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Persistent Object Systems pp 479–502Cite as

A Global Perspective of Schema Modification Management for Object-Oriented Databases

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Part of the book series: Workshops in Computing ((WORKSHOPS COMP.))

Abstract

Schema Modification Management (SMM) is concerned about how schema changes should affect the object base in order to make database objects be compatible with specifications after change. However, a particular problem with existing SMM approaches is the lack of concern for schema-level changes (which may involve multiple classes), or semantic dependencies which applies between non-consecutive versions of the schema.

The presented approach adopts a schema versioning approach to SMM (allowing multiple schema versions to coexist), and promotes a global perspective of change management A powerful means is provided for specifying the presence and maintenance of arbitrary semantic relationships between classes and properties as defined for any schema version in the derivation hierarchy. The fundamental assumption is that semantic dependencies between schema versions do not only follows the derivation relationship, but may go in any directions. To ensure the database behaves consistently as regarded within any schema version context, it is essential that all semantic dependencies are maintained.

The approach is able to handle schema version derivations in arbitrary directions, including complex modifications to the class hierarchy, and in accordance with the inherently unpredictable nature of change.

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Author information

Authors and Affiliations

  1. Department of Computer Science, Norwegian Institute of Technology (NTH), N-7034 Trondheim-NTH, Norway

    Erik Odberg

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  1. Erik Odberg
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Editor information

Editors and Affiliations

  1. Department of Computing Science, University of Glasgow, 8-17 Lilybank Gardens, Glasgow, G12 8RZ, UK

    Malcolm Atkinson BA, MA, PhD, Dip.Comp.Sci., FRSE

  2. Department of Computer Science and Engineering, Oregon Graduate Institute, Portland, Oregon, 97291-1000, USA

    David Maier BA, PhD

  3. Université de Paris I — Panthéon — Sorbonne, 12 Place du Panthéon, 75005, Paris, France

    Véronique Benzaken PhD

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© 1995 British Computer Society

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Odberg, E. (1995). A Global Perspective of Schema Modification Management for Object-Oriented Databases. In: Atkinson, M., Maier, D., Benzaken, V. (eds) Persistent Object Systems. Workshops in Computing. Springer, London. https://doi.org/10.1007/978-1-4471-2122-0_39

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  • DOI: https://doi.org/10.1007/978-1-4471-2122-0_39

  • Publisher Name: Springer, London

  • Print ISBN: 978-3-540-19912-0

  • Online ISBN: 978-1-4471-2122-0

  • eBook Packages: Springer Book Archive

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