Optimizing And Implementing Repair Programs For Consistent Query Answering In Databases
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Database Repairing And Consistent Query Answering
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Author : Leopoldo Bertossi
language : en
Publisher: Springer Nature
Release Date : 2022-05-31
Database Repairing And Consistent Query Answering written by Leopoldo Bertossi and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-05-31 with Computers categories.
Integrity constraints are semantic conditions that a database should satisfy in order to be an appropriate model of external reality. In practice, and for many reasons, a database may not satisfy those integrity constraints, and for that reason it is said to be inconsistent. However, and most likely, a large portion of the database is still semantically correct, in a sense that has to be made precise. After having provided a formal characterization of consistent data in an inconsistent database, the natural problem emerges of extracting that semantically correct data, as query answers. The consistent data in an inconsistent database is usually characterized as the data that persists across all the database instances that are consistent and minimally differ from the inconsistent instance. Those are the so-called repairs of the database. In particular, the consistent answers to a query posed to the inconsistent database are those answers that can be simultaneously obtained from all the database repairs. As expected, the notion of repair requires an adequate notion of distance that allows for the comparison of databases with respect to how much they differ from the inconsistent instance. On this basis, the minimality condition on repairs can be properly formulated. In this monograph we present and discuss these fundamental concepts, different repair semantics, algorithms for computing consistent answers to queries, and also complexity-theoretic results related to the computation of repairs and doing consistent query answering. Table of Contents: Introduction / The Notions of Repair and Consistent Answer / Tractable CQA and Query Rewriting / Logically Specifying Repairs / Decision Problems in CQA: Complexity and Algorithms / Repairs and Data Cleaning
Scalable Uncertainty Management
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Author : Henri Prade
language : en
Publisher: Springer
Release Date : 2007-09-20
Scalable Uncertainty Management written by Henri Prade and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-09-20 with Business & Economics categories.
This book constitutes the refereed proceedings of the First International Conference on Scalable Uncertainty Management, SUM 2007, held in Washington, DC, USA, in October 2007. The 20 revised full papers presented were carefully reviewed and selected from numerous submissions for inclusion in the book. The papers address artificial intelligence researchers, database researchers and practitioners.
Optimizing Repair Programs For Consistent Query Answering In Databases
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Author : Monica Caniupan
language : en
Publisher: LAP Lambert Academic Publishing
Release Date : 2011-05
Optimizing Repair Programs For Consistent Query Answering In Databases written by Monica Caniupan and has been published by LAP Lambert Academic Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-05 with categories.
Databases may not always satisfy their integrity constraints (ICs). However, in most cases an important part of the data is still consistent with the ICs, and can still be retrieved through queries posed to the database. Consistent query answers are characterized as answers obtained from every minimally repaired and consistent version of the database. Database repairs can be specied as stable models of disjunctive logic programs. Consistent Query Answering (CQA) for first-order queries is translated into cautious reasoning under the stable models semantics. Using logic programs in a straightforward manner is usually inefficient. We develop optimized techniques to evaluate queries over inconsistent databases by using logic programs. We optimize the structure of programs, model computation, and evaluation of queries from them. Moreover, we propose the use of the well-founded semantics (WFS) as an alternative way to obtain consistent answers. The WFS has lower data complexity than the stable models semantics. We also extend the use of logic programs for retrieving consistent answers to aggregate queries, and we develop a repair semantics for Data Warehouses.
Optimizing And Implementing Repair Programs For Consistent Query Answering In Databases
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Author : Mónica Caniupán
language : en
Publisher:
Release Date : 2007
Optimizing And Implementing Repair Programs For Consistent Query Answering In Databases written by Mónica Caniupán and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Computer logic categories.
Semantics In Databases
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Author : Leopoldo Bertossi
language : en
Publisher: Springer Science & Business Media
Release Date : 2003-04-07
Semantics In Databases written by Leopoldo Bertossi and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003-04-07 with Computers categories.
This book constitutes the thoroughly refereed post-proceedings of the Second International Workshop on Semantics in Databases, held in Dagstuhl Castle, Germany, in January 2001. The 10 revised full papers presented together with an introduction by the volume editors were carefully selected during two rounds of reviewing. Among the aspects of database semantics discussed are semantic constraints, paraconsistency, logic foundations of databases, ER modeling, type hierarchies, null values, consistency enforcement, logic-based pattern languages, and semantic classification of queries. Among the classes of databases dealt with are deductive databases, relational databases, distributed information systems, and tree-structured data.
Combinatorial Optimization And Applications
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Author : Xiaofeng Gao
language : en
Publisher: Springer
Release Date : 2017-12-06
Combinatorial Optimization And Applications written by Xiaofeng Gao and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-12-06 with Computers categories.
The two-volume set LNCS 10627 and 10628 constitutes the refereed proceedings of the 11th International Conference on Combinatorial Optimization and Applications, COCOA 2017, held in Shanghai, China, in December 2017. The 59 full papers and 19 short papers presented were carefully reviewed and selected from 145 submissions. The papers cover most aspects of theoretical computer science and combinatorics related to computing, including classic combinatorial optimization, geometric optimization, complexity and data structures, and graph theory. They are organized in topical sections on network, approximation algorithm and graph theory, combinatorial optimization, game theory, and applications.
Foundations Of Information And Knowledge Systems
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Author : Flavio Ferrarotti
language : en
Publisher: Springer
Release Date : 2018-05-07
Foundations Of Information And Knowledge Systems written by Flavio Ferrarotti and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-05-07 with Mathematics categories.
This book constitutes the refereed proceedings of the 10th International Symposium on Foundations of Information and Knowledge Systems, FoIKS 2018, held in Budapest, Hungary, in May 2018.The 20 revised full papers presented together with 1 invited talk were carefully reviewed and selected from 40 submissions. The papers address various topics such as big data; database design; dynamics of information; information fusion; integrity and constraint management; intelligent agents; knowledge discovery and information retrieval; knowledge representation, reasoning and planning; logics in databases and AI; mathematical foundations; security in information and knowledge systems; semi-structured data and XML; social computing; the semantic web and knowledge management; and the world wide web.
Flexible Query Answering Systems
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Author : Henrik L. Larsen
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-08-27
Flexible Query Answering Systems written by Henrik L. Larsen and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-08-27 with Computers categories.
This volume constitutes the proceedings of the Fourth International Conference on Flexible Query Answering Systems, FQAS'2000, held in Warsaw, Poland on October 25 - 28, 2000. The FQAS conference has been the premier conference focusing on one of key issues that the information society faces, namely that of providing easy, flexible, intuitive access to information for everybody. In targeting this issue, the conference draws on several research areas, such as databases, querying, information retrieval, knowledge representation, soft computing, cyberspace, multimedia systems, human-computer interaction, etc. FQAS'2000 has been preceded by the extremely successful FQAS'94, FQAS'96 and FQAS'98 conferences all held in Roskilde, Denmark. The present conference provides a unique opportunity for researchers, developers and practitioners to explore new ideas and approaches in a multidisciplinary forum. As a metaphor for flexible query answering we may consider a human intermediary who has expertise in the topic of the query, and is experienced in identifying the user's information needs and answering the needs from the available information resources. The use of knowledge on relevant contexts, available information resources, etc. , enables the expert to respond rather precisely to the needs, though the query, per se, may be imprecise, incomplete, etc. Thus, a key issue for flexible query answering system is to obtain, maintain, represent, and utilize such knowledge. This comprises domain knowledge and metaknowledge, its representation and organization in ontologies, terminologies, etc.
Logic Programming
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Author : Catuscia Palamidessi
language : en
Publisher: Springer Science & Business Media
Release Date : 2003-11-25
Logic Programming written by Catuscia Palamidessi and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003-11-25 with Computers categories.
This book constitutes the refereed proceedings of the 19th International Conference on Logic Programming, ICLP 2003, held in Mumbai, India in December 2003. The 23 revised full papers and 19 poster papers presented together with 5 invited full contributions and abstracts of 4 invited contributions were carefully reviewed and selected from 81 submissions. All current issues in logic programming are addressed.
Advances In Databases Concepts Systems And Applications
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Author : Ramamohanarao Kotagiri
language : en
Publisher: Springer
Release Date : 2007-08-02
Advances In Databases Concepts Systems And Applications written by Ramamohanarao Kotagiri and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-08-02 with Computers categories.
This book constitutes the refereed proceedings of the 12th International Conference on Database Systems for Advanced Applications, DASFAA 2007, held in Bangkok, Thailand, April 2007. Coverage includes query language and query optimization, data mining and knowledge discovery, P2P and grid-based data management, XML databases, database modeling and information retrieval, Web and information retrieval, database applications and security.