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International symposium on Parallel and distributed Processing (IPDPS)

作者： M.L. Liu D. Agrawal A. El Abbadi Department of Computer Science Cal Poly State University San Louis Obispo CA USA Department of Computer Science University of California Santa Barbara CA USA

Although managing multiple copies of a database has been the subject of intensive research for quite some time now, it has yet to fulfill its promise in practical applications. In the current state of distributed database technology, data replication, if implemented at all, is typically enforced by the read-one-write-all protocol. More complicated but less restrictive replica control protocols, though a popular topic in research, are not implemented in any widely-used systems. A major reason for this lack of acceptance is that the performance impact of these protocols cannot be easily quantified, since very little existing performance figures of replicated commercial database systems.are available. This paper investigates the overhead of data replication, and compares the performance of a seldom implemented protocol, quorum consensus, with the performance of a widely accepted protocol, primary copy.

关键词： Protocols Computer science distributed databases Control systems Delay Application software database systems Availability Throughput Transaction databases

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MEADEP and its applications in evaluating dependability for air traffic control systems

MEADEP and its applications in evaluating dependability for ...

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Annual symposium on reliability and Maintainability (RAMS)

作者： Dong Tang M. Hecht J. Handal L. Czekalski SoHaR Inc.orporated Beverly Hills USA Federal Aviation Administration Washington D.C. DC USA

MEADEP (measure dependability) is a user-friendly dependability evaluation tool for measurement-based analysis of computing systems.including both hardware and software. Features of MEADEP are: a data processor for converting data in various formats (records with a number of fields stored in a commercial database format) to the MEADEP format, a statistical analysis module for graphical data presentation and parameter estimation, a graphical modeling interface for constructing reliability block and Markov diagrams, and a model solution module for availability/reliability calculation with graphical parametric analysis. Use of the tool on failure data from measurements can provide quantitative assessments of dependability for critical systems. while greatly reducing requirements for specialized skills in data processing, analysis, and modeling from the user. MEADEP has been applied to evaluate dependability for several air traffic control systems.(ATC) and results produced by MEADEP have provided valuable feedback to the program management of these critical systems.

关键词： software measurement Application software Hardware software tools Spatial databases Statistical analysis Parameter estimation Availability Data processing Data analysis

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distributed FILE MANAGER FOR THE TRW EXPERIMENTAL DEVELOPMENT SYSTEM.

Annual Proceedings - Reliability Physics (Symposium)

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Annual proceedings - reliability Physics (symposium) 1979年 322-336页

作者： Danforth, Scott

Since 1976, the Computer Engineering Section at TRW has been using Concurrent Pascal in its multiple-minicomputer signal processing facility for research into the software engineering of special purpose locally distributed systems. In such systems. the particular operating system support required at any processor can be quite specific, removing the necessity for use of typical vendor-supplied general purpose operating systems. Intercomputer link drivers, file systems. graphics packages, and performance monitors are examples of typical services. To these, a simple distributed file manager (DFM) has been added which maintains three possible levels of access control for a file distributed redundantly over any number of machines. The particular services or application code interfaces into the DFM which were decided upon, the operation of the manager and its representation as a collection of Concurrent Pascal system types, and the method of monitoring its performance are discussed.

关键词： Computer networks

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Analysis of large system black-box test data

Analysis of large system black-box test data

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International symposium on software reliability Engineering (ISSRE)

作者： K.C. Clapp R.K. Iyer Y. Levendel AT and T Network Systems Naperville IL USA Center for Reliable and High Performance Computing University of Illinois Urbana-Champaign USA AT and T Bell Laboratories Inc. Naperville IL USA

Studies black box testing and verification of large systems. Testing data is collected from several test teams. A flat, integrated database of test, fault, repair, and source file information is built. A new analysis methodology based on the black box test design and white box analysis is proposed. The methodology is intended to support the reduction of testing costs and enhancement of software quality by improving test selection, eliminating test redundancy, and identifying error prone source files. Using example data from AT&T systems. the improved analysis methodology is demonstrated.< >

关键词： System testing software testing databases Costs Data analysis software quality Redundancy Fault diagnosis Switches High performance computing

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Calculating worst-case execution times of transactions in databases for event-driven, hard real-time embedded systems

Calculating worst-case execution times of transactions in da...

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International symposium on database Engineering and Applications (IDEAS)

作者： A. Munnich G. Farber Institute for Real-Time Computer Systems Technische Universität München Munich Germany

In embedded real-time systems.the use of databases increases, particularly to ensure the quality of data and to simplify the development of software. Especially for safety-critical applications one must guarantee in advance by suitable verification-algorithms that all deadlines hold in all possible cases of use. The worst-case execution time of transactions is an essential input of those algorithms. Therefore, we present here a method to calculate these times for non-distributed, main memory databases in event-driven, embedded hard real-time systems. We use the very powerful means of event-streams and event-dependency-matrices for a detailed description of the embedding environment and an application model to specify the necessary information about the application itself.

关键词： Transaction databases Real time systems Embedded system Embedded computing Embedded software software quality Application software Concurrent computing Humans Production

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Protecting mobile code

Protecting mobile code

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International symposium on software reliability Engineering (ISSRE)

作者： T. Sander International Computer Science Institute Berkeley CA USA

There are at least two major security challenges in mobile code distributed systems. First hosts have to be protected from potentially malicious actions of mobile code they are executing. Many techniques are known which address this problem. Second mobile agents themselves have to be protected against malicious hosts. Satisfactory ways to deal with the second problem are necessary features for many of the (security-sensitive) tasks mobile agent (MA) systems.are envisioned for, e.g., in e-commerce applications where a shopping agent is sent out on the Internet, vendors have a high incentive in tampering with these agents. The key point is is that the originator of the agent needs to have sound guarantees that the results an agent brings back are correct. Why else should he send out the agent in the first place?.

关键词： Cryptography Mobile agents Internet software protection Computer security Electrical capacitance tomography IP networks Data security Application software databases

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Robustness testing of a distributed simulation backplane

Robustness testing of a distributed simulation backplane

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International symposium on software reliability Engineering (ISSRE)

作者： K. Fernsler P. Koopman RS6000 Graphics Development IBM Corporation Austin TX USA Institute for Complex Engineered Systems & Department of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA USA

Creating robust software requires not only careful specification and implementation, but also quantitative measurement. This paper describes Ballista exception handling testing of the High Level Architecture RunTime Infrastructure (HLA RTI). The RTI is a standard distributed simulation system intended to provide completely robust exception handling, yet implementations have normalized robustness failure rates as high as 10%. Non-robust testing responses include exception handler crashes, segmentation violations, "unknown" exceptions, and task hangs. Other issues include different robustness failure modes across ports to two operating systems. and mandatory client machine rebooting after a particular RTl failure. Testing the RTI led to scalable extensions of the Ballista architecture for handling exception-based error reporting models, testing object-oriented software structures (including call-backs, pass by reference, and constructors), and operating in a state-rich, distributed system environment. These results demonstrate that robustness testing can provide useful feedback to high-quality software development processes, and can be applied to domains well beyond the previous work on testing operating systems.

关键词： Robustness Backplanes Vehicle crash testing software testing System testing Object oriented modeling Computer architecture Operating systems software measurement Runtime

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Enabling hypermedia videos in multimedia database systems.coupled with realtime media servers

Proceedings of the International Database Engineering and Ap...

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proceedings of the International database Engineering and Applications symposium, IDEAS 2000年 327-336页

作者： Lindner, Wolfgang Berthold, Henrike Binkowski, Frank Heuer, Andreas Meyer-Wegener, Klaus Univ of Rostock Rostock Germany

The integrated management of standard structured data and time-dependent data is still too complex to be covered by a single system. So there will be distinct systems. such as multimedia DBMS and media servers for, e.g., video data, each doing only what it can do best. However, some functions desired by users and applications necessarily involve both systems. A prime candidate for this is the use of hypermedia link anchors in continuous media. The idea behind this approach is to enhance the client software to improve the interplay between structured data in the database (hypermedia structures and metadata) and the video stream. On initiating the playout of the video, the client receives a list of anchors from the MMDBS and organizes them in local structures. It also receives a handle for the video to be played out and uses it to contact the media server. In this paper, the overall architecture and the role of the different kinds of systems.are shown. Query and update processing will be distributed over the different kinds of servers.

关键词： Hypermedia systems

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The ADNET Communications System: Inter-Process Communication in a Fault Tolerant Local Area Network

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IFAC proceedings Volumes 1983年第18期16卷 233-238页

作者： W.L. Lakin M.R. Moulding Procurement Executive Ministry of Defence Admiralty Surface Weapons Establishment Portsmouth Hants UK Division of Electrical and Electronic Engineering The Hatfield Polytechnic Hatfield Herts UK

An experimental local area network (ADNET) has been developed at the Admiralty Surface Weapons Establishment (ASWE) to investigate the use of a distributed computer architecture for shipborne command and control systems. The ADNET Communications System provides the means by which software processes distributed throughout the network can communicate. At the hardware level it uses the ASWE Serial Highway. This is a polled multi-drop bus which employs hardware redundancy to achieve high reliability. Both broadcast and point-to-point intercomputer message transfers are supported and a high level of error detection and correction is provided. The software of the communications system provides protocols which eliminate the need for a fixed connectively within the network. This allows the applications software to be dynamically reconfigurable and leads to the provision of fault tolerant functions for the network. The ASWE Serial Highway is described together with the software and protocols of the communications system. In addition, the use of the protocols by fault tolerant functions is illustrated by examining the operation of the ASWE distributed database Management System (ADDAM).

关键词： Communications computers applications communications control applications computer applications computer hardware computer interfaces computer software data handling multiprocessing systems parallel processing system failure and recovery

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Performance evaluation of three logging schemes for a shared-nothing database server

Performance evaluation of three logging schemes for a shared...

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International Conference on distributed Computing systems

作者： Kam-Fai Wong Department of Systems Engineering and Engineering Management Chinese University of Hong Kong New Territories Hong Kong China

The European Declarative System (EDS) is a high performance backend database server designed for a range of commercial mainframes. One major application domain of EDS is information processing for business and commercial environments. High performance is achieved by exploiting parallelism using a shared-nothing computer (up to 256 processors). reliability is a crucial design issue for commercial and business information systems. Recovery control facilitates reliability and logging forms an important part of it. In general, logging is costly to implement. It is usually achieved at the expense of reduced system performance. Three logging schemes have been studied for EDS: (a) local discs-adopt a conventional approach by incorporating a local disc on each processor; (b) duplexing-arrange the processors in pairs, one for database operations and one for backup; and (c) cooperative logging-similar to duplexing except database and backup operations are performed on a single processor. The performance of these schemes for on-line transaction processing was evaluated and compared using the EDS behavioural simulator. The results of the evaluations are presented in this paper.

关键词： Business Transaction databases Application software Information processing Parallel processing Concurrent computing High performance computing Information systems System performance

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