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object-oriented DATABASE-SYSTEMS - CONCEPTS AND PERSPECTIVES

INTERNATIONAL SYMP ON DATABASE SYSTEMS OF THE 90S

作者： UNLAND, R SCHLAGETER, G University of Hagen Department of Computer Science P.O. Box 940 Hagen 1 D-5800 Germany

ISBN: (纸本)3540533974

During the last years object-oriented database systems have become a major topic in database research. A large number of research institutes are working on individual aspects or complete system prototypes. However, there is still much confusion about which features make up such a system. This paper attempts to define the main features and characteristics. It distinguishes between a basic definition and an extended definition. The latter tries to cover some more extensive requirements for object-oriented database systems as they are introduced by non-standard applications. Moreover, the paper attempts to identify the most important variants by which a feature may be realized and shows some open fields for research work. © Springer-Verlag Berlin Heidelberg 1990.

关键词： object-oriented databases

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Type consistency of queries in an object-oriented database system 90

Type consistency of queries in an object-oriented database s...

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1990 European Conference on object-oriented Programming on object-oriented Programming Systems, Languages, and Applications, OOPSLA/ECOOP 1990

作者： Straube, Dave D. Tamer Özsu, M. Laboratory for Database Systems Research Department of Computing Science University of Alberta EdmontonABT6G 2H1 Canada Banyan Systems Inc. 115 Flanders Road WestboroMA01581 United States

ISBN: (纸本)0897914112

Queries in object-oriented databases can return non-homogeneous sets of objects when no type restrictions are placed on the inputs to the query. The tradition has been to force homogeneity on the result by restricting the types of the inputs. This restricts the range of permissible, and possibly useful, queries. We propose a type consistency theory for queries in object-oriented databases which supports the existence of multiple types in the query result. The technique is illustrated by developing type inference rules for an object algebra. The main result is that the loss of type information associated with a query operation is reduced in most cases. We also show how type information is increased when queries are qualified by conjunctive predicates. © 1990 ACM.

关键词： object-oriented databases

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An evaluation model for clustering strategies in the 02 object-oriented database system 3rd

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3rd International Conference on Database Theory, ICDT 1990

作者： Benzaken, Veronique Altaïr BP105 Le Chesnay Cedex78153 France

ISBN: (纸本)9783540535072

This paper adresses the problem of clustering complex data on disk to minimize the number of I/O in data intensive applications. It describes the clustering strategies adopted in the O2 system. As clustering depends on both structural aspects (composition hierarchy of the classes) and dynamic aspects (the methods associated with the classes) the paper details a cost model in order to evaluate the benefits of the clustering strategies. This model will permit to automatically derive new clustering strategies. To this end, a derivation algorithm which builds an optimal strategy in linear time is presented. © Springer-Verlag Berlin Heidelberg 1990.

关键词： object-oriented databases

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A query service for a software engineering database system 4

A query service for a software engineering database system

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4th ACM SIGSOFT Symposium on Software Development Environments, SDE 1990

作者： Tedjini, Mohamed Thomas, Ian Benoliel, Guy Minot, Régis G.J.E. EMERAUDE BULL SA 68 Route de Versailles LouveciennesF-78430 France Intecs Via Fratti 14 Pisa56100 Italy Hewlett-Packard Software Engineering Systems Division 1266 Kifer Road SunnyvaleCA94086 United States

ISBN: (纸本)089791418X

The PCTE interfaces define a Public Tool Interface intended to serve as a basis for the construction of integrated software engineering environments (SEES). The interfaces include object Management System (OMS) services that manage the data repository of the environment. The OMS is based on a binary Entity-Relationship model. This paper describes a query service constructed on the PCTE interfaces. Following a brief summary of the OMS features that are necessary to understand the paper, we describe the requirements and design objectives for a query service in an integrated SEE, the basic model for our solution, and then review the facilities of the service. The paper also contains a comparison with other work on queries on E-R and object-oriented databases. The paper's conclusions indicate the differences that exist between requirements and characteristics for query services on SEE data repositories and those for other databases. It shows, for example, how assumptions about data availability and accessibility that are often made for query services are not appropriate for SEE data repositories. © 1990 ACM.

关键词： object-oriented databases

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Automatic theorem proving in paraconsistent logics: Theory and implementation 10th

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10th International Conference on Automated Deduction, CADE 1990

作者： Da Costa, Newton C. A. Henschen, Lawrence J. Lu, James J. Subrahmanian, V.S. University of Sao Paulo Brazil Northwestern University EvanstonIL United States University of Maryland College ParkMD United States

ISBN: (纸本)9783540528852

databases and knowledge bases may be inconsistent in many ways. However, a database that is inconsistent may, nonetheless, contain a great deal of useful information. Classical logic, however, would deem such a database as useless. Paraconsistent logics are a family of logics introduced by da Costa. A family of paraconsistent logics called annotated logics were proposed by Subrahmanian in [17]. Subsequently, these logics found use in reasoning about logic programs that contained inconsistent and/or erroneous information, as well as in the study of inheritance hierarchies and object oriented databases. However, no full-fledged study of automatic theorem proving in these logics has been carried out to date. In this paper, we develop a linear resolution style proof procedure for mechanical reasoning in these paraconsistent logics. © Springer-Veflag Berlin Heidelberg 1990.

关键词： object-oriented databases

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Model instantiation for query driven simulation in active KDL 23

Model instantiation for query driven simulation in active KD...

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23rd Annual Symposium on Simulation, ANSS 1990

作者： Miller, John A. Potter, Walter D. Kochut, Krys I. Weyrich, Orville R. Department of Computer Science United States Artificial Intelligence Program University of Georgia AthensGA30602 United States

ISBN: (纸本)0818620676

The focus of this paper is on how Active KDL can be used to provide a very powerful simulation support environment. Active KDL (Knowledge/Data Language) is an object-oriented database programming language, which provides access to integrated model, knowledge, and data bases. Simulation inputs and outputs can be stored by Active KDL since it supports complex objects. More importantly, Active KDL also allows users to specify rules to capture heuristic knowledge and methods to specify procedural behavior. Finally, Active KDL provides a simple mechanism for specifying concurrent execution, namely tasks embedded in active objects. These facilities provide a powerful mechanism for building simulation models out of pre-existing model components. These capabilities provide a tight coupling between a SIMODULA-like simulation system and a knowledge/database system, supporting query driven simulation, where model instantiation is used for information generation. © 1990 Association for Computing Machinery Inc. All rights reserved.

关键词： object-oriented databases

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object oriented database using frames in second generation APL 90

Object oriented database using frames in second generation A...

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International Conference on the APL Programing Language, APL 1990

作者： Pantziarka, Panagiotis Control Systems Research Centre Dept. Electrical and Electronic Engineering South Bank Polytechnic Borough Rd. LondonSE1 0AA United Kingdom

ISBN: (纸本)089791371X

The appeal of object oriented systems and methodologies is that they provide conceptually simple and powerful tools to represent the real-world. The essential elements of object orientation include: information hiding, classes, dynamic instantiation of objects, methods and the inheritance of properties by objects. Frames are a way to combine both data and procedures to represent knowledge. This paper describes a frame representation system that is used to create a simple object oriented database. The frame structures are described and it is shown that they can be represented as nested arrays. The inheritance mechanisms are detailed and functions developed to handle the frames. Finally a proposal is made for the further development of frame structured systems in APL. © 1990 ACM.

关键词： object-oriented databases

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A database interface for phased tool integration

A database interface for phased tool integration

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1990 European Design Automation Conference, EDAC 1990

作者： Kathofer, T. Fox, W. Nolte, D. Pielsticker, K. Quester, R. Rupprecht, F. Schrewe, M. Joint Venture of Nixdorf Computer AG University of Paderborn Bahnhofstrafie 32 PaderbornD-4790 Germany

ISBN: (纸本)0818620242

The use of an object-oriented database is required to successfully accomplish the phased integration of diverse design tools and data used during the CAD process. The paper discusses the requirements for such a database and presents an interface which satisfies these requirements. Furthermore, it shows how the Cadlab implementation of this interface was used in the realization of the Cadlab workstation design environment. © 1990 IEEE.

关键词： object-oriented databases

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The impact of hardware on database systems

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International Symposium on Database Systems of the 90s, 1990

作者： Selinger, Patricia G. IBM Almaden Research Center 650 Harry Road San JoseCA95120 United States

ISBN: (纸本)9783540533979

Relational database management systems translate queries posed in a non-procedural language into an efficiently executable plan. The plan consists of primitive database operators that use underlying database management system facilities or exploit the capabilities of the underlying operating system and hardware platform. The high level of the user’s queries provides a substantial opportunity for hardware to increase the response time or throughput capacity of the DBMS. Such speedup can be derived from special devices for specific functions, such as sorting, or from entireiy new architectures that apply more MIPS to the same data, such as database machines. Besides these opportunities, relational databases can utilize hardware support in providing new capabilities for their end users. Examples include the use of fiber optics for fast communication in distributed database management, or vector processing facilities attached to general purpose processors for supporting additional datatypes and operations for engineering. There is another type of hardware impact on databases. This is the area of input/output (I/O), where specialized hardware provides either the source or target of the database data and operations. In this category are disk arrays, used for high bandwidth data storage and retrieval, or highly parallel data access. Less frequently mentioned are sensor-based input or realtime control output (e.g. robots). In this paper, we will discuss all three categories of hardware support: hardware that speeds up response time or throughput, hardware that enables the database to offer new functions efficiently, and I/O hardware that affects the kind of functions a database can offer. Throughout this discussion, we will restrict our focus to relational databases, but of course the discussion pertains to some areas of hierarchical, network, and object oriented databases as well. © Springer-Verlag Berlin Heidelberg 1990.

关键词： object-oriented databases

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The Cognitive Consequences of object-oriented Design

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Human-Computer Interaction 1990年第4期5卷 345-345页

作者： Rosson, Mary Beth Alpert, Sherman R

Examines the usability of the object-oriented programming and design in cognitive consequences. Characteristics of the object-oriented design; Structure of the problem decomposition; Influence of solution content on t... 详细信息

关键词： object-oriented databases COGNITION

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