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Semantic multigranularity locking and its performance in object-oriented database systems

JOURNAL OF systems ARCHITECTURE 1998年第12期44卷 917-935页

作者： Kion, KI Moon, S Korea Adv Inst Sci & Technol Grad Sch Management Seoul 130012 South Korea

Concurrency control schemes for object-oriented database systems (OODBSs) used in the area of performance-critical applications should increase the degree of concurrency and decrease locking overhead in order to offer maximum performance. However, most commercially available OODBSs use conventional concurrency control schemes that never exploit the rich semantics of object-oriented data model, thus fail to offer better performance. In this paper, we propose a concurrency control scheme for OODBSs, called in-place semantic multigranularity locking (ISMGL), that not only exploits semantics regarding methods to enhance the concurrency degree, but also utilizes multigranularity locking rules to decrease locking overhead. The novel aspect of ISMGL is that it combines conventional multigranularity locking and nested transaction model with utilizing commutativity of methods. Our concurrency control scheme is applicable for realistic OODBSs in the presence of complex objects with shared subobjects. Lastly, we evaluate the performance of ISMGL by using a simulation study.

关键词： concurrency control nested transaction multigranularity locking object-oriented database systems

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ISSUES IN QUERY MODEL DESIGN IN object-oriented database-systems

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COMPUTER STANDARDS & INTERFACES 1991年第1-3期13卷 157-167页

作者： OZSU, MT STRAUBE, DD UNIV ALBERTA DEPT COMP SCIDATABASE SYST RES LABEDMONTON T6G 2H1ALBERTACANADA

The provision of a powerful query system, including a declarative query language and the systems support for efficiently processing queries is essential for the success of object-oriented database technology. Designing a query system involves making a large number of decisions, further complicated by the lack of a universally accepted object-oriented object data model. In this paper, object data model and query model design decisions are enumerated, alternatives are identified, and the tradeoffs are specified.

关键词： object-oriented database systems QUERY LANGUAGES object CALCULUS object ALGEBRA

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STATE OF ART AND OPEN ISSUES ON GRAPHICAL USER INTERFACES FOR object-oriented database-systems

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INFORMATION AND SOFTWARE TECHNOLOGY 1992年第11期34卷 721-730页

作者： KAPPEL, G TJOA, AM Institute of Statistics and Computer Science Department of Information Systems University of Vienna Liebiggasse 4/3-4 A-1010 Vienna Austria

Graphical user interfaces have become very popular for database systems because they increase the usability of these applications. The functionality and ease-of-use of the graphical user interface, however, depend on the expressiveness and complexity of the underlying data model. With the advent of new database technology based on powerful data models like the object-oriented data model, new challenges and new opportunities are posed in user interface design. In the paper critical issues of graphical user interface development for object-oriented database systems are discussed.

关键词： object-oriented database systems GRAPHICAL USER INTERFACES VISUAL PROGRAMMING

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SOFTWARE COMPONENTS FOR object-oriented database-systems

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INTERNATIONAL JOURNAL OF SOFTWARE ENGINEERING AND KNOWLEDGE ENGINEERING 1993年第2期3卷 165-192页

作者： BATORY, D VASAVADA, D UNIV TEXAS DEPT COMP SCIAUSTINTX 78712

Genesis is a software system generator for database management systems that relies exclusively on as-is large scale component reuse. We review the general model of software components on which Genesis is based and discuss component libraries for relational database systems that we have implemented. We then explain how we have evolved Genesis and its libraries to be able to synthesize object-oriented database systems. We study a subproblem of creating ''self-tuning'' software systems by examining the performance of selected components for object-oriented database systems.

关键词： INHERITANCE LARGE SCALE REUSE GENVOCA GENESIS RELATIONAL database systems object-oriented database systems

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TYPE-LEVEL ACCESS CONTROLS FOR DISTRIBUTED STRUCTURALLY object-oriented database-systems 2nd

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2ND EUROPEAN SYMP ON RESEARCH IN COMPUTER SECURITY ( ESORICS 92 )

作者： KELTER, U Praktische Informatik V Fachbereich Informatik FernUniversität Hagen Postfach 940 Hagen D-5800 Germany

ISBN: (纸本)354056246X

Structurally object-oriented database systems are a new class of dedicated data storage systems which are intended to form the basis of CAD, CASE, and other design environments which are to support large, distributed development teams. Several concepts of discretionary access controls (DAC) for such systems have been proposed;these concepts support nested complex objects and nested working groups. However, they do not support roles in development teams such as designers, reviewers, managers etc., whose access rights are typically given in terms of object types rather than only in terms of objects. This paper presents a concept of type-level DAC which is intended to complement instance-level DAC and to support roles in development projects. The concept consists of a formal model of the state of the object base with regard to access controls and a formula which derives from this state and the security context of a process the type-rights of this process. Our model has virtually no built-in, enforced policies;it allows users to realize a wide range of application-specific security policies. It supports multiple inheritance;in order to prevent inconsistent rights on types with common subtypes, certain consistency constraints are introduced. The model is group-oriented in that it supports nested working groups and inheritance of rights along group hierarchies. Access to individual types can be explicitly denied. It is implementable in a distributed system;the administration of rights can be fully decentralized. © Springer-Verlag Berlin Heidelberg 1992.

关键词： VIEWS DISCRETIONARY ACCESS CONTROLS object-oriented database systems DISTRIBUTION MULTIPLE INHERITANCE GROUP-ORIENTATION ACCESS CONTROL LISTS

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MIGRATION IN object-oriented database-systems - A PRACTICAL APPROACH

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SOFTWARE-PRACTICE & EXPERIENCE 1995年第10期25卷 1065-1096页

作者： HUEMER, C KAPPEL, G VIEWEG, S UNIV LINZ DEPT INFORMAT SYSTINST COMP SCIA-4040 LINZAUSTRIA

object-oriented database systems are designed to meet the requirements of advanced database applications such as computer-integrated manufacturing, These requirements may evolve in the course of time and may require the migration of the database application from one object-oriented database system to another, Traditional migration approaches for relational database systems fail when applied to object-oriented database systems. The goal of this paper is to fill this gap. The paper describes a framework for the migration of object-oriented database applications, Our approach is based on a detailed analysis of the involved database systems, of the application's database requirements, and of the resources available for the database migration. We illustrate our framework by means of a case study, which is migrating an electronic planning board system from the object-oriented database system ONTOS to objectStore.

关键词： object-oriented database systems MIGRATION ELECTRONIC PLANNING BOARD APPLICATION

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CACTIS - A SELF-ADAPTIVE, CONCURRENT IMPLEMENTATION OF AN object-oriented database-MANAGEMENT SYSTEM

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ACM TRANSACTIONS ON database systems 1989年第3期14卷 291-321页

作者： HUDSON, SE KING, R UNIV COLORADO DEPT COMP SCI BOULDER CO 80309 USA

Cactis is an object-oriented, multiuser DBMS developed at the University of Colorado. The system supports functionally-defined data and uses techniques based on attributed graphs to optimize the maintenance of functionally-defined data. The implementation is self-adaptive in that the physical organization and the update algorithms dynamically change in order to reduce disk access. The system is also concurrent. At any given time there are some number of computations that must be performed to bring the database up to date; these computations are scheduled independently and are performed when the expected cost to do so is minimal. The DBMS runs in the Unix/C Sun workstation environment. Cactis is designed to support applications that require rich data modeling capabilities and the ability to specify functionally-defined data, but that also demand good performance. Specifically, Cactis is intended for use in the support of such applications as VLSI and PCB design, and software environments.

关键词： Buffer management derived data object-oriented database systems self-adapted optimization

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REALIZING RELATIONAL STYLE OPERATORS AND VIEWS IN THE OGGETTO object-oriented database SYSTEM

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INFORMATION AND SOFTWARE TECHNOLOGY 1993年第4期35卷 207-216页

作者： MARIANI, JA Computing Department Lancaster University Bailrigg Lancaster LA1 4YR UK

It is generally held that SQL and the relational operators that underlie it are the cornerstone of current database technology;this strongly implies that future technology must also support SQL. The paper describes the practical implementation of relational style operators and views within an object-oriented database system, Oggetto, and discusses a number of issues and mechanisms raised by this work. These issues include ways in which the relational operators can be integrated with existing type lattice mechanisms to create virtual types, and further how these virtual types cam be populated with existing objects.

关键词： object-oriented database systems RELATIONAL ALGEBRA RELATIONAL OPERATORS VIEW MECHANISMS

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A STRAWMAN REFERENCE MODEL FOR AN APPLICATION PROGRAM INTERFACE TO AN object-oriented database

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COMPUTER STANDARDS & INTERFACES 1991年第1-3期13卷 123-138页

作者： PEREZ, E TEXAS INSTRUMENTS INC CTR COMP SCIINFORMAT TECHNOL LABDALLASTX 75265

This position paper provides a strawman reference model which can be used to compare and reason about an application program's interface (API) to an object-oriented Data Base system (OODBs), with an emphasis on object manipulation from an object-oriented programming language binding.1 We begin with an introduction of OODBs and describe the broad domain for an OODB reference model as well as the specific sub-domain we will discuss. Next, we describe some goals of the reference model for the specific sub-domain. A descriptive reference model is then described as consisting of a collection of design choices that can be used for comparing existing and future application program interfaces to OODBs. Finally, based on the descriptive reference model, we define a functional reference model that provides a much more precise description of the interface provided by one such OODB, Zeitgeist, being developed at Texas Instruments.

关键词： object-oriented database systems APPLICATION PROGRAM INTERFACE REFERENCE MODEL

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Design and implementation of the ROL deductive object-oriented database system

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JOURNAL OF INTELLIGENT INFORMATION systems 2000年第2期15卷 121-146页

作者： Liu, MC Univ Regina Dept Comp Sci Regina SK S4S 0A2 Canada

ROL is a deductive object-oriented database system that has been implemented at the University of Regina. It provides a uniform rule-based declarative language for defining, manipulating and querying databases, which integrates important features of both deductive databases and object-oriented databases. It supports object identity, complex objects, classes, class hierarchies, multiple inheritance with overriding and blocking, and schema definition. It also supports structured values such as functor objects and sets, treating them as first class citizens, and providing powerful mechanisms for representing both partial and complete information about sets. This paper describes its design and implementation. An important novel feature of the implementation is that it combines top-down and bottom-up evaluation strategies and automatically selects a strategy based on the nature of the query and data in the database.

关键词： deductive database systems object-oriented database systems query processing rapid prototyping rule-based systems

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