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检索条件"主题词=object-oriented databases"

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Function materialization in object bases 91

Function materialization in object bases

引用

1991 ACM SIGMOD International Conference on Management of Data, SIGMOD 1991

作者： Kemper, Alfons Kilger, Christoph Moerkotte, Guido Universität Karlsruhe Fakultät für Informatik KarlsruheD-7500 Germany

ISBN: (纸本)0897914252

We describe function materialization as an optimization concept in object-oriented databases. Exploiting the object-oriented paradigm-namely classification, object identity, and encapsulation-facilitates a rather easy incorporation of function materialization into (existing) object-oriented systems. Furthermore, the exploitation of encapsulation (information hiding) and object identity provides for additional performance tuning measures which drastically decrease the rematerialization overhead incurred by updates in the object base. The paper concludes with a quantitative analysis of function materialization based on a sample performance benchmark obtained from our experimental object base system GOM. © 1991 ACM.

关键词： object-oriented databases

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The PRISMA experiment

引用

Workshop on Parallel Database Systems, 1990

作者： Apers, Peter M. G. Hertzberger, L.O. Hulshof, Ben J. A. University of Twente Netherlands University of Amsterdam Netherlands Philips Research Laboratories Netherlands

ISBN: (纸本)9783540541325

The design of a large database management system on top of an object-oriented platform which is implemented on a tightly coupled multiprocessor system requires a large number of design decisions. There exist no methodology to evaluate the consequences and compare the differences between them. Looking into experimental methodology in physics we find a lot of similarities and techniques we think that are useful to solve our problems. A discussion is presented in which way such experiments have to be set up and of the tools that are required. The status of the project and our experience up till now is presented. © Springer-Verlag Berlin Heidelberg 1991.

关键词： object-oriented databases

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object integrity using rules 5th

引用

5th European Conference on object-oriented Programming, ECOOP 1991

作者： Medeiros, Claudia Bauzer Pfeffer, Patrick DCC-IMECC-UNICAMP CP 6065 CampinasSP13081 Brazil Department of Computer Science University of Colorado BoulderCO80309-0430 United States

ISBN: (纸本)9783540542629

Integrity maintenance in object-oriented systems has so far received little attention. This paper is an attempt to fill this gap. It describes a mechanism for maintaining integrity in an object- oriented database, implemented for the O2 system, and which uses the production rule approach to constraint maintenance. object integrity is ensured by objects themselves - the rules which are activated when selected events take place. The approach presented is original, in the sense that it takes full advantage of the object-oriented paradigm, considering constraints as first-class citizens which can be inherited, and defined independently of any application. Furthermore, we support maintenance of not only static but also some types of dynamic constraints, as well as constraints on object behavior. © Springer-Verlag Berlin Heidelberg 1991.

关键词： object-oriented databases

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The expressive power structured values in pure OODB's 91

The expressive power structured values in pure OODB's

引用

10th ACM SIGACT-SIGMOD-SIGART Symposium on Principles of Database Systems, PODS 1991

作者： Van Den Bussche, Jan Paredaens, Jan Dept. Math. and Comp. Science Universiteitsplein 1 AntwerpB-2610 Belgium

ISBN: (纸本)0897914309

We provide a general framework to study the notion of abstraction in pure object-oriented database models with query languages based on object creation. Abstraction is the key operation to express structured values like aggregates and sets in such languages. We use our general framework to investigate the expressive power of abstraction and to obtain a better understanding of particular features of recent work in the field. © 1991 ACM.

关键词： object-oriented databases

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Behavior analysis of object-oriented databases: Method structure, execution trees, and reachability 3rd

引用

3rd International Conference on Foundations of Data Organization and Algorithms, FODO 1989

作者： Hull, Richard Tanaka, Katsumi Yoshikawa, Masatoshi Computer Science Department University of Southern California Los AngelesCA90089-0782 United States Department of Instrumentation Engineering Faculty of Engineering Kobe University Rokkodai Nada Kobe657 Japan Institute of Computer Sciences Kyoto Sangyo University Kamigamo Kita-ku Kyoto603 Japan

A theoretical model for analyzing the behavior of method execution in object-oriented databases (OODBs) is introduced and used to study issues of reachability, nontermination, and well-typedness in the context of rest... 详细信息

ISBN: (纸本)9783540512950

关键词： object-oriented databases

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Evaluation and optimization of complex object selections 2nd

引用

2nd International Conference on Deductive and object-oriented databases, DOOD 1991

作者： Van den Bussche, Jan Dept. Math. & Comp. Science Universiteitsplein 1 AntwerpB-2610 Belgium

ISBN: (纸本)9783540550150

We provide a general framework for declarative selection operations for complex object databases, based on the safe calculus for complex objects. Within this framework, we consider a class of "single pass-evaluable" selection operations. We show how such selection operations can be succinctly expressed by programs that use only very simple positive existential selections. Also, a syntactic criterion is developed for the commutation of two such positive existential selections. These two results are then jointly applied to the problem of optimizing complex object selections, which is much more complicated than in classical relational databases. © Springer-Verlag Berlin Heidelberg 1991.

关键词： object-oriented databases

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A design and modeling environment to develop real-time, distributed software systems 3rd

引用

3rd International Conference on Computing and Information, ICCI 1991

作者： Ammar, Reda Zhang, Ping U155 Computer Science & Engineering Department University of Connecticut StorrsCT06268 United States

ISBN: (纸本)9783540540298

This paper presents the general structure of a design and modeling environment for real-time, parallel/distributed software systems. It is provided for the designer to cope with different modeling and analysis methods during the different design stages. It captures three trends of concerns in the design of a real-time, distributed system: functionality, performance and distributed aspects. An object-oriented database and a plan generator are two core components. The database is used to organize data so that they can be easily retrieved and easily reused for further study, reference and reporting. More significantly, it is used to integrate the dependencies and relationships between different modeling techniques and performance evaluation tools. The plan generator has a role of analyzing plan development, recommending plan modifications, suggesting plan modeling, and validating plans. It provides the ability to handle incomplete and uncertainty information, the ability to handle update propagation, and the ability to make more intelligent design decision. © Springer-Verlag Berlin Heidelberg 1991.

关键词： object-oriented databases

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A model of concurrent, cooperating transactions in an object-oriented database

A model of concurrent, cooperating transactions in an object...

引用

MIT-JSME Workshop on Computer-Aided Cooperative Product Development, 1989

作者： Skarra, Andrea H. Brown University Department of Computer Science ProvidenceRI02192 United States

ISBN: (纸本)9783540540083

We describe a model of transactions and concurrency control that supports cooperative task and data sharing among users. The model augments traditional correctness criteria, such as global consistency for individual transactions and serializabitity for concurrent transactions, with programmer-defined correctness criteria that uniformly integrate both data and application semantics. Individual transactions are not required to maintain global consistency. Rather, transactions cooperate in groups, such that transaction groups are the units of consistency. The context for the model is an extensible object-oriented database: abstract data types define the behavior and representation of their instance objects, and each object is accessed only by way of the strict operational interface defined by its type. Applications can incrementally contribute new types to the database. The model effectively represents a transaction management system that is programmable by knowledgeable application designers. Although developed toward the needs of applications that provide computer support for cooperative activities, such as office information systems, graphical programming environments, and CAD tools for electronic or mechanical domains, the model provides a framework for any application for which the traditional transaction model is too restrictive. The model’s key features are a nested framework of transaction groups that encapsulate nonserializabie data sharing and a method for localized specification of semantic correctness criteria for concurrent histories of cooperating transactions. © Springer-Verlag Berlin Heidelberg 1991.

关键词： object-oriented databases

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An approach to deriving object hierarchies from database schema and contents 6th

An approach to deriving object hierarchies from database sch...

引用

6th International Symposium on Methodologies for Intelligent Systems, ISMIS 1991

作者： Chen, I-Min Amy Lee, Rei-Chi Intelligence Ware Inc. 5933 W. Century Blvd. Los AngelesCA United States

ISBN: (纸本)9783540545637

Database design involves a set of activities, which include requirements analysis, conceptual database design, selection of a database management system, mapping from conceptual model to physical model, and the physical database design. Two problems that often confuse database designers in the conceptual database design phase are: (1) how to construct object hierarchies, and (2) how to specify object hierarchies. In this paper, we propose an adaptive approach utilizing a schema evolution process to address these two problems. The approach provides a set of heuristics to analyze the database schema as well as the database contents to provide substantial information to database designers for constructing and specifying object hierarchies. © Springer-Verlag Berlin Heidelberg 1991.

关键词： object-oriented databases

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A comparison between deductive and object-oriented database systems 2nd

引用

2nd International Conference on Deductive and object-oriented databases, DOOD 1991

作者： Ullman, Jeffrey D. Stanford University United States

ISBN: (纸本)9783540550150

The author will not pretend to be unbiased in the matter of comparing the deductive and object-oriented approaches to new database systems;he believes that despite some important concepts originating with the object-oriented approach, the deductive family of systems will ultimately dominate. We shall explore some of the reasons why the two approaches do not mix well. Fortunately, most of the features of object-oriented database systems can be incorporated in deductive systems (but not vice-versa). Then we argue that declarativeness is important for at least some of the new applications, and that declarative languages cannot be object-oriented in a nontrivial way. We next contrast the approaches with regard to the way they classify data elements. We close with an examination of the prospects for "classless" data, which is motivated by the prospect of databases where the number of distinct classes would be too large to name systematically. There are a number of challenges to implementing such facilities in either paradigm, and we propose some appropriate research questions. © Springer-Verlag Berlin Heidelberg 1991.

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