Data warehouses (DWs) can become inconsistent when some dimensional constraints are not satisfied by the dimension instances. In this paper, we present preliminary results about the effects of the violation of partitioning constraints in homogeneous dimension instances over aggregation queries, and in particular over the summarizability property (SUMM) of the DWs. We are interested in finding w...

To achieve full end-to-end traceability it is crucial to create the physical and operational conditions necessary for enforcing validation and quality rules and maintaining the traceability data chain. It means using available technology to seamlessly integrate traceability data, make it error proof and ensure that it can be effortlessly accessed in real-time.This paper outlines the ways in whi...

The TEAMSAT project came into existence in mid November 1996 when a budget of 750 KAU was provided to enable young engineers and students to exploit the opportunity offered by the Ariane 502 test flight to install some experiments in a module aboard the MAQSAT instrumented test platform. Thanks to the enthusiasm of the team and the generous inhouse support, facilities and expertise provided at ...

MapReduce systems have become popular for processing large data sets and are increasingly being used in e-science applications. In contrast to simple application scenarios like word count, e-science applications involve complex computations which pose new challenges to MapReduce systems. In particular, (a) the runtime complexity of the reducer task is typically high, and (b) scientific data is ...

This article provides a brief historical review in the field of creation and use of distributed systems for computerized accumulation and information processing (handling) in Soviet Union, and especially in its scientific centers such as Joint Institute for Nuclear Research and not only. The author tries to demonstratehow the chosen methods and ideas permitted to realize the systems, which coul...

Data warehouses (DWs) can become inconsistent when some dimensional constraints are not satisfied by the dimension instances. In this paper, we present preliminary results about the effects of the violation of partitioning constraints in homogeneous dimension instances over aggregation queries, and in particular over the summarizability property (SUMM) of the DWs. We are interested in finding w...

The Collider Detector at Fermilab (CDF) records proton-antiproton collisions at center of mass energy of 2.0 TeV at the Tevatron collider. A new collider run, Run II, of the Tevatron started in April 2001. Increased luminosity will result in about 1 PB of data recorded on tapes in the next two years. Currently the CDF experiment has about 260 TB of data stored on tapes. This amount includes raw...

We report on the production experience of the DØ experiment at the Fermilab Tevatron, using the SAM data handling system with a variety of computing hardware configurations, batch systems, and mass storage strategies. We have stored more than 300 TB of data in the Fermilab Enstore mass storage system. We deliver data through this system at an average rate of more than 2 TB/day to analysis progr...