Federated Schemata in ODMG
نویسندگان
چکیده
Due to the increasing acceptance of database management systems, many enterprises store most of their information in such databases. Unfortunately , the diversity of database management systems frequently leads to the situation, that diierent units of an enterprise use diierent systems or at least incompatible schemata, which makes it very burdensome to exchange data between these units. To increase eeciency of these existing databases, and to feed new applications in a homogenized fashion, it is getting more and more necessary to make the databases interoper-able and to provide a uniied access to them. This paper describes an approach to introduce the notion of virtual classes into the evolving object database standard ODMG{93. These virtual classes can be used to establish a federation database which is capable of importing and exporting data from and to other databases, to integrate (or just to provide in parallel) information from diierent data bases, and to tailor the overall schema for speciic applications.
منابع مشابه
Extending ODMG for Federated Database Systems
for Federated Database Systems Elke Radeke C-LAB F urstenalle 11, 33102 Paderborn, Germany [email protected], http://www.c-lab.de/ elke Abstract A federated database system (FDBS) allows a uniform and transparent access to the data of multiple heterogeneous DBS. Therefore the federation layer converts the heterogeneous data into a canonical data model. Object-oriented data models are shown to be m...
متن کاملMetadata Management in Federated Multimedia Systems
A Federated Information System requires that multiple (often heterogenous) information systems are integrated to the extent that they can share data through views. One issue faced during the construction of federated view schemata is the continuous need to extract metadata from cooperating systems. This is more pressing in the case of federated multimedia systems where needless transfer of larg...
متن کاملUsing Stored Behaviour in Object-Oriented Databases
The existing standard for object-oriented databases (ODMG) provides no facility for storing behaviour. This lack of stored behaviour introduces problems for generic applications as well as multimedia and federated database systems. Research by others on this issue has resulted in proprietary solutions using non-standard object-oriented database models. This paper discusses types of behaviour in...
متن کاملVHDBS: A Federated Database System for Electronic Commerce Abstract During a German Telekom industrial research project, we designed and developed the VHDBS system, a federated database system for integrating information from pre-exi-
During a German Telekom industrial research project, we designed and developed the VHDBS system, a federated database system for integrating information from pre-existing and legacy databases. We are now going to apply VHDBS for eCommerce scenarios, where database access is of central importance. VHDBS is based on the OMG/CORBA 2.0 and ODMG 2.0 standards and offers an object-oriented data model...
متن کاملSQL3/ODMG-93 Integration through MIMO
MIMO is a model that tries to integrate some of the main current object models (SQL3, ODMG-93, UML), covering all the database development phases. It is defined in the framework of the ENEASIBD project, that is being developed by the “Grupo de Bases de Datos Avanzadas ” at “Universidad Carlos III” (Madrid, Spain). An objective of ENEAYBD is to allow generation of ODMG-93 andor SQL3 schemata >om...
متن کامل