منابع مشابه
Design Support for Database Federations
Proc. 18 International Conference on Conceptual Modeling (ER'99, Paris, Nov.'99), LNCS, Springer-Verlag, 1999. Federated database systems provide a homogeneous interface to possibly heterogeneous local database systems. This homogeneous interface consists of a global schema which is the result of a logical integration of the schemata of the corresponding local database systems and le systems. I...
متن کاملSpecifying Global Behaviour in Database Federations
We discuss the impact of locally implemented behaviour on global behaviour specification in a federation of object-oriented databases. In particular, given a specification of an integrated view of a number of component databases, we discuss the process of determining the global methods that are implicitly implemented by a given set of local methods on these component databases. To this end, we ...
متن کاملMaintenance and Mediation in Database Federations
This paper proposes a novel approach to the processing of global queries in a tight federation of heterogeneous relational databases. It is based on query correspondence assertions, which are declarative rules that describe semantic correspondences between different relational schemas. A mediator uses these rules to translate queries against the federated schema into semantically contained sequ...
متن کاملQuery Modification in Object-Oriented Database Federations
W e discuss the modification of queries against a n integrated view in a federation of object-oriented databases. W e present a generalisation of existing algorithms for simple global query processing that works fo r arbitrarily defined integration classes. W e then extend this algorithm to deal with object-oriented features such as queries involving path expressions and nesting. W e show how p...
متن کاملA metadata approach to multimedia database federations
Recent research in federated database systems has advanced in the direction of federations of multimedia databases. However, in each project studied, there has been little emphasis placed on the subject of meta-models. Conversely, standard database systems (relational, object-relational and object-oriented) define metadata models that lack multimedia and federation features. In this paper, a sp...
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ژورنال
عنوان ژورنال: Australasian Journal of Information Systems
سال: 2000
ISSN: 1449-8618,1449-8618
DOI: 10.3127/ajis.v8i1.261