Distributed systems are expected to support mobile computations executed over a computer network of xed and mobile hosts. This paper examines the requirements for structuring such mobile computations that access shared data in a database, argues that opennesting can better facilitate these requirements, and proposes an Open-Nested Transaction model in a mobile environment using the notion of Re...

In this paper, we investigate the issues involved in using multiprocessors for high performance transaction processing applications. We use a simulation model to compare the performance of three different architectures, namely, Shared Everything, Shared Nothing and Shared Disks. In Shared Everything, any processor can access any disk and all memory is shared. In Shared Nothing, neither disks no...

The performance of current transaction processing systems largely depends on human experts for administration and tuning. These experts have to specify a multitude of internal control parameters in different subsystems for which finding appropriate settings is very difficult. Another shortcoming of manual system administration lies in its inability to quickly react to changing system and worklo...

In this paper we describe our experience applying the concepts of reeection to a legacy transaction processing (TP) monitor in order to support the implementation of extended transaction models. In the past ten years, numerous extended transaction models have been proposed to address the challenges posed by new advanced applications. Few practical implementations of these extended transaction m...

Activities of advanced applications can be modeled by interrelated transactions. These relations can be described by diierent kinds of transaction dependencies. The notion of transaction closure is a generalization of nested transactions providing means to describe complex activities such as transactional workkows. In this paper, our main focus lies on execution dependencies for describing cert...

We propose a new measure of support (the number of occurrences of a pattern in a dataset), where we count the number of times a pattern occurs (nearly) in the middle between two other occurrences. The more a pattern occurs in the middle of two occurrences (transaction wise) the more stable or regular the interval between occurrences is. We will define this measure and show how it can be impleme...

This paper compares two approaches to the measurement of the resources devoted to the organisational task in the economy, i.e. Porat and Rubin’s ‘Information Economy’ and Wallis and North’s ‘Transaction Sector’. While there have been a number of studies using the information economy approach, it seems to have made way for a narrower focus on the information technology economy in recent years. T...