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An object-oriented database model for a change management framework in workgroup computing systems

INFORMATION AND SOFTWARE TECHNOLOGY 1998年第2期40卷 79-92页

作者： Huh, SY Korea Adv Inst Sci & Technol Grad Sch Management Dongdaemoon Ku Seoul 130012 South Korea

Workgroup computing systems are emerging to support a group of users engaged in common tasks such as group decision making, engineering design, group scheduling, or collaborative writing. Since shared objects in the workgroup systems are constantly evolving, providing the users with synchronized and consistent views of the objects is important for achieving improved team productivity. This paper proposes an object-oriented model for a change management framework supporting workgroup systems to facilitate managing dependency relationships between shared objects and dependent user views and to coordinate change and propagation activities between the two in client-server computing environments. In developing the framework, this study firstly singles out the requirements of change management in workgroup systems and conceptualizes the change management mechanisms with transient shared objects. It secondly extends the mechanisms into a persistent transactional database computing and client-server computing environment. In so doing, it specifically employs an object-oriented database paradigm to seamlessly capture transient and persistent transactional objects in a single formalism and presents a set of well-modularized abstract object constructs facilitating dependency management and change notification mechanisms for workgroup computing systems. The proposed framework is developed on the basis of a commercial object-oriented database Management System (ODBMS) called objectSTORE using the C++ programming language. (C) 1998 Elsevier Science B.V.

关键词： object-oriented database management framework computing systems

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ON LOCKING PROTOCOLS IN object-oriented database-SYSTEMS

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IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS 1995年第11期E78D卷 1449-1457页

作者： TANIGUCHI, S NISHIO, S Shiga Univ Hikone-shi Japan

As object-oriented database Systems (OODBS) play an increasingly important role in advanced database systems, OODBS performance becomes a significant issue. It is well known that there is a strong relationship between performance and the concurrency control algorithms employed by the database Management System (DBMS). Class Granularity Locking (CGL) and Class Hierarchy Granularity Locking (CHGL) are proposed as the concurrency control algorithms for OODBS to minimize the locking overhead. However, their basic characteristics, including the locking overhead and concurrency, have not been extensively investigated and it is not known which one is most appropriate for the general case. In this paper, we construct a simulation model for OODBS and carry out several performance evaluation studies on these two Class-Hierarchy Locking protocols and the Non Class-Hierarchy Locking (NCL) protocol. The NCL protocol is a variation of the conventional two phase locking protocol being applied to OODBS data structures.

关键词： object-oriented database CONCURRENCY CONTROL PERFORMANCE EVALUATION SIMULATION

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MULTIPARADIGM QUERY INTERFACE TO AN object-oriented database

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INTERACTING WITH COMPUTERS 1995年第1期7卷 25-47页

作者： DOAN, DK PATON, NW KILGOUR, AC ALQAIMARI, G Department of Computing and Electrical Engineering Heriot-Watt University Riccarton Edinburgh EH14 4AS Scotland UK

The object-oriented paradigm has a number of widely recognised strengths when applied to data management, but the increased complexity of actual systems compared with their relational predecessors often means that such databases are less readily accessible to non-programmers than relational systems. A number of proposals have been made for textual, form-based and graph-based query interfaces to object-oriented databases, but it is clear that a single approach cannot be considered to be the best, given the wide range of potential user groups, application domains and tasks. The paper presents a query interface to an object-oriented database which supports alternative user-level query paradigms in a fully integrated environment, thereby enabling different categories of user to select a preferred interface paradigm from a list of options. Furthermore, the interface enables users to examine queries written in one query interface using any of the other interface paradigms, which is useful for sharing queries in the multi-paradigm context, and for helping users familiar with one approach to learn another. The system has been prototyped using the ADAM object-oriented database system, and an experimental comparison of different interaction modes has been conducted.

关键词： HUMAN-COMPUTER INTERACTION object-oriented database QUERY INTERFACE

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Frameworks for incorporating semantic relationships into object-oriented database systems

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CONCURRENCY AND COMPUTATION-PRACTICE & EXPERIENCE 2003年第15期15卷 1337-1362页

作者： Halper, M Liu, LM Geller, J Perl, Y Kean Univ Dept Math & Comp Sci Union NJ 07083 USA Chung Yuan Christian Univ Dept Appl Math Chungli Taiwan New Jersey Inst Technol Dept Comp Sci Newark NJ 07102 USA

A semantic relationship is a data modeling construct that connects a pair of classes or categories and has inherent constraints and other functionalities that precisely reflect the characteristics of the specific relationship in an application domain. Examples of semantic relationships include part-whole, ownership, materialization and role-of. Such relationships are important in the construction of information models for advanced applications, whether one is employing traditional data-modeling techniques, knowledge-representation languages or object-oriented modeling methodologies. This paper focuses on the issue of providing built-in support for such constructs in the context of object-oriented database (OODB) systems. Most of the popular object-oriented modeling approaches include some semantic relationships in their repertoire of data-modeling primitives. However, commercial OODB systems, which are frequently used as implementation vehicles, tend not to do the same. We will present two frameworks by which a semantic relationship can be incorporated into an existing OODB system. The first only requires that the OODB system support manifest type with respect to its instances. The second assumes that the OODB system has a special kind of metaclass facility. The two frameworks are compared and contrasted. In order to ground our work in existing systems, we show the addition of a part-whole semantic relationship both to the ONTOS DB/Explorer OODB system and the VODAK Model Language. Copyright (C) 2003 John Wiley Sons, Ltd.

关键词： semantic relationship object-oriented database object-oriented modeling part-whole relationship metaclass

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An index allocation tool for object-oriented database systems

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SOFTWARE-PRACTICE & EXPERIENCE 2000年第9期30卷 973-1002页

作者： Bertino, E Catania, B Filippone, A Univ Genoa Dipartimento Informat & Sci Informaz I-16146 Genoa Italy Univ Milan Dipartimento Sci Informaz I-20135 Milan Italy Andersen Consulting Content Technol I-20135 Milan Italy

The problem of index configuration is an important topic for database system performance and has been extensively investigated for relational database Management Systems (DBMS). By contrast, the problem of index allocation for object-oriented DBMS (OODBMS) has been considered only from a theoretical point of view and no practical development of any tool for commercial OODBMS has been reported. In this paper, we investigate the problem of index configuration in the framework of a commercially available OODBMS, We first identify the features that characterize such OODBMS and we develop two cost models: the first extends the generic cost model presented by Gardarin ed al. (Proceedings of the 22nd International Conference on Very Large Data Bases, 1996;378-389), the second is an analytical cost model tailored to the OODBMS at hand, Both cost models have been validated by comparing the estimated costs and the actual costs observed from the system. The comparison has shown that both models are quite accurate. Using the proposed cost models, we have also developed an algorithm for the efficient index allocation on a given path, given a workload specified in terms of operation frequencies, Even though our algorithm has been developed for a specific OODBMS, we believe that it can be easily tailored to other OODBMS and persistent programming languages. Copyright (C) 2000 John Wiley & Sons, Ltd.

关键词： object-oriented database nested attribute indexing technique cost model index configuration

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Reverse simulation for collaborative commerce: A study of integrating object-oriented database technology with object-oriented simulator

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INTERNATIONAL JOURNAL OF FLEXIBLE MANUFACTURING SYSTEMS 2005年第3期17卷 227-250页

作者： Du, Timon C. Li, Eldon Y. Rau, Hsin Lian, Guan-Yuan Chinese Univ Hong Kong Dept Decis Sci & Managerial Econ Hong Kong Hong Kong Peoples R China Natl Chengchi Univ Dept Management Informat Syst Taipei 11605 Taiwan

Collaborative commerce has been used for communication, design, planning, information sharing, and information discovery in business-to-business (B2B) applications. The collaboration between buyers and sellers enhances product quality and customer satisfaction. However, most effort currently focuses on information sharing with customers and suppliers instead of joint product development or manufacturing. Moreover, traditional analytical methods have limited capability in solving problems. This study presents a framework for doing reverse simulation, where designers can reuse past experiments and change system parameters in manufacturing system for collaborative commerce. The framework integrates the object-oriented simulator and the object-oriented database. In this framework, the object-oriented database records the whole experiment scenarios and allows multiple planners with different expertise to involve concurrently and collaboratively. Then, simulations of advanced planning and scheduling in a product manufacturing environment that involves several planners working collaboratively are used for demonstration.

关键词： collaborative commerce reverse simulation object-oriented database

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An effective class hierarchy concurrency control technique in object-oriented database systems

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INFORMATION AND SOFTWARE TECHNOLOGY 1998年第1期40卷 45-53页

作者： Jun, W Gruenwald, L Univ Oklahoma Sch Comp Sci Norman OK 73019 USA

In the paper, we present a locking-based concurrency control scheme for object-oriented databases (OODBs). Our Scheme deals with class hierarchy which is an important property in OODBs. The existing concurrence controls for a class hierarchy perform well only for specific environments. Our scheme is based on so-called special classes and can be used for any applications with less locking overhead than existing works, for both single inheritance and multiple inheritance. In this study, we show the superiority of our scheme over existing works. (C) 1998 Elsevier Science B.V.

关键词： concurrency control class hierarchy object-oriented database

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A probabilistic object-oriented database model with fuzzy probability measures and its algebraic operations

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JOURNAL OF INTELLIGENT & FUZZY SYSTEMS 2015年第5期28卷 1969-1984页

作者： Yan, Li Ma, Zongmin Nanjing Univ Aeronaut & Astronaut Coll Comp Sci & Technol Nanjing Jiangsu Peoples R China

This paper concentrates on modeling probabilistic events with fuzzy probability measures in the object-oriented databases. Instead of crisp probability measures or interval probability measures of objects and classes, fuzzy sets are used to represent imprecise probability measures. A probabilistic object-oriented database model with fuzzy probability measures is introduced, which incorporates fuzzy probability degrees to handle imprecision and uncertainty. Based on the proposed probabilistic object-oriented database model, several major semantic relationships of probabilistic objects and probabilistic classes with fuzzy probability measures are investigated in the paper. Finally we define some algebraic operations for probabilistic objects and probabilistic classes with fuzzy probability measures.

关键词： Probabilistic data model object-oriented database fuzzy sets fuzzy probability measures algebraic operations

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An efficient inductive learning method for object-oriented database using attribute entropy

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IEEE TRANSACTIONS ON KNOWLEDGE AND DATA ENGINEERING 1996年第6期8卷 946-951页

作者： Huang, YM Lin, SH Department of Engineering Science National Cheng Kung University Tainan Taiwan

The data-driven characteristic of Version Space works efficiently in memory even if the training set is enormous. However, the concept hierarchy of each attribute used to generalize/specialize the hypothesis of S/G-set is processed sequentially and instance-by-instance, which degrades its performance. As for ID3, the decision tree is generated from the order of attributes according to their entropies to reduce the number of attributes in some of the tree paths. Unlike Version Space, ID3 generates an extremely complex decision tree when the training set is enormous. Therefore, we propose a method, AGE, taking advantages of Version Space and ID3 to learn rules from object-oriented databases (OODB) with the least number of learning features according to the entropy. By simulations, we found the performance of our learning algorithm is better than both Version Space and ID3. Furthermore, AGE's time complexity and space complexity are both linear to the number of training instances.

关键词： inductive learning Version Space ID3 entropy object-oriented database

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MOODD, A METHOD FOR object-oriented database DESIGN

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DATA & KNOWLEDGE ENGINEERING 1995年第2期17卷 159-181页

作者： SILVA, MJV CARLSON, CR IIT ARMOUR COLL ENGN & SCIDEPT COMP SCICHICAGOIL 60616

In this paper we propose a Method for object-oriented database Design, called MOODD. Considerable recent research [22] has focused on object-oriented design techniques. MOODD distinguishes itself by generating an object-oriented data definition from requirements written in a natural language. Examples to illustrate the method are given for a particular OODBS called 02 [19]. MOODD consists of three phases. The first phase is to use a Requirement Specification Language (RSL) [27] to represent user requirements. Next, the RSL requirements are converted into an object-oriented conceptual model composed of the Nested Entity-Relationship (NER) [10]/Update Protocol Model (UPM) [9]. Finally, the NER/UPM schemas are implemented by an object-oriented data model.

关键词： object-oriented database CONCEPTUAL database DESIGN ENTITY-RELATIONSHIP NATURAL LANGUAGE REQUIREMENT SPECIFICATION LANGUAGE

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