分布式数据库

This method advances the usability of distributed and parallel database system.

本文第一章简要介绍了分布式并行数据库的研究背景和发展状况。

The theme uses structure design of WUHAN DAMING company OAS for example, to actualize GIS and OAS integration exploitation, preferring two settlement ways: firstly, if you wants GIS and other computer system for integration no suture, you must use integration exploitation of GIS fully, and use tools software of GIS and graphic exploitation language in integration re-exploitation;then it is fully to utilize space data, to achieve effective assistant decision-making system;and, to research and to design database of based on metadata technique, distributed data management and share technique.

论文以武汉达明公司的办公自动化系统的结构设计为例，对实现GIS与OAS的集成开发，提出了两种解决办法：一是如果要让GIS 可以很方便地与各种计算机信息系统进行一体化的无缝集成的话，就要充分地利用GIS 的集成开发方式，结合GIS 工具软件与可视化开发语言进行集成的二次开发；二是要充分地利用空间数据，实现有效的辅助决策系统，对基于元数据技术的、分布式的数据管理与共享技术的数据库系统进行研究和设计。

A distributed isomerous DataBase System is developed to test the above model, whose results are wonderful.

此外，本文还实现了一个分布式异构数据库检索系统，从实践上对该模型进行测试，取得了良好的效果。

However, the state-of-the-art performance of web image retrieval is still far from satisfaction. The main difficulty resides in the fact that the Web is a huge distributed database and on-line users would not like to wait overlong for results of retrieval.

但同时它又是一个极为困难的问题，困难主要来源于Web图像检索环境是一个规模惊人的分布式图像数据库，而且互联网用户一般不愿意花过长的时间等待检索结果。

Improvement on the parallel algorithm of association rule

首先简单介绍了相关规则及其并行开采算法的一些基本情况，然后指出了现有算法在分布式异构数据库中不能有效利用计算资源和造成信息丢失的问题。

The architecture of Client/Server based on transaction middleware is a typical kind of the distributed On-line Transaction Processing, becoming a major platform of enterprise information system, which offers communication of striding platform, loading balance, fault-tolerant and resumable ability, and strengthens a new generation middleware in common with 3-layer architecture provided with the strong security, excellent management and high availability in common. Numerous distributed system, different database and different network environment are closely linked up among an enterprise, offering the function of mutual operation on application layer.

基于交易中间件的C／S结构是一种典型的分布式事务处理系统，成为构筑企业信息系统的主流平台，它提供了强大的跨平台通讯、负载平衡、容错及其故障恢复能力，并在这个基础上进一步强化了安全性、可管理性和高可用性的新一代通用型三层结构平台的中间件，把企业中众多的异构系统、异构数据库、不同网络环境紧密的联系起来，并在应用层提供了互操作性的功能。

And they also relate to the high level requirements such as complicated logical calculation, distributed application deployment, gradually and sectionally implementation.

纷繁复杂的应用系统涉及到多种复杂的应用环境、多种操作系统平台和多种数据库平台等，还涉及到复杂的逻辑运算、分布式的应用部署、分阶段分部门的具体实施等高级需求。

In research and development of the system, mainly concluding key technologies of software-hardware environment analysis, no adapter interlink, terminal simulation, communication, sharing resources, binary file transfer algorithm , concurrent process, database-dumping and sharing, and to accomplish the basic a software design of E-classroom by adopting distribution system concept in minicomputer side , to accomplish the main software design of E-classroom by Winsock in microcomputer side , to study teacher software integration , try to realize transparent communication in the highest limit and sharing resources in the fullest extent , at last, weak and counter measure of the system is given, and the overall objective of heterogeneous computer is given to try to provide resemble system development with theory guide.

该系统的研究与设计过程中主要涉及软硬件环境分析、异型机无网卡互连、终端仿真、异型机通信、资源共享、二进制文件传输算法、并发进程、数据库转储与共享等关键技术，利用DSM分布式系统的概念完成了小型机部分电子教室的基础性软件设计，利用Winsock完成了微型机部分电子教室的主要功能模块，利用并发进程的概念研究了教师机软件的集成问题，使异型机用户之间达到最大限度的透明通信及充分的资源共享，给出了异构电子教室的弱点及解决对策，提出了系统的总体目标，力争为类似系统的研制提供理论指导。

China Infosearch engine consists of distributed parallel spider, whole-lengthsearch database, intelligent information processing model,CGI and smart browser, etc. It supports whole-length search, concept search basedon language database and concept search based on knowledge database.

首信搜索引擎主要由分布式并行Spider、全文检索数据库、智能信息处理模块、CGI和智能浏览器等模块构成，支持全文检索、基于语料库的概念检索和基于知识库的概念检索。

Analyzes how to improve the method of reliability based multi - tie distributed application system, Presents datable eormection pooling, object tx3oling, fault model and dynamic load balancing based on briefcase and negative feedback model, Applies DCOM/COM ＋ middleware in the models, and gives a project instance on the theory.

通过对提高分布式多层应用系统可靠性方法的分析，进而提出了数据库连接池、对象池、公文包机制容错模型和基于负反馈机制的动态负载平衡模型等几种可靠性关键技术，并结合DCOM／COM＋中间件技术和具体实例说明了这些技术的应用。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。