Materialized view selection is one of the crucial decisions in designing a data warehouse for optimal efficiency. Static selection of views may materialize certain views that are not beneficial as the data and usage trends change over time. On the contrary, dynamic selection of views works better only for queries demanding a high degree of aggregation. These facts point to the need for a techni...

We review in this paper both a framework for integrating the treatment of advanced update problems in deductive databases and the architecture of the FOLRE deductive database management system prototype, which extends the basic updating facilities provided by current deductive database systems. The distinguishing feature of our approach is the underlying integrative framework used to specify an...

This paper describes the direct relationship between the perception of citizenship and its material expression, with emphasis on how changing expression obliges a rethink of the channels of mediation between citizens and their elected leaders. An analysis of the French voting ritual will show how our voting system is embedded in a specific cultural conception of citizenship . The emergence of n...

The most effective technique to enhance performances of multidimensional databases consists in materializing redundant aggregates called views. In the classical approach to materialization, each view includes all and only the measures of the cube it aggregates. In this paper we investigate the benefits of materializing views in vertical fragments, aimed at minimizing the workload response time....

This paper is an extended abstract of [5], which discusses the incremental maintenance of materialized ontologies in a rule-enabled Semantic Web. The reader may wonder how this relates to Datalog, a language that has been proposed in the deductive database context. However, the semantics underlying Web ontology languages can often be realized by translating the ontology into appropriate Datalog...

A method is described for actively interfacing an Object-Oriented Database Management System (OODBMS) to application pre grams. The method, called a database monitor, observes how values of derived or stored attributes of database objects change over time. Whenever such a value change is observed, the OODBMS invokes tracking procedures within running application programs. The OODBMS associates ...

With the emergence of XML as a new standard for representing business data, new decision-support applications (namely, XML data warehouses) are being developed. To ensure their feasibility, the issue of performance must be addressed. Performance in general, and the efficiency of performance optimization techniques in particular, is usually assessed with the help of benchmarks. However, there ar...

Since XML is used as a storage format in an increasing number of applications, security has become an important issue in XML databases. One aspect of security is restricting access to data by certain users. This can, for example, be achieved by means of access rules or XML security views, which define projections over XML documents. The usage of security views avoids information leakage that ma...