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
  • The evolution of customer middleware requirements

    Publication Year: 1994, Page(s):262 - 263
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (81 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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  • Digital's DB Integrator: a commercial multi-database management system

    Publication Year: 1994, Page(s):267 - 268
    Cited by:  Patents (5)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (139 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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  • InterViso: a data integration server

    Publication Year: 1994, Page(s):265 - 266
    Cited by:  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (150 KB)

    Connectivity products are available to connect computers containing data. DBMS vendors are providing gateways into their products, and SQL is being retrofitted on many older DBMSs to make it easier to access data from standard 4GL products and application development systems. The next step needed for integration of data is to provide a common data dictionary with a conceptual schema across the dat... View full abstract»

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  • DataJoiner: a practical approach to multi-database access

    Publication Year: 1994
    Cited by:  Papers (1)  |  Patents (5)
    Request permission for 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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  • Performance evaluation of the Remote Cooperation System in PRIMA

    Publication Year: 1994, Page(s):257 - 260
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (414 KB)

    In order to achieve acceptable performance in enhanced DBMS, different kinds of parallelism have to be enabled by appropriate implementation capabilities. The Remote Cooperation System (RCS) offers these capabilities. It is the basic communication system of an enhanced DBMS called PRIMA. We present different implementations for RCS and an analysis of their performance behavior. In order to get a b... 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 (10)  |  Patents (4)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (388 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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  • Achieving transaction scaleup on Unix

    Publication Year: 1994, Page(s):249 - 252
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (392 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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  • Fault-tolerant distributed garbage collection in a client-server object-oriented database

    Publication Year: 1994, Page(s):239 - 248
    Cited by:  Papers (7)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (907 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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  • A predicate-based caching scheme for client-server database architectures

    Publication Year: 1994, Page(s):229 - 238
    Cited by:  Papers (3)  |  Patents (11)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1022 KB)

    We propose a new client-side data caching scheme for relational databases with a central server and multiple clients. Data is loaded into a client cache based on queries, which are used to form predicates describing the cache contents. A subsequent query at the client may be satisfied in its local cache if we can determine that the query result is entirely contained in the cache. This issue is cal... 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 reuse | Click to expandAbstract | PDF file iconPDF (235 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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  • PDIS and the Information Highway

    Publication Year: 1994, Page(s):220 - 222
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (255 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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  • Interdatabase existence dependencies: a metaclass approach

    Publication Year: 1994, Page(s):213 - 216
    Cited by:  Papers (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (402 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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  • A proposed globally distributed federated database: a practical performance evaluation

    Publication Year: 1994, Page(s):203 - 212
    Cited by:  Papers (2)  |  Patents (5)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (980 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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  • A classification of multi-database languages

    Publication Year: 1994, Page(s):195 - 202
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (773 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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  • Framework for object migration in federated database systems

    Publication Year: 1994, Page(s):187 - 194
    Cited by:  Papers (5)  |  Patents (17)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (681 KB)

    Existing federated database systems (FDBS) provide uniform access to multiple heterogeneous DBS, but do not enable objects to move across the DBS while retaining global identity. To fulfil this requirement of industrial users, we provide a framework incorporating a flexible object migration mechanism into FDBS. It offers different capabilities for "what" and "how" to migrate: (1) different kinds o... View full abstract»

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  • Priority assignment in real-time active databases

    Publication Year: 1994, Page(s):176 - 184
    Cited by:  Papers (10)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (881 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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  • A fractional data allocation method for distributed databases

    Publication Year: 1994, Page(s):168 - 175
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (915 KB)

    High performance transaction processing in a distributed database (DDB) system can only be achieved through a high degree of locality of access, which may be attainable by appropriate data allocation. In this paper, we discuss an adaptive data allocation method for DDB systems maintaining resource allocation data, as in airline reservations and inventory control applications. According to the frac... View full abstract»

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  • Timestamping after commit

    Publication Year: 1994, Page(s):160 - 167
    Cited by:  Papers (7)  |  Patents (10)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (859 KB)

    Many applications need transaction-consistent pictures of past states of the database. These applications use the commit time of the transaction to timestamp the data. When a transaction is distributed, the cohorts must vote on a commit time and the coordinator must choose a commit time based on the votes of the cohorts. This implies that timestamps are applied after commit. Until the timestamps a... 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 reuse | Click to expandAbstract | PDF file iconPDF (976 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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  • Session guarantees for weakly consistent replicated data

    Publication Year: 1994, Page(s):140 - 149
    Cited by:  Papers (116)  |  Patents (6)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1063 KB)

    Four per-session guarantees are proposed to aid users and applications of weakly consistent replicated data: "read your writes", "monotonic reads", "writes follow reads", and "monotonic writes". The intent is to present individual applications with a view of the database that is consistent with their own actions, even if they read and write from various, potentially inconsistent servers. The guara... View full abstract»

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  • Divergence caching in client-server architectures

    Publication Year: 1994, Page(s):131 - 139
    Cited by:  Papers (13)  |  Patents (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (897 KB)

    Proposes a new mechanism, divergence caching, for reducing access and communication charges in accessing online database servers. The objective is achieved by allowing tolerant read requests, namely requests that can be satisfied by out-of-date data. We propose two algorithms based on divergence caching-static and dynamic. The first is appropriate when the access pattern to an object in the databa... View full abstract»

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  • Query processing for decision support: the SQLmpp solution

    Publication Year: 1994, Page(s):121 - 130
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (978 KB)

    Decision support systems are characterized by large data sets and complex queries with multi-way joins, aggregation and nesting. SQLmpp is a highly parallel database server designed to efficiently support these applications. SQLmpp's query processing strategy is driven by three principal goals: (1) data parallelism in all operations, (2) maximal use of any relevant indexes, and (3) minimal process... 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 (5)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (849 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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  • Precision and recall of GlOSS estimators for database discovery

    Publication Year: 1994, Page(s):103 - 106
    Cited by:  Papers (10)  |  Patents (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (357 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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  • Secure access to data over the Internet

    Publication Year: 1994, Page(s):99 - 102
    Cited by:  Papers (6)  |  Patents (28)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (386 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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