtually integrated there is no common and centralized mechanism fo...
When data sources are integrated into a single global system, inconsistencies wrt global integrity c...
AbstractWe address the problem of retrieving certain and consistent answers to queries posed to a me...
Data integration systems provide access to a set of heterogeneous, autonomous data sources through a...
Data integration systems provide access to a set of heterogeneous, autonomous data sources through ...
Data integration consists in providing a uniform access to a set of data sources, through a unified ...
Abstract. In this paper we thoroughly analyze a problem of query answering under Exact View Assumpti...
When data sources are virtually integrated, there is no common and centralized method to maintain gl...
www.scs.carleton.ca / ∼ bertossi Abstract: This course addresses the logical aspects of the problem...
Consistent answers from a relational database that violates a given set of integrity constraints (IC...
We show how to specify and use the metadata for a virtual and relational data integration system und...
We present an optimization for integrity constraint verification in distributed databases. The optim...
. Given some integrity constraints over a distributed database, we consider the problem of increment...
Abstract. Data integration is the problem of combining data residing at different sources, and provi...
Databases may not always satisfy their integrity constraints (ICs) and a number of different reasons...
Abstract. When data sources are virtually integrated there is no common and centralized mechanism fo...
When data sources are integrated into a single global system, inconsistencies wrt global integrity c...
AbstractWe address the problem of retrieving certain and consistent answers to queries posed to a me...
Data integration systems provide access to a set of heterogeneous, autonomous data sources through a...
Data integration systems provide access to a set of heterogeneous, autonomous data sources through ...
Data integration consists in providing a uniform access to a set of data sources, through a unified ...
Abstract. In this paper we thoroughly analyze a problem of query answering under Exact View Assumpti...
When data sources are virtually integrated, there is no common and centralized method to maintain gl...
www.scs.carleton.ca / ∼ bertossi Abstract: This course addresses the logical aspects of the problem...
Consistent answers from a relational database that violates a given set of integrity constraints (IC...
We show how to specify and use the metadata for a virtual and relational data integration system und...
We present an optimization for integrity constraint verification in distributed databases. The optim...
. Given some integrity constraints over a distributed database, we consider the problem of increment...
Abstract. Data integration is the problem of combining data residing at different sources, and provi...
Databases may not always satisfy their integrity constraints (ICs) and a number of different reasons...