Istituto di Scienza e Tecnologie dell'Informazione     
Aloia N., Barneva S., Rabitti F. Supporting physical independence in an object database server. In: ECOOP'92 - 6th European Conference on Object-Oriented Programming (Utrecht, The Netherlands, June/July 1992). Proceedings, pp. 397 - 412. O. Lehrmann Masden (ed.). (Lecture notes in computer science, vol. 615). Springer, 1992.
An approach for supporting physical independence in Object Database Servers is proposed in this paper. While in current implementations the strategy for storing data objects reflects the logical object definitions, a certain degree of independence in the physical database orgnnization would be essential to meet specific performance requirements. In this paper, a canonical object data model and a storage object data model are presented. In the first, the objects are organized in c1asses; in the second, physical objects with similar structures are grouped in collections. Mechanisms for mapping data structures and operations from the logical level to the physical level are discussed, and a comprehensive example is given.

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