Federated query service based on CORBA

The current information technology trend is toward the distribution of data among numbers of autonomous and heterogeneous repositories. Object Query Service is specified by OMG to provide uniform interfaces for users to retrieve information based on predicate based query, despite data heterogeneity. We propose a sophisticated architecture for querying federated information for the CORBA paradigm based on the Object Query Service framework. The dissimilarity between our system and other implementations of Query Service, which focus on query processing and system performance is that we concentrate on the requirements, behaviors, scalability as well as the extensibility of the federated query system from different participants´ points of view. We design a prototype called “Octopus” to demonstrate the feasibility of our architecture. We also share the experiences learned while designing the federated query service