Proceedings of 3rd International Conference on Parallel and Distributed Information Systems

28-30 Sept. 1994

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Displaying Results 1 - 25 of 36
  • DataJoiner: a practical approach to multi-database access

    Publication Year: 1994
    Cited by:  Papers (1)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (59 KB)

    Summary form only given. As a result of the trend towards client/server and open systems over the last decade, businesses are finding that they have useful data distributed across multiple DBMSs. DataJoiner is a new database middleware product that provides client applications with a unified view of this diverse data. It will enable and simplify the development of complex decision support applicat... View full abstract»

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  • Proceedings of 3rd International Conference on Parallel and Distributed Information Systems

    Publication Year: 1994
    Request permission for commercial reuse | PDF file iconPDF (27 KB)
    Freely Available from IEEE
  • Checkpointing distributed applications on mobile computers

    Publication Year: 1994, Page(s):73 - 80
    Cited by:  Papers (72)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 KB)

    The integration of mobile/portable computing devices within existing data networks can be expected to spawn distributed applications that execute on mobile hosts (MHs). For reliability, it is vital that the global state of such applications be checkpointed from time to time. A global checkpoint consists of a set of local checkpoints, one per participant. This paper first identifies the problems in... View full abstract»

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  • Location management in distributed mobile environments

    Publication Year: 1994, Page(s):81 - 88
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (712 KB)

    Location management is an important problem in distributed mobile computing. Location management consists of location updates, searches and search-updates. An update occurs when a mobile host changes location. A search occurs when a mobile host needs to be located. A search-update occurs after a successful search. Various strategies can be designed for search, update and search-update. Static loca... View full abstract»

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  • The evolution of customer middleware requirements

    Publication Year: 1994, Page(s):262 - 263
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (64 KB)

    In the past, commercial client/server systems were typically limited to configurations employing a single relational database management system (DBMS). Moreover, both client and server components were either designed by a single vendor, or constructed using one of the many application programming interfaces (API) available, restricting that application for use with the single DBMS for which that A... View full abstract»

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  • Distributed selective dissemination of information

    Publication Year: 1994, Page(s):89 - 98
    Cited by:  Papers (10)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (836 KB)

    To help users cope with information overload, selective dissemination of information (SDI) will increasingly become an important tool in wide area information systems. In an SDI service, users post their long term queries, called profiles, at some SDI servers and continuously receive new, filtered documents. To scale up with the volume of information and the size of user population, we need a dist... View full abstract»

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  • Interdatabase existence dependencies: a metaclass approach

    Publication Year: 1994, Page(s):213 - 216
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    We present a novel approach to deal with the modeling and operational aspects of the interdatabase existence dependency problem. By extending our canonical model BLOOM with high level abstractions (metaclasses) for the different kinds of existence dependencies and their corresponding enforcement policies, inter-dependencies are declaratively specified and their behavior embodied into the model by ... View full abstract»

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  • Secure access to data over the Internet

    Publication Year: 1994, Page(s):99 - 102
    Cited by:  Papers (3)  |  Patents (28)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    Security issues are the major roadblock currently preventing greater access to databases over the Internet. In this paper, we propose a framework for secure access to databases by a wide audience over the Internet, using World Wide Web information servers, a modified version of the NCSA Mosaic Internet browser and role wrappers (software modules that assign roles to incoming database requests, bas... View full abstract»

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  • Fault-tolerant distributed garbage collection in a client-server object-oriented database

    Publication Year: 1994, Page(s):239 - 248
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (788 KB)

    We present a scalable garbage collection scheme for systems that store objects at multiple servers while clients run transactions on locally cached copies of objects. It is the first scheme that provides fault tolerance for such a system: Servers recover from failures and retrieve information needed for safe garbage collection; clients do not recover from failures, yet the scheme is able to reclai... View full abstract»

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  • An efficient parallel join algorithm based on hypercube-partitioning

    Publication Year: 1994, Page(s):50 - 57
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    Many parallel join algorithms have been proposed so far but most of which are developed focused on minimizing the disk I/O and CPU costs. The communication cost, however, is also an important factor that can significantly affect the join processing performance in multiprocessor systems. We propose an efficient parallel join algorithm, called Cube-Robust, for hypercube multicomputers. The proposed ... View full abstract»

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  • PDIS and the Information Highway

    Publication Year: 1994, Page(s):220 - 222
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    Advanced networking technologies offer opportunities for new and better PDIS. The Information Highway attracts a great deal of attention, and yet a precise definition eludes us. There are two trends that are real. The first, and the one that will have the most impact, is the expansion of the Internet and commercial analogues. The other trend is the technological changes in higher performance netwo... View full abstract»

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  • Exposing I/O concurrency with informed prefetching

    Publication Year: 1994, Page(s):7 - 16
    Cited by:  Papers (27)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (808 KB)

    Informed prefetching provides a simple mechanism for I/O-intensive, cache-ineffective applications to efficiently exploit highly-parallel I/O subsystems such as disk arrays. This mechanism, dynamic disclosure of future accesses, yields substantial benefits over sequential readahead mechanisms found in current file systems for non-sequential workloads. This paper reports the performance of the Tran... View full abstract»

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  • Precision and recall of GlOSS estimators for database discovery

    Publication Year: 1994, Page(s):103 - 106
    Cited by:  Papers (6)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    Online information vendors and the Internet together offer thousands of text databases from which a user may choose for a given information need. This paper presents a framework for and analyses a solution to this problem, which we call the text-database discovery problem. Our solution is to build a service that can suggest potentially good databases to search. A user's query goes through two step... View full abstract»

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  • Achieving transaction scaleup on Unix

    Publication Year: 1994, Page(s):249 - 252
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    Constructing scalable high-performance applications on commodity hardware running the Unix operating system is a problem that must be addressed in several application domains. We relate our experience in achieving transaction scaleup on Unix for a high-performance OLTP system intended for Service Control Points (SCPs) in a telephone switching network. SCPs are but one example from a class of appli... View full abstract»

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  • An economic paradigm for query processing and data migration in Mariposa

    Publication Year: 1994, Page(s):58 - 67
    Cited by:  Papers (52)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (920 KB)

    Many new database applications require very large volumes of data. Mariposa is a database system under construction at Berkeley responding to this need. This system combines the best features of traditional distributed database systems, object-oriented DBMSs, tertiary memory file systems and distributed file systems. Mariposa objects can be stored over thousands of autonomous sites and on memory h... View full abstract»

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  • A classification of multi-database languages

    Publication Year: 1994, Page(s):195 - 202
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (668 KB)

    This paper defines a formal classification of multi-database languages into five levels of database integration with increasing degree of global control and decreasing degree of local autonomy. First, the fundamental interoperability mechanisms are identified for each of these levels. Their consequences on local autonomy as well as implementation drawbacks are discussed. Second, various multi-data... View full abstract»

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  • Managing network resources for efficient, reliable information systems

    Publication Year: 1994, Page(s):223 - 226
    Cited by:  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB)

    Recent advances in public network technology and emerging database interface standards enable the implementation of a new type of distributed database systems and create demand for improved query distribution and query optimization algorithms. A research topic that immediately arises is cost minimization for ISDN usage. Even if policies for charging telephone communications may vary, it is a fair ... View full abstract»

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  • Priority assignment in real-time active databases

    Publication Year: 1994, Page(s):176 - 184
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (748 KB)

    Active databases and real-time databases have been important areas of research in the recent past. It has been recognized that many benefits can be gained by integrating active and real-time database technologies. However, there has not been much work done in the area of transaction processing in active real-time databases. This paper deals with an important aspect of transaction processing in act... View full abstract»

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  • Dynamic parity stripe reorganizations for RAID5 disk arrays

    Publication Year: 1994, Page(s):17 - 26
    Cited by:  Papers (6)  |  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (780 KB)

    RAID5 disk arrays provide high performance and high reliability for reasonable cost. However RAIDS suffers a performance penalty during block updates. We examine the feasibility of using “dynamic parity striping” to improve the performance of block updates. Instead of updating each block independently, this method buffers a number of updates, generates a new stripe composed of the newl... View full abstract»

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  • Private locking and distributed cache management

    Publication Year: 1994, Page(s):151 - 159
    Cited by:  Papers (3)  |  Patents (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (844 KB)

    For a data sharing database system, substantial costs are incurred for global locking, to support both transactions and cache management. Replacing global locks with local locks managed by local lock managers offers the opportunity to substantially reduce locking overhead. To do this requires the exploitation of global covering locks. We discuss covering in general, and describe the conflicts requ... View full abstract»

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  • ParSets for parallelizing OODBMS traversals: implementation and performance

    Publication Year: 1994, Page(s):111 - 120
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (736 KB)

    Describes the design and implementation of ParSets, a means of exploiting parallelism in the SHORE persistent object store. We used ParSets to create and parallelize the graph traversals of the OO7 OODBMS benchmark, and present speedup and scaleup results from parallel SHORE running these traversals on a cluster of commodity workstations connected by a standard Ethernet. For some OO7 traversals, S... View full abstract»

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  • A client/server architecture for distributed workflow management systems

    Publication Year: 1994, Page(s):253 - 256
    Cited by:  Papers (8)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    A specific task of distributed and parallel information systems is workflow management, In particular, workflow management system execute business processes that run on top of distributed and parallel information systems. Parallelism is due to performance requirements and involves data and applications that are spread across a heterogeneous, distributed computing environment. Heterogeneity and dis... View full abstract»

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  • The RISAM storage manager for parallel architectures

    Publication Year: 1994, Page(s):69 - 70
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB)

    The use of massively parallel processors for high performance data management is moving rapidly into the commercial mainstream. This paper describes key features of the RISAM (replicated ISAM) parallel data manager, which is currently available on the C-DAC PARAM 8000 series of parallel supercomputers and on the Unisys U6000 symmetric multiprocessors, and which can be readily ported to other platf... View full abstract»

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  • Digital's DB Integrator: a commercial multi-database management system

    Publication Year: 1994, Page(s):267 - 268
    Cited by:  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (120 KB)

    Digital Equipment Corporation's DB Integrator (DBI) is a shipping, fully functional multi-database management system. DB Integrator is targeted at customers who have data stored in multiple data sources, typically heterogeneous and/or non-relational, who want to view those data sources as a single logical database from the data and/or metadata perspective. It provides users executing applications ... View full abstract»

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  • A proposed globally distributed federated database: a practical performance evaluation

    Publication Year: 1994, Page(s):203 - 212
    Cited by:  Papers (1)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (852 KB)

    Many organisations are now planning to move their operations from total reliance on centralised databases towards distributed environments which may involve the interoperability of a number of heterogeneous databases. This study looks at a particular case for an international financial institution, with the likely performance of a proposed globally distributed federated database being compared wit... View full abstract»

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