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Bridging the Gap between Comparison and Conforming the Views in View Integration
Karlstads universitet, Fakulteten för ekonomi, kommunikation och IT, Avdelningen för informatik och projektledning. (Informatik och Projektledning)ORCID-id: 0000-0002-0419-1647
2006 (engelsk)Inngår i: Local Proceedings of the 10th East-European Conference on Advances in Databases and Information Systems / [ed] Manolopoulos, Y., Pokorný, J. & Sellis, T., 2006, s. 184-199Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

View integration is a complex, error-prone and time-consuming task.Therefore there is a need to decompose the integration methods into smallerwell defined phases where different techniques are applied. Most of themethods used today is composed of, or at least is a mixture of, the followingfour phases: pre-integration, comparison of the views, conforming the viewsand merging and restructuring, and most of the methods put focus on phase 2and 3. Despite of this there is a gap between these two phases. To bridge thisgap a framework has been developed. In the framework Inference Rules (IR)are used, together with Enterprise Modeling (EM) as the canonical modelinglanguage, to deduce dependencies that are not conflicting from dependenciesthat are or have been identified as an inter-schema property. Three researchquestions regarding why, how and when IR should be applied in viewintegration are analyzed and discussed and it is argued that the framework maynot only improve view integration as such but also improve the applied conflictand inter-schema resolution techniques.

sted, utgiver, år, opplag, sider
2006. s. 184-199
HSV kategori
Forskningsprogram
Informatik
Identifikatorer
URN: urn:nbn:se:kau:diva-5534OAI: oai:DiVA.org:kau-5534DiVA, id: diva2:309901
Konferanse
10th East-European Conference on Advances in Databases and Information Systems
Tilgjengelig fra: 2010-04-09 Laget: 2010-04-09 Sist oppdatert: 2019-07-12bibliografisk kontrollert
Inngår i avhandling
1. Schema Integration: How to Integrate Static and Dynamic Database Schemata
Åpne denne publikasjonen i ny fane eller vindu >>Schema Integration: How to Integrate Static and Dynamic Database Schemata
2010 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Schema integration is the task of integrating several local schemata into one global database schema. It is a complex, error-prone and time consuming task. Problems arise in recognizing and resolving problems, such as differences and similarities, between two schemata. Problems also arise in integrating static and dynamic schemata. In this thesis, three research topics are addressed: Maintaining Vocabulary in Schema Integration, Integration of Static Schemata and Integration of Static and Dynamic Schemata, while applying the notation in the Enterprise Modeling approach.

In Maintaining Vocabulary in Schema Integration an analysis of what semantic loss is and why it occurs in schema integration is conducted. Semantic loss is a problem that should be avoided because both concepts and dependencies might be lost. In the thesis, it is argued that concepts and dependencies should be retained as long as possible in the schemata. This should facilitate user involvement since the users’ vocabulary is retained even after resolving similarities and differences between two schemata.

In Integration of Static Schemata two methods are developed. These methods facilitate recognition and resolution of similarities and differences between two conceptual database schemata.  By applying the first method, problems between two schemata can be recognized that otherwise could pass unnoticed; by applying the second method, problems can be resolved without causing semantic loss by retaining concepts and dependencies in the schemata.

In Integration of Static and Dynamic Schemata a method on how to integrate static and dynamic schemata is developed. In the method, focus is put on pre- and post-conditions and how to map these to states and state changes in the database. By applying the method, states that are important for the database can be designed and integrated into the conceptual database schema. Also, by applying the method, active database rules can be designed and integrated into the conceptual database schema.

sted, utgiver, år, opplag, sider
Karlstad: Karlstads universitet, 2010. s. 346
Serie
Karlstad University Studies, ISSN 1403-8099 ; 2010:13
Emneord
Schema Integration, Conceptual Database Design, Database Schemata, Enterprise Modeling
HSV kategori
Forskningsprogram
Informatik
Identifikatorer
urn:nbn:se:kau:diva-5541 (URN)978-91-7063-299-0  (ISBN)
Disputas
2010-05-28, Frödingsalen 1B 364, Karlstads universitet, Karlstad, 13:15 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2010-05-06 Laget: 2010-04-09 Sist oppdatert: 2019-07-12bibliografisk kontrollert
2. View Integration in Conceptual Database Design: Problems, Approaches and Solutions
Åpne denne publikasjonen i ny fane eller vindu >>View Integration in Conceptual Database Design: Problems, Approaches and Solutions
2006 (engelsk)Licentiatavhandling, med artikler (Annet vitenskapelig)
Abstract [en]

View integration is a complex and time-consuming task because there are several problems that need to be addressed. Two such problems are conflict identification and conflict resolution. Conflicts occur because end users may define concepts on different levels of abstraction and because end users may name concepts differently. Therefore there is a need for methods that can cope with these problems when applying the chosen conceptual modeling language. The aim of this thesis is to develop a method for view integration in conceptual database design in which the dependencies of the Enterprise Modeling approach are applied. For this purpose four research studies have been conducted and each study is presented in one paper. In the first study the problem of semantic loss during view integration is addressed; in the second, the problems of identification and resolution of the homonym conflicts are addressed; in the third, the problem of how to define both databases and software components using Enterprise Modeling as a generic and integrated approach are addressed; and finally, in the fourth study, the problems of applying inference rules for conflict simplification or resolution and for interschema property simplification or resolution are addressed. These research studies together with the five introductory chapters contribute to answering the overall research question: In what way is view integration supported by applying the semantic dependencies of the Enterprise Modeling approach? In this thesis it is argued that using the dependencies of the Enterprise Modeling approach simplifies the view integration process and using the proposed resolution techniques for name conflicts reduces the possibility of semantic loss occurring.

sted, utgiver, år, opplag, sider
Karlstad: Karlstads universitet, 2006
Serie
Karlstad University Studies, ISSN 1403-8099 ; 2006:5
HSV kategori
Forskningsprogram
Informatik
Identifikatorer
urn:nbn:se:kau:diva-14516 (URN)9170630364 (ISBN)
Tilgjengelig fra: 2012-08-20 Laget: 2012-08-20 Sist oppdatert: 2019-07-12bibliografisk kontrollert

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