A distributed object database stores objects persistently at servers. Applications run on client machines, fetching objects into a client-side cache of objects. If fetching and cache management are done in terms of objects, rather than xed-size units such as pages, three problems must be solved: 1. which objects to prefetch, 2. how to translate, or swizzle, inter-object references when they are...

This paper describes the Multiware Database, a database capable to store and manage complex multimedia documents using the features of both object database management systems and open distributed systems. This multimedia database is a component of the Multiware project, a platform supporting distributed multimedia cooperative applications. Representation of multimedia documents in this system i...

In database and information systems, increasing attention has been focused lately on parallel and distributed database systems. The future of large database systems lies into the realm of distributed computing. The main reason for this is that distributed computing can be constructed at a low cost without the need for any specialized technology, using existing sequential computers and relativel...

Extensibility is one of many claims of improved performance being made for distributed processing systems. Extensibility means system properties, such as "incremental growth and configuration flexibility," "highly adaptable to changes in workload," "incremental replacement and/or upgrading of components (both hardware and software)" and "easily expanded in both capacity and function."2 Although...

Thispaper gives an overview of accessing the userdefined objects across the Oracle ORDB in a distributed environment, which allows application to access the data & objects from a network of two or more homogenous ORDB that natively supports object-model. KeywordsORDB; Distributed database; Object-Model; Userdefined Objects;

Distributed systems are vital for the efficient processing required in military applications. For these applications it is especially important that the distributed database management systems (DDBMS) should operate in a secure manner. For example, the DDBMS should allow users, who are cleared to different levels, access to the database consisting of data at a variety of sensitivity levels with...

While the notion of a Distributed DBMS has been familiar to the IT industry for several decades, within telecom networks the subscriber data management based on DDBMS technology is a novel addition to a service provider's infrastructure. Service providers are used to telecom networks that are efficient, reliable and easy to maintain and operate, in part thanks to the node model used in designin...

Recently, there has been an increased interest in incorporating in database management systems rank-aware query operators, such as top-k queries, that allow users to retrieve only the most interesting data objects. In this paper, we propose a cache-based approach for efficiently supporting top-k queries in distributed database management systems. In large distributed systems, the query performa...

We propose an inference prevention agent as a tool that enables each of the databases in a distributed system to keep track of probabilistic dependencies with other databases and then use that information to help preserve the confidentiality of sensitive data. This is accomplished with minimal sacrifice of the performance and survivability gains that are associated with distributed database sys...

This paper investigates the suitability of the mobile agents approach to the problem of integrating a collection of local DBMS into a single heterogeneous large-scale distributed DBMS. The paper proposes a model of distributed transactions as a set of mobile agents and presents the relevant execution semantics. In addition, the mechanisms which are needed to guarantee the ACID properties in the...