... KB We examine the problem of type evolution in an object-oriented database environment. Type definitions are persistent objects in the database and as such may be modified and shared. The effects of changing ...
Publication - cat - 06/15/2023 - 14:51 - 0 comments - 1 attachment
... integration and schema evolution into one framework. In previous work we have developed a general framework to support schema transformation and integration in heterogeneous database architectures. Here we show how this framework also ...
Publication - cat - 09/13/2022 - 17:45 - 0 comments - 0 attachments
... of the most important functions which need to be supported in integrated computer-aided design (CAD) systems. In this paper we address a broad spectrum of semantic and operational issues in ...
Publication - cat - 07/28/2016 - 08:29 - 0 comments - 0 attachments
... on a logical level (e.g. OLAP systems) are often used in data warehouse environments. The user requirements in these dynamic application areas are subject to frequent changes. This ...
Publication - cat - 04/17/2013 - 12:49 - 0 comments - 1 attachment
... out on a model for the versioning of class definitions in an object-oriented database. By defining update and backdate functions on ... an old version of the schema to still use data created in the format of the changed schema. (no paper type, object-oriented, ...
Publication - cat - 04/17/2013 - 12:38 - 0 comments - 1 attachment
... Achieving correct changes is the dominant activity in the application software industry. Modification of database schemata is ... of a large-scale database application currently running in several hospitals in the UK are presented and interpreted. The kind of ...
Publication - cat - 04/17/2013 - 10:27 - 0 comments - 0 attachments
... for accessing source data. The restructuring specified in CONVERT is compiled into a set of customized PL/l procedures to derive ... requests. The architecture of EXPRESS allows efficiency in execution by avoiding unnecessary secondary storage references while at the ...
Publication - erhard - 04/17/2013 - 10:16 - 0 comments - 0 attachments
... and then produces a transformer that can update data in a database to correspond to a newer version of the schema. (no paper ...
Publication - erhard - 04/17/2013 - 10:05 - 0 comments - 1 attachment
... 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
... manipulating object-based views on relational databases. In this paper, we present a scheme for handling update operations on view ...
Publication - erhard - 04/17/2013 - 09:38 - 0 comments - 0 attachments
... view system to support capacity-augmenting views. In this paper, we present algorithms that implement the complete set of typical ...
Publication - cat - 04/17/2013 - 06:38 - 0 comments - 0 attachments
... is the ability of a database system to respond to changes in the real world by allowing the schema to evolve. In many systems this property also implies a retaining of past states of the ...
Publication - cat - 04/17/2013 - 05:16 - 0 comments - 1 attachment
... efforts directed towards evolving data definitions in object-oriented database systems. The emphasis is on their ability to ... modified. This approach is an extension of techniques used in artificial intelligence for knowledge representation. It extends previous ...
Publication - cat - 04/16/2013 - 18:49 - 0 comments - 1 attachment
... simple changes to individual schemas. As described in this paper, OTGen supports not only more complex schema changes, but also ... to the new definitions, thus facilitating improvements in performance, functionality, and usability of the database. (Conference, ...
Publication - cat - 04/16/2013 - 17:38 - 0 comments - 1 attachment
... which takes evolution into account. Its originality is in allowing the development of partial schema versions, or views of a schema. These versions are created in the same database from a common schema. We define the set of authorised ...
Publication - cat - 04/16/2013 - 11:38 - 0 comments - 1 attachment
... heterogeneous schemata for various database related tasks. In particular, schema versioning, and its weaker companion, schema evolution, ... to retain current data and software system functionality in the face of changing database structure. Schema versioning and schema ...
Publication - cat - 04/16/2013 - 04:49 - 0 comments - 0 attachments
... 100 - 499 In engineering applications, multiple copies of object descriptions have to coexist in a single database. A scheme is proposed that enables users to explicitly ...
Publication - cat - 04/15/2013 - 22:49 - 0 comments - 0 attachments
... have been proposed and implemented. However, research in versions has been focused exclusively on versioning single design objects. In a multi-user design environment where the schema (definition) of the ...
Publication - cat - 04/15/2013 - 21:05 - 0 comments - 1 attachment
