对象-关系数据库对多媒体的支持技术

对象－关系型数据库已成为当今数据库领域研究和发展的热点。文章以多媒体数据管理和应用的需求为出发点,讨论了对象－关系型数据库对多媒体数据的管理方法,即通过对关系数据库管理系统（ＲＤＢＭＳ）进行扩展,使之能支持新引入的用户定义类型（ＵＤＴ）、用户定义函数（ＵＤＦ）、大对象（ＬＯＢ）、关系扩展器（ＲＥＬＡＴＩＯＮＡＬ ＥＸＴＥＮ－ＤＥＲ）等对象－关系模型特色,并通过数据链技术控制机制来实现对数据库及外部文件系统中大量的复杂多媒体数据的管理。这些多媒体扩展机制保留了所有的ＲＤＢＭＳ的长处和优点,增加了对复杂的多媒体应用的支持。     

对象-关系数据库对多媒体的支持技术

对象－关系型数据库已成为当今数据库领域研究和发展的热点。文章以多媒体数据管理和应用的需求为出发点,讨论了对象－关系型数据库对多媒体数据的管理方法,即通过对关系数据库管理系统（ＲＤＢＭＳ）进行扩展,使之能支持新引入的用户定义类型（ＵＤＴ）、用户定义函数（ＵＤＦ）、大对象（ＬＯＢ）、关系扩展器（ＲＥＬＡＴＩＯＮＡＬ ＥＸＴＥＮ－ＤＥＲ）等对象－关系模型特色,并通过数据链技术控制机制来实现对数据库及外部文件系统中大量的复杂多媒体数据的管理。这些多媒体扩展机制保留了所有的ＲＤＢＭＳ的长处和优点,增加了对复杂的多媒体应用的支持。     

ODBC技术在工程CAD系统中的应用

该文为了解决工程ＣＡＤ系统中数据处理效率低的问题，提出了采用ＯｐｅｎＤａｔａｂａｓｅＣｏｎｎｅｃｔｉｖｉｔｙ（开放式数据库联接，ＯＤＢＣ）的技术把不同类型的输入、输出数据定向于数据库管理系统中，同时利用了ＭＦＣ（ＭｉｃｒｏｓｏｆｔＣ基本类库）中的ＤＡＯ（数据库存取对象）技术对数据库进行管理和查询，从而提高了整个ＣＡＤ系统的集成化程度。并以一个基于ＯＤＢＣ的轻钢厂房ＣＡＤ系统为例子进行深入的阐述。     

数据仓库,联机分析处理和联机分析开采研究

本文介绍了当前数据仓库系统的应用需求、基本特征、体系结构和构建技术;对传统的联机事务处理（ＯＬＴＰ）与联机分析处理（ＯＬＡＰ）进行了比较;分析了在数据仓库中实施ＯＬＡＰ使用的多维数据视图概念模型,同时介绍了建立在多维数据库（ＭＤＤ）上的ＭＯＬＡＰ,以及建立在星型（雪花）模型基础之上的ＲＯＬＡＰ两种联机分析技术,并对数据开采联机分析处理在数据仓库系统中的集成－联机分析开采（ＯＬＡＭ）进行了研究。     

Delphi4与数据库的连接及配置

本文讨论Ｄｅｌｐｈｉ４在数据库应用开发中与各类数据源（Ｂｏｒｌａｎｄ 系列、ＯＤＢＣ系统以及Ｏｒａｃｌｅ８、ＭＳ ＳＱＬＳｅｒｖｅｒ７等大型数据库）的连接机制与配置问题     

ADO数据存取技术

Ａｃｔｉｖｅ数据对象（Ａｃｔｉｖｅ Ｄａｔａ Ｏｂｊｅｃｔ,简称ＡＤＯ）,是Ｍｉｃｒｏｓｏｆｔ开发数据库应用程序的面向对象的新接口,ＡＤＯ技术提供了如同ＤＡＯ一样的采用对象模型的数据库访问技术,但它比ＤＡＯ和ＲＤＯ更加灵活,具有广泛的应用前景,本文在分别介绍了ＡＤＯ应用原理、结构和对象的基础上,举例阐述了ＡＤＯ的数据存取方法。     

一种基于图形数据OODBMS的设计方法

本文介绍了一种利用面向对象方法设计和实现的基于图形数据的面向对象数据库管理系统（ＯＯＤＢＭＳ）。文中讨论了ＯＯＤＢＭＳ的结构和功能;定义了基于图形的数据模型和数据模式以及对象管理技术。     

开放系统的异构数据库互操作模型

该文设计并初步实现了一个基于ＯＤＢＣ并结合ＣＯＲＢＡ特性的开放系统异构数据库互 模型Ｉｎｔｅｒ－ＤＢＭＭ,ＩｎｔｅｒＤＢＭＭ提供了高效的可视化互 界面和高级语言数据库库访问调用级接口,并对ＯＤＢＣ进行封装使之能够方便地集成到ＣＯＲＢＡ系统中。     

ODMG''93的ODL、OQL语言到F-logic程序的转换

为了分析ＯＤＭＧ’９３数据对象模型的语义,本文给出了一套转换规则,将ＯＤＭＧ’９３的对象定义语言ＯＤＬ、对象查询语言ＯＱＬ转换到Ｆ－ｌｏｇｉｃ程序,并结合面向对象数据库管理系统Ｏ２,通过具体的实例陈述了该转换规则是完全的。     

分层多媒体数据模型的研究及应用

本文提出了一种分层多媒体数据模型，以有效地解决多媒体数据的表示，存储和媒体同步。该模型分为数据定义层ＤＤＬ，数据操纵层ＤＭＬ，数据显示层ＤＰＬ和控制层ＣＬ四层，这里重点阐述了ＤＤＬ和ＤＭＬ层。在多媒体办公系统ＴＨＭＯＳ中，我们综合应用了ＬＭＤＭ的思想，较好地实现了多媒体文件的数据库功能。     

面向对象工程数据库管理系统O2S并发事务模型

Ｏ２Ｓ是我们在ＳＵＮ工作站上开发的一面向对象工程数据库管理。本文针对工程应用域事务的嵌套性，长时性，数据库逻辑分区性和涉及数据量大的四个显著特点，阐述了Ｓ２Ｓ的事务管理模型。对工程域事务的管理，数据库的恢复和封锁技术进行了讨论。     

A Novel Network Management Model Based on XML for Service and Resource

XML can allow for the interchange of data between management applications using different information models.Furthermore, CORBA technique is increasingly used in the management of service and resource in the heterogeneous network environment. As the scheme of information arrangement of CORBA is flat file style, which handles querying, deleting, and inserting information inefficiently, this paper puts forward a novel network management model based on XML in the domain of the management of CERNET (China Education and Research Network), which has used a tree structure of managed objects arrangement to provide efficient operation on managed objects. In addition, arrangement, definition, implementation and finding schemes for CORBA managed objects using XML are also given by the tree structure, and thus can arrange and retrieve managed objects efficiently.     

Database/domain approach to distributed systems management

Distributed systems are now used in a variety of environments and at different levels within business organizations, both in offices and factories. As the number of devices attached to these systems grows, and as the systems become internetworked together, management tools become increasingly essential to retain control of the complete distributed system. A distributed systems management model is presented which is suitable for implementation in the real world. A key feature of this model is its construction from independently managed domains. The DSM functionality is distributed in operation, and overall control is achieved through the cooperation of individual domain management systems, in which human managers make use of management tools provided to control their own domain of responsibility. Another feature of the design is the use of management databases, one per domain. A commercially available database has been used to demonstrate the feasibility of the design. DSM processes are used to query and update the MDBs, and human managers having the appropriate authority may also directly access the MDBs. Monitored management information on all managed objects within a domain is processed and stored in that domain's MDB. The idea for the MDB is derived from the concept of a management information base described in the International Organization for Standardization Open Systems Interconnection management standards. However, whereas the OSI MIB is a virtual concept, the MDB is a physical realization, and it is not intended to be a direct implementation of the MIB as such.     

一种面向对象的被管网络资源的管理维护模型

使用面向对象的方法将网络管理信息抽象为两个层次－被管对象层和网管对象层,其中被管对象层是对被管网络资源的抽象,并给出了被管对象,被管对象语义的定义,分类和描述,设计了基于被管对象语义对被管对象进行管理和维护结构模型。     

Algorithms for asynchronous parallel processing of object-orienteddatabases

Management of large quantities of complex data is essential in many advanced application areas. Object-oriented (OO) database management system have been developed to effectively model and process the complex domain knowledge. They have been shown to outperform some existing relational systems. The existing implementations of OO database management systems attempt to improve the efficiency of OO queries by explicitly capturing the relationships among objects. However, the execution of complex queries involving the retrieval of objects from many classes and relationships among them causes the existing system to operate inefficiently. In this paper, we present parallel algorithms for the processing of queries against a large OO database. The algorithms are based on a closed model of query processing pattern-based access instead of the conventional value-based access. During processing, the algorithms avoid the execution of time-consuming join operations by making use of the explicitly stored object associations. Generation of large quantities of temporary data is avoided by marking objects using their identifiers and by employing a two-phase query processing strategy. A query is processed by concurrent multiple waves, thereby improving parallelism avoiding the complexities introduced in their sequential implementation. The correctness and the performance of the parallel algorithms have been tested and analyzed by running parallel programs on a 32-node transputer based parallel machine designed and developed at the IBM Research Center at Yorktown Heights, New York. Benchmark queries of different semantic complexities are generated, and their performance is analyzed for various data and query parameters     

On Model, Memory Management and Interface in EDBMS/3

Engineering application domains need database management systems to supply them with a good means of modeling,a high data access efficiency and a language interface with strong functionality.This paper presents a semantic hypergraph model based on relations,in order to express many-to-many relations among objects belonging to different semantic classes in engineering applications.A management mechanism expressed by the model and the basic data of engineering databases are managed in main memory.Especially,different objects are linked by different kinds of semantics defined by users,therefore the table swap,the record swap and some unnecessary examinations ar reduced and the access efficiency of the engineering data is increased.C language interface that includes some generic and special functionality is proposed for closer connection with application programs.     

DrawCAD: using deductive object‐relational databases in CAD

Computer‐aided design (CAD) involves the use of computers in the various stages of engineering design. CAD has large volumes of data with complex structures that need to be stored and managed effectively and properly. Database systems provide general purpose programs that can be used to access and manipulate large amounts of data stored in the database. They also provide an independence between the program accessing data and the database. It is therefore important to use database systems to store CAD data in the most efficient and effective manner for easy retrieval and better management. Graphical objects can be created, in CAD, by reusing previously created objects. The data of these objects have references to the other objects they contain. Deductive object‐relational databases not only provide direct support for the effective storage and efficient access to large amounts of data with complex structures on disk, but also perform the inferences and computations to obtain the complete data of graphical objects that reuse other objects. They should be able to play a major role in CAD systems. This is the idea behind the development of the DrawCAD system. DrawCAD is a CAD system built on top of the Relationlog object‐relational deductive database system. It facilitates the creation of graphical objects by reusing previously created objects. The DrawCAD system illustrates how CAD systems can be developed, using database systems to store and manage data and also perform the inferences and computations that are normally performed by the application program. Copyright © 2003 John Wiley & Sons, Ltd.     

MIS系统权限管理及标准件

文章着重介绍了一种ＭＩＳ系统应用层的权限管理模型,该模型通过对用户对对象的操作权限的分析,将ＭＩＳ系统的权限要求分为四类：操作员用户的标识及确认,操作员对系统模块的执行权限,系统模块对数据库数据的存取权限及操作员用户对数据库数据的存取权限。另外,文章最后简要给出了在此模型上建立的一个应用系统权限管理构件。     

The Iris architecture and implementation

The goals of the Iris database management system are to enhance database programmer productivity and to provide generalized database support for the integration of future applications. Iris is based on an object and function model. Iris objects are typed but unlike other object systems, they contain no state. Attribute values, relationships and behavior of objects are modeled by functions. The Iris architecture efficiently supports the evaluation of functional expressions. The goal of the architecture is to provide a database system that is powerful enough to support the definition of functions and procedures that implement the semantics of the data model. An overview of the data model is provided, the architecture is described in detail, and implementation experience and usage of the system are discussed     

Internet环境中的数据库信息发布途径*

当Internet成为信息社会最重要的传递手段以后,应用系统的范围和客户端的结构就都多样化了.与Internet的集成成为数据库研究者面临的非常急迫和重要的研究问题.因为多数已经存放在计算机系统内的数据是驻留并由数据库系统管理的,并且大量即将进入计算机系统的数据也将通过数据库系统管理,目前的数据库系统并不支持与Internet的集成,它们将成为未来的遗留系统（Legacy System）.该文介绍了作者利用Internet实现TCPIMS系统数据库信息发布工作的设计思想,描述了基于WWW视图的Intern