Principles of Distributed Object Database Languages

Todays information systems are based on an architecture built up of object servers and client applications that are distributed in a network of multiple heterogeneous computing platforms In this environment distributed object database systems provide e cient and reliable storing querying and updating of a large diversity of objects The concern of this paper are database languages for uniformquerying and updating of distributed objects The fundamental principles of languages for distributed object database systems are presented such that based on that languages for centralised object databases can be extended for managing distribution Five di erent distribution architectures with decreasing degree of local autonomy and increasing degree of global control are presented for each of which the power of the distributed object database language is compared