Changes in the real world may require both the database population and the database schema to evolve. Particularly, this is the case in CAD/CAM and CASE database systems, in which the design objects constantly evolve in every aspect. On the otherhand, the prototyping of a database design may also involve changes to both the structure and behavior of a schema. Unfortunately, most of the current systems offer little support for schema evolution. In this paper, we survey the recent development ofthe research in the schema evolution of object-oriented databases. The main issues in the current research are identified.
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