This is because virtual database abstraction in Slice follows a composite design pattern.
这是因为Slice内的虚拟数据库抽象遵循的是复合设计模式。
The federation server is a virtual database with all of the capabilities of a relational database.
联合服务器是一个虚拟数据库，具有关系数据库的所有功能。
Access to heterogeneous databases is provided through requests expressed as queries on a canonical, virtual database.
通过将请求表达成在一个正规、虚拟的数据库上的查询来提供对异种数据库的访问。
Data federation strives to leave data in its original location and to create what can be thought of as a virtual database.
数据联合力图将数据放在其原始位置上，并创建虚拟数据库。
Instead, administrators define a single virtual database image to provide programmers with transparent access to diverse data.
管理员可以定义一个单独的虚拟数据库镜像，为程序员提供对不同数据的透明的访问。
Because DB2 II presents a virtual database image of remote data sources, we didn't need to write code for each of these activities.
因为DB 2II为远程数据源提供了一个虚拟的数据库映像，所以我们不需要为每个这样的活动编写代码。
Using the advantages of mobile agent in distributed information processing, the paper proposes a new kind of virtual database module based-on mobile agent.
利用移动代理在分布式信息处理方面的优越性，本文提出了一种基于移动代理的虚拟数据库模型。
For a JTA EntityManager, the JTA transaction is propagated to the underlying resource manager (i.e., the virtual database, which relays the transaction to physical databases).
对于JTAEntityManager, JTA事务被传递到底层的资源管理器(即虚拟数据库，由它将这个事务中继到物理数据库)。
Virtualized: Information Integrator provides a federated system to act as a virtual database which can transparently access any data, regardless of its location and SQL dialect.
虚拟化：Information Integrator提供了一个联邦系统来担当虚拟数据库，它能够透明地访问任何数据，不管自身的位置在哪里，也不管使用的是哪种SQL方言。
Federation takes you to the next level of information integration, allowing the DB2 federated system to act as a virtual database where remote objects can be queried like local tables.
联邦技术将您带到更高级别的信息集成，它允许DB 2联邦系统充当一个虚拟的数据库，使得对远程对象的查询和对本地表的查询一样简单。
Distance Education; Virtual Database; Middleware; XML.
远程教育；虚拟数据库；中间件；xml。
SQLite's utilization of a virtual machine, the virtual Database Engine (VDBE), makes it easy to debug, modify, and extend SQLite's core.
SQLite通过利用虚拟机和虚拟数据库引擎(VDBE)，使调试、修改和扩展SQLite的内核变得更加方便。
SQLite's utilization of a virtual machine, the virtual Database Engine (VDBE), makes it easy to debug, modify, and extend SQLite's core.
SQLite通过利用虚拟机和虚拟数据库引擎(VDBE)，使调试、修改和扩展SQLite的内核变得更加方便。
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