... Skarra, A Zdonik, S ... such may be modified and shared. The effects of changing a type extend to objects of the type and to programs that use objects of the ...
Publication - cat - 06/15/2023 - 14:51 - 0 comments - 1 attachment
... McBrien, P; Poulovassilis, A Author: ... Poulovassilis, A Year: ...
Publication - cat - 09/13/2022 - 17:45 - 0 comments - 0 attachments
... design (CAD) systems. In this paper we address a broad spectrum of semantic and operational issues in version control for a public/private distributed architecture of CAD systems. The research issues ...
Publication - cat - 07/28/2016 - 08:29 - 0 comments - 0 attachments
... 277.31 KB Database systems offering a multidimensional schema on a logical level (e.g. OLAP systems) are often used in data warehouse ...
Publication - cat - 04/17/2013 - 12:49 - 0 comments - 1 attachment
... KB This paper describes work carried out on a model for the versioning of class definitions in an object-oriented database. ... on attributes of the previous and current version of a class definition, instances of any version of the class can be converted to ...
Publication - cat - 04/17/2013 - 12:38 - 0 comments - 1 attachment
... for database applications. The paper presents a method for measuring modifications to database schemata and their consequences, by using a thesaurus tool. Measurements of the evolution of a large-scale database application currently running in several hospitals in ...
Publication - cat - 04/17/2013 - 10:27 - 0 comments - 0 attachments
... prototype data translation system which can access a wide variety of data and restructure it for new uses. The system is driven ... presented. The DEFINE description is compiled into a customized PL/l program for accessing source data. The restructuring ...
Publication - erhard - 04/17/2013 - 10:16 - 0 comments - 0 attachments
... 420.56 KB Schema evolution is a problem that is faced by long-lived data. When a schema changes, existing persistent data can become inaccessible unless the ... the database maintainer can perform. We have developed a model of type changes involving multiple types. The model describes both type ...
Publication - erhard - 04/17/2013 - 10:05 - 0 comments - 1 attachment
... 100 - 499 A database view is a portion of the data structured in a way suitable to a specific on views ...
Publication - erhard - 04/17/2013 - 09:38 - 0 comments - 0 attachments
... N Keller, A Wiederhold, G ... The view-object model provides a formal basis for representing and manipulating object-based views on ...
Publication - erhard - 04/17/2013 - 09:38 - 0 comments - 0 attachments
... 100 - 499 When a database is shared by many users, updates to the database schema are almost always prohibited because there is a risk of making existing application programs obsolete when they run against ...
Publication - cat - 04/17/2013 - 06:38 - 0 comments - 0 attachments
... Rundensteiner, Elke A.; Koeller, Andreas; Zhang, Xin ... E Koeller, A Zhang, X ...
Publication - cat - 04/17/2013 - 06:16 - 0 comments - 1 attachment
... 36.23 KB Schema Evolution is the ability of a database system to respond to changes in the real world by allowing the ... to evolve. In many systems this property also implies a retaining of past states of the schema. This latter property is necessary if ...
Publication - cat - 04/17/2013 - 05:16 - 0 comments - 1 attachment
... they seldom support automatic propagation mechanisms. A proposal is described that enables Sherpa to fully support the propagation of ... It extends previous classification mechanisms with a dynamic capability which adequately supports evolving class definitions and ...
Publication - cat - 04/16/2013 - 18:49 - 0 comments - 1 attachment
... Habermann, A Year: ... complex schema changes, but also database reorganization. A database administrator uses a declarative notation to describe mappings ...
Publication - cat - 04/16/2013 - 17:38 - 0 comments - 1 attachment
... 1.28 MB This paper presents a version model which handles database schema changes and which takes evolution ... development of partial schema versions, or views of a schema. These versions are created in the same database from a common ...
Publication - cat - 04/16/2013 - 11:38 - 0 comments - 1 attachment
... 499 Schema versioning is one of a number of related areas dealing with the same general problem - that of ... structure. Schema versioning and schema evolution offer a solution to the problem by enabling intelligent handling of any temporal ...
Publication - cat - 04/16/2013 - 04:49 - 0 comments - 0 attachments
... multiple copies of object descriptions have to coexist in a single database. A scheme is proposed that enables users to explicitly deal with these object ...
Publication - cat - 04/15/2013 - 22:49 - 0 comments - 0 attachments
... exclusively on versioning single design objects. In a multi-user design environment where the schema (definition) of the design ... the single design objects. In this paper, we propose a model of versions of schema by extending our model of versions of single ...
Publication - cat - 04/15/2013 - 21:05 - 0 comments - 1 attachment
