- Update Semantics of Relational Views
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A database view is a portion of the data structured in a way suitable to a specific
on views must be translated into updates on the underlying database. This
translation process in the relational model.
The procedure is as follows: first, a “complete” ...
Publication - erhard - 04/17/2013 - 09:38 - 0 comments - 0 attachments
- A formal model for temporal schema versioning in object-oriented databases
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10 - 49
In this paper we present a formal model for the support of temporal schema versions in object-oriented databases. Its definition is partially based on a generic ...
Publication - fgrandi - 04/17/2013 - 08:49 - 0 comments - 0 attachments
- An Axiomatic Model of Dynamic Schema Evolution in Objectbase Systems
... model is proposed for dynamic schema evolution (DSE) in objectbase systems (OBSs) that supports the fundamental concepts of ...
Publication - erhard - 04/17/2013 - 08:49 - 0 comments - 0 attachments
- On lossless tranformation of databases schemes not necessarily satisfying universal instance assumption
... to the original one. This question was addressed in the literature with respect to those relational schemes that satisfy the so ... \"tractable\" We are able to test losslessness defined in such a way for a wide class of relational expressions and dependencies. An ...
Publication - huliganka - 04/17/2013 - 00:27 - 0 comments - 1 attachment
- On the computation of relational view complements
... parts of a given data collection play an important role in many database applications. In dynamic environments where data is updated, not only information provided by ...
Publication - cat - 04/16/2013 - 18:16 - 0 comments - 1 attachment
- Semantics of Database Transformations
... 323.43 KB
Database transformations arise in many different settings including
database integration, evolution of ... paper surveys approaches that have been taken to problems in these settings, assesses their strengths and weaknessesd
develops ...
Publication - erhard - 04/16/2013 - 11:38 - 0 comments - 1 attachment
- Model-Driven, View-Based Evolution of Relational Databases
... between abstraction levels. There exist several mechanisms in order to carry out propagations from one level to another, that are ... of modifications, is a time–consuming process. In this paper we propose a solution that is closer to the lazy and logical mechanisms, in which changes are delayed or not finally realized, respectively. This ...
Publication - jlloret - 04/16/2013 - 08:49 - 0 comments - 0 attachments
- Co-transformations in Information System Reengineering
... WCRE'04 / ATEM'04, Electronic Notes in Theoretical Computer Science, Vol. 137, Is. 3: 5-15
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Publication - huliganka - 04/16/2013 - 07:49 - 0 comments - 0 attachments
- Efficient Maintenance of Temporal Data Warehouses
... the entire history of source databases is not stored in the warehouse; the warehouse keeps enough information for its ... (i.e. non-temporal operators). Although temporal views in V are specified in a temporal algebraic query language we translate them into relational ...
Publication - huliganka - 04/16/2013 - 06:27 - 0 comments - 1 attachment
- Evolving the Implementation of ISA Relationships in EER Schemas
... Proceedings of the Workshop on Evolution and Change in Data Management (ECDM 2006), LNCS 4231, pp. 237-246
... problems related to database evolution
is how to reflect in the data level the changes that have occurred
in the conceptual schema of ...
Publication - jlloret - 04/16/2013 - 06:05 - 0 comments - 0 attachments