Experiences of both researchers and practitioners with the development of object-oriented database systems help us to evaluate the real contributions of object-oriented modeling principles and show the limits and poss...
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This paper describes a new approach for supporting reactive capability in an advanced object-oriented database system called ADOME-I1. Besides having a rich set of pre-defined composite event expressions and a well-de...
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To improve performance of object-oriented database processing, integration between parallel and objectoriented technologies is sought. In this paper, we concentrate on path expression queries. Parallelization of path ...
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The present development in the database area is highly influenced by the object-oriented principles of data modeling. On the contrary to the previously successful relational approach, it lacks rigorous theoretical sup...
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This paper describes the architecture and several key aspects of FIODBS, an interoperable object-database system developed by Fudan University,P.R. ***, it presents a common object model, which provides basic OO featu...
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We present an elegant technique to reduce inheritance and encapsulation to pure deduction. The reduction technique presented in this paper makes it possible to model object-oriented database features in a purely deduc...
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ISBN:
(纸本)1558604707
We present an elegant technique to reduce inheritance and encapsulation to pure deduction. The reduction technique presented in this paper makes it possible to model object-oriented database features in a purely deductive system. Encapsulation has been given a formal treatment for the first time by introducing the so called context-resolution scheme. The completion technique presented in this paper elegantly tackles inheritance with overriding and conflict resolution by avoiding non-monotonic reasoning. We show that the completion based reduction technique is robust and appealing compared to any other known rewriting based approaches. We propose an object-oriented front-end language called the Datalog++, and discuss a rewriting scheme to the acclaimed Datalogneg for this language that exploits the con text resolution and completion techniques presented here. We claim that our approach outperforms other known approaches in the literature in terms of its modeling capabilities and efficiency. Unlike mast others, an implementation based on our reduction technique does not require meta-Lnterprctation and consequently readily exploits the rich set of optimization techniques available in Datalogneg.
Derivations in object-oriented databases are supported currently by means of imperative methods or by using deductive or even active rules. As imperative languages are difficult to analyze in order to extract dependen...
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We introduce partly-consistent cuts, a mechanism analogous to causal cuts, defined in the context of object-oriented databases. A partly-consistent cut is a collection containing one or more copies of every page in a ...
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ISBN:
(纸本)9783540634409
We introduce partly-consistent cuts, a mechanism analogous to causal cuts, defined in the context of object-oriented databases. A partly-consistent cut is a collection containing one or more copies of every page in a given database;the copies are made during the operation of the database, at different times. We consider four classes of partly-consistent cuts. Each class implies a different set of constraints imposed on the times when the copies are made. The consistency properties (i.e. the ability to correctly represent what happens in the actual execution of the database) of the cuts in each class are analyzed. One class, called GC-consistent cuts, can be used by a concurrent garbage collector to determine which objects to delete.
Indexing schemes for traditional object-oriented databases (OODBs) are divided into two catalogues: class hierarchy indexing and nested indexing. Since most of these systems are static in nature, dynamic operations li...
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The Dynamic Brain Project will create an interactive database on the human brain, available via the Internet. In addition to medical images and textual information, the completed project will give users access to all ...
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