Theory Pract. Object Syst.最新文献

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In the Trenches with ObjectStore 在ObjectStore的战壕中

Theory Pract. Object Syst.

Pub Date : 1999-12-01 DOI: 10.1002/1096-9942(1999)5:4<201::AID-TAPO2>3.0.CO;2-6

D. M. Hansen, Daniel R. Adams, D. Gracio

This article discusses our experience with the ObjectStore object-oriented database management system from Object Design, Inc. We have been using ObjectStore since 1992 as the database management system at the core of two significant projects. This is a “war story” of sorts, and while we have been winning the war and succeeding with ObjectStore, the battles have not been easy. © 1999 John Wiley & Sons, Inc.

引用次数: 4

The Electronic Library Project: SGML Document Management System Based on ODBMS 电子图书馆项目:基于ODBMS的SGML文档管理系统

Theory Pract. Object Syst.

Pub Date : 1999-12-01 DOI: 10.1002/1096-9942(1999)5:4<217::AID-TAPO4>3.0.CO;2-S

P. Futtersack, Didier Bolf

引用次数: 0

O2 and The ODMG Standard: Do They Match? O2和ODMG标准:它们匹配吗?

Theory Pract. Object Syst.

Pub Date : 1999-12-01 DOI: 10.1002/1096-9942(1999)5:4<239::AID-TAPO6>3.0.CO;2-E

S. Alagic

引用次数: 3

Object Management for a Visual Data Analysis Tool 对象管理的可视化数据分析工具

Theory Pract. Object Syst.

Pub Date : 1999-12-01 DOI: 10.1002/1096-9942(1999)5:4<227::AID-TAPO5>3.3.CO;2-D

Makoto Onizuka, S. Isobe, Kyotaro Horiguchi

This paper reports the advantages and disadvantages in applying an ODBMS (Object-oriented database management system) and an ORDBMS (Object relational database management system) to INFOVISER's object management scheme, a visual data analysis tool that we have been researching and developing. This paper also surveys a DBMS called LiteObject, which solves the main problems found in existing DBMSs, such as the complexity of implementing a versioning procedure and performance problems in loading a large number of instances. LiteObject offers version management based on constraints that exclude check in/out procedures from the application source code which decreases the degree of complexity. In addition, LiteObject offers a bulk loading interface to applications and manages several instances in one container. This reduces the amount of processing by removing identical steps in the process of inserting instances and adding instances to a collection type attribute. © 1999 John Wiley & Sons, Inc.

本文介绍了我们研发的可视化数据分析工具INFOVISER的对象管理方案采用ODBMS(面向对象数据库管理系统)和ORDBMS(对象关系数据库管理系统)的优缺点。本文还研究了一个名为LiteObject的DBMS，它解决了现有DBMS中存在的主要问题，如实现版本控制过程的复杂性和加载大量实例时的性能问题。LiteObject提供了基于约束的版本管理，这些约束排除了应用程序源代码中的签入/签出过程，从而降低了复杂性。此外，LiteObject为应用程序提供了一个批量加载接口，并在一个容器中管理多个实例。通过删除插入实例和向集合类型属性添加实例的过程中的相同步骤，减少了处理量。©1999 John Wiley & Sons, Inc

引用次数: 0

A Performance Study of Object Database Management Systems 对象数据库管理系统的性能研究

Theory Pract. Object Syst.

Pub Date : 1999-12-01 DOI: 10.1002/1096-9942(1999)5:4<263::AID-TAPO8>3.0.CO;2-5

A. Chaudhri, J. Mccann, P. Osmon

Vendors of Object Database Management Systems (ODBMSs) have used a number of different architectural approaches for their products. Generally, most previously published ODBMS performance work focused on engineering applications and very little known about the suitability of ODBMS implementations for other application domains. In this paper, we redress this imbalance and evaluate three commercial products (two pure ODBMSs and one hybrid Object-Relational DBMS) to determine the suitability of each for six different application domains. Our results show statistically significant performance differences between the products under test. Furthermore, the hybrid product consistently performed badly on most of our tests. We also found that testing the scalability of products in terms of database size, as well as the choice of language interface, can be very important. Furthermore, the use of a dedicated database load utility can save considerable time when loading simple data, but generating complex data for the load utility requires considerable manual intervention. © 1999 John Wiley & Sons, Inc.

对象数据库管理系统(odbms)的供应商已经为他们的产品使用了许多不同的体系结构方法。一般来说，以前发表的大多数ODBMS性能工作都集中在工程应用程序上，很少有人知道ODBMS实现对其他应用程序领域的适用性。在本文中，我们纠正了这种不平衡，并评估了三个商业产品(两个纯odbms和一个混合对象-关系DBMS)，以确定每个产品对六个不同应用领域的适用性。我们的结果显示，在测试产品之间存在统计学上显著的性能差异。此外，混合产品在我们的大多数测试中一直表现不佳。我们还发现，根据数据库大小以及语言接口的选择来测试产品的可伸缩性是非常重要的。此外，在加载简单数据时，使用专用的数据库加载实用程序可以节省大量时间，但是为加载实用程序生成复杂数据需要大量的人工干预。©1999 John Wiley & Sons, Inc

引用次数: 2

Building CORBA Applications with an Object Database System 用对象数据库系统构建CORBA应用程序

Theory Pract. Object Syst.

Pub Date : 1999-12-01 DOI: 10.1002/1096-9942(1999)5:4<209::AID-TAPO3>3.3.CO;2-N

John C. Chen

引用次数: 3

Data-intensive Intra- and Internet Applications based on Java, CORBA, and the World Wide Web 基于Java、CORBA和万维网的数据密集型内部和Internet应用程序

Theory Pract. Object Syst.

Pub Date : 1999-08-23 DOI: 10.1002/(SICI)1096-9942(1999)5:3<181::AID-TAPO5>3.0.CO;2-C

Jürgen Sellentin, B. Mitschang

Intra/Internet technology has become a key issue in the development of modern systems. Nowadays it is no longer sufficient to present static information pages through the WWW, instead we need interactive applications that may even compute complex results or process large data sets. In this paper, we describe a prototype based on Java and CORBA. Both represent modern concepts that have been developed to fulfill these requirements. Their combination results in the kind of data processing we want to apply to the WWW: First, portable, powerful, modular and even reusable client programs instead of cryptic HTML scripts, second, well-defined interfaces, and, third, efficient server processes separated from the WWW server and its CGI extensions. Communication is controlled by a fault tolerant CORBA layer, which also enables server development using a different language than Java. In this paper, we focus on data-intensive applications, like, e.g., typical database applications and information systems, that are designed to run in Intra/Internet environments. Besides a discussion of CORBA and its data shipping capabilities, we take a closer look at Java and its runtime behavior. Finally, we report on the experiences gathered with our prototype system and its testbed application. Results measured within the last two years show that technology has already moved in the right direction, but performance is still a critical issue. The system described in this paper has also been used to gather experiences with and to influence the new language binding of the Standard Data Access Interface (SDAI) of the Standard for the Exchange of Product Data (STEP, ISO 10303) to Java. SDAI technology is extensively used in engineering applications and together with CORBA and WWW technology it provides the primitives to build on-line information systems, like catalogues or diagnostic systems. © 1999 John Wiley & Sons, Inc.

intranet /Internet技术已成为现代系统开发中的一个关键问题。如今，通过WWW呈现静态信息页面已经不够了，我们需要交互式应用程序，甚至可以计算复杂的结果或处理大型数据集。本文描述了一个基于Java和CORBA的原型。两者都代表了为满足这些要求而开发的现代概念。它们的结合产生了我们想要应用于WWW的那种数据处理:第一，可移植、强大、模块化甚至可重用的客户端程序，而不是神秘的HTML脚本;第二，定义良好的接口;第三，与WWW服务器及其CGI扩展分离的高效服务器进程。通信由容错CORBA层控制，它还支持使用与Java不同的语言进行服务器开发。在本文中，我们将重点关注数据密集型应用程序，例如，典型的数据库应用程序和信息系统，这些应用程序被设计为在Intra/Internet环境中运行。除了讨论CORBA及其数据传输功能之外，我们还将深入研究Java及其运行时行为。最后，我们报告了我们的原型系统及其测试平台应用所收集的经验。过去两年的测量结果表明，技术已经朝着正确的方向发展，但性能仍然是一个关键问题。本文中描述的系统还被用于收集经验，并影响产品数据交换标准(STEP, ISO 10303)的标准数据访问接口(SDAI)与Java的新语言绑定。SDAI技术广泛应用于工程应用，它与CORBA和WWW技术一起提供了构建在线信息系统的基本要素，如目录或诊断系统。©1999 John Wiley & Sons, Inc

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引用次数: 1

SEMCOG: A Hybrid Object-based Image and Video Database System and Its Modeling, Language, and Query Processing SEMCOG:一个基于对象的混合图像和视频数据库系统及其建模、语言和查询处理

Theory Pract. Object Syst.

Pub Date : 1999-08-23 DOI: 10.1002/(SICI)1096-9942(1999)5:3<163::AID-TAPO4>3.3.CO;2-A

Wen-Syan Li, K. Candan

引用次数: 12

Managing Historical Semistructured Data 管理历史半结构化数据

Theory Pract. Object Syst.

Pub Date : 1999-08-23 DOI: 10.1002/(SICI)1096-9942(1999)5:3<143::AID-TAPO3>3.0.CO;2-S

S. Chawathe, S. Abiteboul, J. Widom

Semistructured data may be irregular and incomplete and does not necessarily conform to a fixed schema. As with structured data, it is often desirable to maintain a history of changes to data, and to query over both the data and the changes. Representing and querying changes in semistructured data is more difficult than in structured data due to the irregularity and lack of schema. We present a model for representing changes in semistructured data and a language for querying over these changes. An important feature of our approach is that we represent and query changes directly as annotations on the affected data, instead of indirectly as the difference between database states. We describe the implementation of our model and query language. We present extensions that permit convenient snapshot-based access in our change-based data model. We also describe our design and implementation of a wind query subscription service that permits users to subscribe to changes in semistructured information sources. © 1999 John Wiley & Sons, Inc.

半结构化数据可能是不规则和不完整的，并且不一定符合固定的模式。与结构化数据一样，通常需要维护数据更改的历史记录，并对数据和更改进行查询。由于不规则性和缺乏模式，半结构化数据中的变化表示和查询比结构化数据中的变化更加困难。我们提出了一个表示半结构化数据变化的模型和一种对这些变化进行查询的语言。我们的方法的一个重要特性是，我们直接将更改表示为受影响数据上的注释，而不是间接地表示为数据库状态之间的差异。我们描述了模型和查询语言的实现。我们提供的扩展允许在基于更改的数据模型中方便地进行基于快照的访问。我们还描述了wind查询订阅服务的设计和实现，该服务允许用户订阅半结构化信息源中的更改。©1999 John Wiley & Sons, Inc

引用次数: 86

Space and Time-Efficient Hashing of Garbage-Collected Objects 垃圾收集对象的空间和时间效率哈希

Theory Pract. Object Syst.

Pub Date : 1999-04-01 DOI: 10.1002/(SICI)1096-9942(1999)5:2<119::AID-TAPO5>3.3.CO;2-H

Ole Agesen

The hashCode() method found in the JavaTM programming language, and similar methods in other languages, map an arbitrary object to an integer value that is constant for the lifetime of the object. We review existing implementations of the hash operation, specifying the kinds of memory systems for which they work. Then we propose a new implementation of hashing for the hardest case: memory systems with compaction and direct pointers. Our proposal uses just two bits of space per object for the (majority of) objects that are never hashed. © 1999 John Wiley & Sons, Inc.

引用次数: 7

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