远程教育；虚拟数据库；中间件；xml。
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。
Data federation strives to leave data in its original location and to create what can be thought of as a virtual database.
这是因为Slice内的虚拟数据库抽象遵循的是复合设计模式。
This is because virtual database abstraction in Slice follows a composite design pattern.
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。
The federation server is a virtual database with all of the capabilities of a relational database.
Slice引入了抽象的虚拟数据库来绕过底层的物理数据库分区或划分。
Slice introduces the abstraction of a virtual database to encompass the underlying physical database partitions or shards.
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。
Instead, administrators define a single virtual database image to provide programmers with transparent access to diverse data.
可以决定不再需要原始源domino数据库，仅使用虚拟数据库就可以满足所有需要。
You may decide that you no longer need the original source Domino database and that working with only the virtual database meets all of your needs.
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。
Using the advantages of mobile agent in distributed information processing, the paper proposes a new kind of virtual database module based-on mobile agent.
每个片各自排序了的执行结果被合并，并且在内存内由虚拟数据库再次进行排序，之后才会呈现给此应用程序。
The respective sorted results from each slice are merged and sorted again in memory by the virtual database before being presented to the application.
此虚拟数据库会协调这些查询在物理数据库上的执行，并会在内存内置后处理各个查询的结果用以准备一个合并结果。
The virtual database coordinates the execution of the queries on the physical databases and post-processes the results of the individual query in memory to prepare a consolidated result.
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.
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)。
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).
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。
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.
数据库同时运行在单个虚拟机上，但是它们并没有被同时访问。
Databases are running simultaneously in the single virtual machine, but they are not accessed simultaneously.
客户端使用一个虚拟ip地址，通过公共网络连接到主系统数据库。
The client connects to the primary database using the public network using a virtual IP address.
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。
Because DB2 II presents a virtual database image of remote data sources, we didn't need to write code for each of these activities.
此区域提供有关IDS数据库提供的各种虚拟处理器的信息。
This section provides information on the various virtual processors as provided by the IDS database.
该应用程序还使用虚拟碎片选项处理将来的数据库可伸缩性需求。
This application also USES he virtual shard option to take care of future database scalability requirements.
数据库服务器在虚拟区中管理内存的分配和解除分配。
The database server manages the allocation and de-allocation of memory in this portion.
为了将此代码片段用作起始构建块，您需要替换虚拟链接、数据库名称和登录信息来反映您自己的环境。
To use this code fragment as a starter building block, you will need to replace the dummy links, database name, and login information to reflect your own environment.
大多数与之竞争的云解决方案都基于托管在虚拟机中的数据库的单一实例。
Most competing cloud solutions are based on single instances of a database hosted within a virtual machine.
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。
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.
HA软件为数据库连接提供一个虚拟ip地址资源。
The HA software provides a virtual IP address resource for database connections.
在从事虚拟团队SA的工作时，我们发现CTP数据库中的某些字段从未进行更新。
While working on the Virtual Team SA, we discovered that some of the fields within the CTP database were never updated.
虚拟处理器对数据库服务器的作用类似于 CPU 对计算机的作用。
The way virtual processors function to database server is similar to the way that a CPU functions in a computer.
如上一节所讨论的，我们创建一个虚拟碎片映射来处理数据库缩放的4个需求。
As discussed in the previous section, we create a virtual shard map for taking care of future requirements of database scaling.
vFabricHyperic——又一个监控组件，关注于操作系统、虚拟机、数据库与应用服务器，面向Web基础设施。
VFabric Hyperic - a second monitoring component which focuses on operating systems, virtual machines, databases and application servers, targeted at web infrastructure.
Sun Microsystems也想能够运行自己的虚拟世界，用以使自己的数据库和用户验证系统相连接。
Sun Microsystems also wanted to be able to run a virtual world that could connect to its own databases and user-verification systems.
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。
Access to heterogeneous databases is provided through requests expressed as queries on a canonical, virtual database.
虚拟区可以通过数据库服务器得到较大扩展，并且可以通过操作系统将虚拟区页移出(page out)磁盘。
The virtual portion is quite expandable by the database server and can be paged out to disk by the operating system.
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