Database Repairs And Consistent Query Answering

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Database Repairing and Consistent Query Answering

Author : Leopoldo Bertossi
Publisher : Morgan & Claypool Publishers
ISBN 13 : 1608457621
Total Pages : 124 pages
Book Rating : 4.6/5 (84 download)

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Book Synopsis Database Repairing and Consistent Query Answering by : Leopoldo Bertossi

Download or read book Database Repairing and Consistent Query Answering written by Leopoldo Bertossi and published by Morgan & Claypool Publishers. This book was released on 2011 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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

Database Repairs and Consistent Query Answering

Author : Leopoldo Bertossi
Publisher : Springer Nature
ISBN 13 : 3031018834
Total Pages : 105 pages
Book Rating : 4.0/5 (31 download)

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Book Synopsis Database Repairs and Consistent Query Answering by : Leopoldo Bertossi

Download or read book Database Repairs and Consistent Query Answering written by Leopoldo Bertossi and published by Springer Nature. This book was released on 2022-05-31 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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

Repairing and Querying Databases under Aggregate Constraints

Author : Sergio Flesca
Publisher : Springer Science & Business Media
ISBN 13 : 1461416418
Total Pages : 66 pages
Book Rating : 4.4/5 (614 download)

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Book Synopsis Repairing and Querying Databases under Aggregate Constraints by : Sergio Flesca

Download or read book Repairing and Querying Databases under Aggregate Constraints written by Sergio Flesca and published by Springer Science & Business Media. This book was released on 2011-10-20 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research has deeply investigated several issues related to the use of integrity constraints on relational databases. In particular, a great deal of attention has been devoted to the problem of extracting "reliable" information from databases containing pieces of information inconsistent with regard to some integrity constraints. In this manuscript, the problem of extracting consistent information from relational databases violating integrity constraints on numerical data is addressed. Aggregate constraints defined as linear inequalities on aggregate-sum queries on input data are considered. The notion of repair as consistent set of updates at attribute-value level is exploited, and the characterization of several data-complexity issues related to repairing data and computing consistent query answers is provided. Moreover, a method for computing “reasonable” repairs of inconsistent numerical databases is introduced, for a restricted but expressive class of aggregate constraints. An extension of this method for dealing with the data repairing problem in the presence of weak aggregate constraints which are expected to be satisfied, but not required to, is presented. Furthermore, a technique for computing consistent answers of aggregate queries in the presence of a wide form of aggregate constraints is provided. Finally, extensions of the framework as well as several open problems are discussed.

Flexible Query Answering Systems

Author : Henrik L. Larsen
Publisher : Springer Science & Business Media
ISBN 13 : 9783790813470
Total Pages : 74 pages
Book Rating : 4.8/5 (134 download)

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Book Synopsis Flexible Query Answering Systems by : Henrik L. Larsen

Download or read book Flexible Query Answering Systems written by Henrik L. Larsen and published by Springer Science & Business Media. This book was released on 2000-10-26 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings of the Fourth International Conference on Flexible Query Answering Systems covers the whole array of fields related to users posing flexible queries and (electronic) systems producing answers. The FQAS 2000 Conference has been the premier conference focusing on one of the key issues the information society is facing, namely that of providing easy, flexible, intuitive access to information to 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. This volume provides a unique opportunity for researchers, developers and practitioners to explore new ideas and approaches in a multidisciplinary forum.

Trends in Cleaning Relational Data

Author : Ihab F Ilyas
Publisher :
ISBN 13 : 9781680830231
Total Pages : pages
Book Rating : 4.8/5 (32 download)

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Book Synopsis Trends in Cleaning Relational Data by : Ihab F Ilyas

Download or read book Trends in Cleaning Relational Data written by Ihab F Ilyas and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Flexible Query Answering Systems

Author : Henrik Legind Larsen
Publisher : Springer Science & Business Media
ISBN 13 : 3540346384
Total Pages : 730 pages
Book Rating : 4.5/5 (43 download)

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Book Synopsis Flexible Query Answering Systems by : Henrik Legind Larsen

Download or read book Flexible Query Answering Systems written by Henrik Legind Larsen and published by Springer Science & Business Media. This book was released on 2006-05-30 with total page 730 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceeding of the 7th International Conference on Flexible Query Answering Systems, FQAS 2006, held in Milan, Italy in June 2006. The 60 revised full papers presented were carefully reviewed and selected from numerous submissions. The papers are organized in topical sections on flexibility in database management and quering, vagueness and uncertainty in XML quering and retrieval, information retrieval and filtering, multimedia information access, user modeling and personalization, knowledge and data extraction, intelligent information extraction from text, and knowledge representation and reasoning.

Readings in Database Systems

Author : Joseph M. Hellerstein
Publisher : MIT Press
ISBN 13 : 9780262693141
Total Pages : 884 pages
Book Rating : 4.6/5 (931 download)

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Book Synopsis Readings in Database Systems by : Joseph M. Hellerstein

Download or read book Readings in Database Systems written by Joseph M. Hellerstein and published by MIT Press. This book was released on 2005 with total page 884 pages. Available in PDF, EPUB and Kindle. Book excerpt: The latest edition of a popular text and reference on database research, with substantial new material and revision; covers classical literature and recent hot topics. Lessons from database research have been applied in academic fields ranging from bioinformatics to next-generation Internet architecture and in industrial uses including Web-based e-commerce and search engines. The core ideas in the field have become increasingly influential. This text provides both students and professionals with a grounding in database research and a technical context for understanding recent innovations in the field. The readings included treat the most important issues in the database area--the basic material for any DBMS professional. This fourth edition has been substantially updated and revised, with 21 of the 48 papers new to the edition, four of them published for the first time. Many of the sections have been newly organized, and each section includes a new or substantially revised introduction that discusses the context, motivation, and controversies in a particular area, placing it in the broader perspective of database research. Two introductory articles, never before published, provide an organized, current introduction to basic knowledge of the field; one discusses the history of data models and query languages and the other offers an architectural overview of a database system. The remaining articles range from the classical literature on database research to treatments of current hot topics, including a paper on search engine architecture and a paper on application servers, both written expressly for this edition. The result is a collection of papers that are seminal and also accessible to a reader who has a basic familiarity with database systems.

Flexible Query Answering Systems

Author : Troels Andreasen
Publisher : Springer Nature
ISBN 13 : 3030869679
Total Pages : 245 pages
Book Rating : 4.0/5 (38 download)

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Book Synopsis Flexible Query Answering Systems by : Troels Andreasen

Download or read book Flexible Query Answering Systems written by Troels Andreasen and published by Springer Nature. This book was released on 2021-09-15 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceedings of the 14th International Conference on Flexible Query Answering Systems, FQAS 2021, held virtually and in Bratislava, Slovakia, in September 2021. The 16 full papers and 1 perspective papers presented were carefully reviewed and selected from 17 submissions. They are organized in the following topical sections: model-based flexible query answering approaches and data-driven approaches.

Theory and Applications of Satisfiability Testing – SAT 2016

Author : Nadia Creignou
Publisher : Springer
ISBN 13 : 3319409700
Total Pages : 564 pages
Book Rating : 4.3/5 (194 download)

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Book Synopsis Theory and Applications of Satisfiability Testing – SAT 2016 by : Nadia Creignou

Download or read book Theory and Applications of Satisfiability Testing – SAT 2016 written by Nadia Creignou and published by Springer. This book was released on 2016-06-10 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceedings of the 19th International Conference on Theory and Applications of Satisfiability Testing, SAT 2016, held in Bordeaux, France, in July 2016. The 31 regular papers, 5 tool papers presented together with 3 invited talks were carefully reviewed and selected from 70 submissions. The papers address different aspects of SAT, including complexity, satisfiability solving, satisfiability applications, satisfiability modulop theory, beyond SAT, quantified Boolean formula, and dependency QBF.

Theory and Applications of Satisfiability Testing – SAT 2019

Author : Mikoláš Janota
Publisher : Springer
ISBN 13 : 3030242587
Total Pages : 425 pages
Book Rating : 4.0/5 (32 download)

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Book Synopsis Theory and Applications of Satisfiability Testing – SAT 2019 by : Mikoláš Janota

Download or read book Theory and Applications of Satisfiability Testing – SAT 2019 written by Mikoláš Janota and published by Springer. This book was released on 2019-06-28 with total page 425 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceedings of the 22nd International Conference on Theory and Applications of Satisfiability Testing, SAT 2019, held in Lisbon, Portugal, UK, in July 2019. The 19 revised full papers presented together with 7 short papers were carefully reviewed and selected from 64 submissions. The papers address different aspects of SAT interpreted in a broad sense, including (but not restricted to) theoretical advances (such as exact algorithms, proof complexity, and other complexity issues), practical search algorithms, knowledge compilation, implementation-level details of SAT solvers and SAT-based systems, problem encodings and reformulations, applications (including both novel application domains and improvements to existing approaches), as well as case studies and reports on findings based on rigorous experimentation.

Reasoning Web. Explainable Artificial Intelligence

Author : Markus Krötzsch
Publisher : Springer Nature
ISBN 13 : 3030314235
Total Pages : 294 pages
Book Rating : 4.0/5 (33 download)

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Book Synopsis Reasoning Web. Explainable Artificial Intelligence by : Markus Krötzsch

Download or read book Reasoning Web. Explainable Artificial Intelligence written by Markus Krötzsch and published by Springer Nature. This book was released on 2019-09-17 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains lecture notes of the 15th Reasoning Web Summer School (RW 2019), held in Bolzano, Italy, in September 2019. The research areas of Semantic Web, Linked Data, and Knowledge Graphs have recently received a lot of attention in academia and industry. Since its inception in 2001, the Semantic Web has aimed at enriching the existing Web with meta-data and processing methods, so as to provide Web-based systems with intelligent capabilities such as context awareness and decision support. The Semantic Web vision has been driving many community efforts which have invested a lot of resources in developing vocabularies and ontologies for annotating their resources semantically. Besides ontologies, rules have long been a central part of the Semantic Web framework and are available as one of its fundamental representation tools, with logic serving as a unifying foundation. Linked Data is a related research area which studies how one can make RDF data available on the Web and interconnect it with other data with the aim of increasing its value for everybody. Knowledge Graphs have been shown useful not only for Web search (as demonstrated by Google, Bing, etc.) but also in many application domains.

Probabilistic Databases

Author : Dan Suciu
Publisher : Morgan & Claypool Publishers
ISBN 13 : 1608456803
Total Pages : 183 pages
Book Rating : 4.6/5 (84 download)

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Book Synopsis Probabilistic Databases by : Dan Suciu

Download or read book Probabilistic Databases written by Dan Suciu and published by Morgan & Claypool Publishers. This book was released on 2011 with total page 183 pages. Available in PDF, EPUB and Kindle. Book excerpt: Probabilistic databases are databases where the value of some attributes or the presence of some records are uncertain and known only with some probability. Applications in many areas such as information extraction, RFID and scientific data management, data cleaning, data integration, and financial risk assessment produce large volumes of uncertain data, which are best modeled and processed by a probabilistic database. This book presents the state of the art in representation formalisms and query processing techniques for probabilistic data. It starts by discussing the basic principles for representing large probabilistic databases, by decomposing them into tuple-independent tables, block-independent-disjoint tables, or U-databases. Then it discusses two classes of techniques for query evaluation on probabilistic databases. In extensional query evaluation, the entire probabilistic inference can be pushed into the database engine and, therefore, processed as effectively as the evaluation of standard SQL queries. The relational queries that can be evaluated this way are called safe queries. In intensional query evaluation, the probabilistic inference is performed over a propositional formula called lineage expression: every relational query can be evaluated this way, but the data complexity dramatically depends on the query being evaluated, and can be #P-hard. The book also discusses some advanced topics in probabilistic data management such as top-k query processing, sequential probabilistic databases, indexing and materialized views, and Monte Carlo databases. Table of Contents: Overview / Data and Query Model / The Query Evaluation Problem / Extensional Query Evaluation / Intensional Query Evaluation / Advanced Techniques

Flexible Query Answering Systems

Author : Henrik L. Larsen
Publisher : Springer Science & Business Media
ISBN 13 : 3790818348
Total Pages : 617 pages
Book Rating : 4.7/5 (98 download)

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Book Synopsis Flexible Query Answering Systems by : Henrik L. Larsen

Download or read book Flexible Query Answering Systems written by Henrik L. Larsen and published by Springer Science & Business Media. This book was released on 2012-08-27 with total page 617 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Semantics in Databases

Author : Leopoldo Bertossi
Publisher : Springer Science & Business Media
ISBN 13 : 3540009574
Total Pages : 237 pages
Book Rating : 4.5/5 (4 download)

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Book Synopsis Semantics in Databases by : Leopoldo Bertossi

Download or read book Semantics in Databases written by Leopoldo Bertossi and published by Springer Science & Business Media. This book was released on 2003-04-07 with total page 237 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Transactions on Large-Scale Data- and Knowledge-Centered Systems LIV

Author : Abdelkader Hameurlain
Publisher : Springer Nature
ISBN 13 : 3662680149
Total Pages : 141 pages
Book Rating : 4.6/5 (626 download)

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Book Synopsis Transactions on Large-Scale Data- and Knowledge-Centered Systems LIV by : Abdelkader Hameurlain

Download or read book Transactions on Large-Scale Data- and Knowledge-Centered Systems LIV written by Abdelkader Hameurlain and published by Springer Nature. This book was released on 2023-10-23 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: The LNCS journal Transactions on Large-scale Data and Knowledge-centered Systems focuses on data management, knowledge discovery, and knowledge processing, which are core and hot topics in computer science. Since the 1990s, the Internet has become the main driving force behind application development in all domains. An increase in the demand for resource sharing across different sites connected through networks has led to an evolution of data- and knowledge-management systems from centralized systems to decentralized systems enabling large-scale distributed applications providing high scalability. This, the 54th issue of Transactions on Large-Scale Data and Knowledge-Centered Systems, contains three fully revised and extended papers and two additional extended keynotes selected from the 38th conference on Data Management - Principles, Technologies and Applications, BDA 2022. The topics cover a wide range of timely data management research topics on temporal graph management, tensor-based data mining, time-series prediction, healthcare analytics over knowledge graphs, and explanation of database query answers.

Database Theory - ICDT 2003

Author : Diego Calvanese
Publisher : Springer Science & Business Media
ISBN 13 : 3540003231
Total Pages : 466 pages
Book Rating : 4.5/5 (4 download)

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Book Synopsis Database Theory - ICDT 2003 by : Diego Calvanese

Download or read book Database Theory - ICDT 2003 written by Diego Calvanese and published by Springer Science & Business Media. This book was released on 2003-02-12 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceedings of the 9th International Conference on Database Theory, ICDT 2002, held in Siena, Italy in January 2002. The 26 revised full papers presented together with 3 invited articles were carefully reviewed and selected from 92 submissions. The papers are organized in topical sections on reasoning about XML schemas and queries, aggregate queries, query evaluation, query rewriting and reformulation, semistructured versus structured data, query containment, consistency and incompleteness, and data structures.

Database Reliability Engineering

Author : Laine Campbell
Publisher : "O'Reilly Media, Inc."
ISBN 13 : 149192621X
Total Pages : 294 pages
Book Rating : 4.4/5 (919 download)

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Book Synopsis Database Reliability Engineering by : Laine Campbell

Download or read book Database Reliability Engineering written by Laine Campbell and published by "O'Reilly Media, Inc.". This book was released on 2017-10-26 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: The infrastructure-as-code revolution in IT is also affecting database administration. With this practical book, developers, system administrators, and junior to mid-level DBAs will learn how the modern practice of site reliability engineering applies to the craft of database architecture and operations. Authors Laine Campbell and Charity Majors provide a framework for professionals looking to join the ranks of today’s database reliability engineers (DBRE). You’ll begin by exploring core operational concepts that DBREs need to master. Then you’ll examine a wide range of database persistence options, including how to implement key technologies to provide resilient, scalable, and performant data storage and retrieval. With a firm foundation in database reliability engineering, you’ll be ready to dive into the architecture and operations of any modern database. This book covers: Service-level requirements and risk management Building and evolving an architecture for operational visibility Infrastructure engineering and infrastructure management How to facilitate the release management process Data storage, indexing, and replication Identifying datastore characteristics and best use cases Datastore architectural components and data-driven architectures