数据库

Then, the necessary conditions for testing non-redundancy and predigestion and the analysis of loseless decomposability are discussed.

给出了与或图数据库的定义、规范化理论、无冗余和既约化理论，证明了它与关系数据库的等价性；然后给出了依赖集存在冗余和既约的必要条件，讨论了无损分解在与或图形式下的特性，从而形成了与或图数据库关系模式分解的规范化算法。

The thesis first presents the definition and deciding theorem of different match types and derivability, then proposes corresponding deciding algorithms and query processing algorithms for different network links taking their features and optimization goals into account. Using these algorithms, associative access can be supported by the client cache more efficiently. In order to study the performance of our work, we have conducted a series of simulation experiments.

本文给出相应的模拟模型系统以及工作负载的描述，把基于本文提出的强、弱连接下查询处理、替换和一致性维护策略的缓存的数据库系统与标准客户—服务器数据库系统、基于传统缓存的数据库系统进行比较，试验测试了在不同网络连接，不同工作负载，不同缓存大小下各个系统的性能。

The data transformation platform is designed in accordance with modularization, which masks the access from upper application by data wrapping module and submits DataSet objects to upper application. DataSet exchange module finishes heterogeneous data exchange by using XML capsulation of DataSet. For the synchronization process of heterogeneous data, it uses table trigger and Updates Information Table to capture change from source database table. The Update Information Table keeps the DML statements operated on tables which need to be synchronized. In the course of synchronization, synchronization module extracts DML operation field from Regenerate Information Table DataSet. At last, it updates the table fields of destination database by using command object.

数据转换平台的实现采用模块化设计，通过数据包装模块屏蔽上层应用对数据库的访问和将包装好的数据集对象提交给上层应用来实现，数据转换模块利用DataSet对XML的封装完成底层异构数据的交换；在异构数据同步的处理上，采用触发器结合更新信息表的方式获取源数据库上表内容的变化，更新信息表保存作用在同步表上的DML语句，然后在同步的过程中利用数据转换平台的同步模块对更新信息数据集中的DML操作字段进行数据抽取，最后通过命令对象将变化更新到目的数据库的表字段中。

Distributed database,an important part of database system, is a combination of the technology of database and Internet.

分布式数据库是数据库技术与网络技术相结合的产物，是数据库领域中一个重要的分支。

Distributed database, an important part of database system, is a combination of the technology of database and Intemet.

分布式数据库是数据库技术与网络技术相结合的产物，是数据库领域中一个重要的分支。

In accQrdance with the concerned isomerism and distributivity of the database system in the long-distance education, and variety of database inter-connectivity technology, we law lessons from the successful application in TCP/IP communication protocol, and adapt to use the Layer thought to realize the share of distributive isomeric database information.

针对目前远程教育中所涉及的数据库系统的分布性和异构性，数据库互连技术的多样性，本文欲借鉴网络通信协议的成功之处，采用分层结构的思想去实现分布式异构数据库信息的共享。

Moreover, as the problem of how to connect other application system, it discusses the integration problem of Domino and RDBMS, realizes visiting external RDBMS in Domino via Open Database Connection interface.

针对如何连接企业内部的其他应用系统这一问题，讨论了Domino和关系型数据库管理系统的集成问题，并实现了在Domimo中通过开放数据库连接接口访问外部关系数据库。

Select the Database of State Essential Druggery.

在本网站数据库栏目中选择"多库融合检索平台"并点击"进入"，在多库融合检索平台界面中的查询框中（如下图中红色圆圈所指处）键入待查询的信息，并在其中的数据库表中选择国家基本药物数据库，点击列表框右下角的"提交"按钮

On the home page of the Database of State Essential Druggery, type your search terms enter the query box. Select the field name to limit the search term, and then select Boolean operator to add multiple search terms. After than click the search button.

在本网站数据库栏目中选择"国家基本药物数据库"并点击"进入"至国家基本药物数据库单表检索界面，在其查询框中输入待检索的内容，选择相应的字段和逻辑关系（and ，or， not）来组织查询语句，然后点击"检索"按钮。

The transferring of database is to want to be in the purpose database to reappear the source database information, this kind of emersion include the information contents and the intact structural emersion.

数据库的交互就是要在目的数据库再现源数据库信息，这种再现包括信息内容和结构的完整再现。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。