Quantifying schema evolution

Quantifying schema evolution

Achieving correct changes is the dominant activity in the application software industry. Modification of database schemata is one kind of change which may have severe consequences 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 applic...

Desktop Schema Evolution - Editing Schema

In this paper we describe a general framework to do schema evolution. The main idea is desktop, the conceptual workspace to edit schemes. The evolution to be discussed is captured from several points of view; (1) Schema translation causes changing database states. (2) Three kinds of evolutions, type evolution, predicate evolution and complex type evolution are proposed. (3) Completeness propert...

Objektorientierte Schema-evolution Seminar " Schema Evolution " (ws 05/06) Objektorientierte Schema-evolution Inhaltsverzeichnis

Schema Evolution in Heterogeneous

This paper presents a new approach to schema evolution which combines the activities of schema integration and schema evolu tion into one framework In previous work we have developed a general framework to support schema transformation and integration in hetero geneous database architectures Here we show how this framework also readily supports evolution of source schemas allowing the global sc...

Lossless Conditional Schema Evolution

Conditional schema changes change the schema of the tuples that satisfy the change condition. When the schema of a relation changes some tuples may no longer fit the current schema. Handling the mismatch between the intended schema of tuples and the recorded schema of tuples is at the core of a DBMS that supports schema evolution. We propose to keep track of schema mismatches at the level of in...