Database system architectures face a rapidly evolving operating environment where millions of users store and access terabytes of data. To cope with increasing demands for performance highend DBMS employ parallel processing techniques coupled with a plethora of sophisticated features. However, the widely adopted work-centric thread-parallel execution model entails several shortcomings that limi...

This paper deals with the principles of rule-based systems in databases and gives an overview of existing approaches. First, we introduce the concept of rules. The application of rule-based systems to databases is categorized. Deductive database systems are introduced as the first extension of classical database management systems. We briefly describe the concept of deductive databases and thei...

Active Database Systems (ADBSs) provides a good infrastructure to define and execute active rules. Nevertheless, this infrastructure offered by ADBSs does not completely satisfy the necessities of rules management that demands current business applications. Rules also need to be stored in appropriate structures to facilitate their management, as the existing structures for data in these systems...

We point out the existence of a disturbing deficiency in the field of system identification, namely the fact that many results, published in papers, are not reproducible. In many cases, datasets and time series, that are used to illustrate identification methods and algorithms in these publications, are not freely available. We propose to remedy this serious deficiency by setting up a publicall...

In today’s world, organizations like Google, Yahoo, Amazon, Facebook etc. are facing drastic increase in data. This leads to the problem of capturing, storing, managing and analyzing terabytes or petabytes of data, stored in multiple formats, from different internal and external sources. Moreover, new applications scenarios like weather forecasting, trading, artificial intelligence etc. need hu...

The representation and manipulation of synchronization and other temporal relationships among multimedia operations aTe important issues in multimedia database systems. This paper presents a conceptual model for multimedia database systems. This model extends the object-oriented data model by introducing a new abstraction mechanism for specifying temporal relationships among multimedia objects....

Orthogonal persistence ensures that information will exist for as long as it is useful, for which it must have the ability to evolve with the growing needs of the application systems that use it. This may involve evolution of the data, meta-data, programs and applications, as well as the users’ perception of what the information models. The need for evolution has been well recognised in the tra...

The goal of the Persistent Programming Research Group is the provision of an environment which incorporates the principle of orthogonal persistence in order to facilitate the production of large and complex software. A database management system constitutes such software and in this paper we show how a persistent store assists in the construction of such a system. We show that a small number of...

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This paper describes a customized database and a comprehensive set of queries that can be used for systematic benchmarking of relational database systems. Designing this database and a set of carefully tuned benchmarks represents a first attempt in developing a scientific methodology for performance evaluation of database management systems. We have used this database to perform a comparative e...