In DB2, a federated system is used.
在DB 2中，使用的是联合系统。
Figure 2 shows the federated system configuration.
图2展示了这个联邦系统的配置。
Creating a remote table from the federated system.
从联邦系统上创建远程表。
The federated system provides the SET SERVER OPTION statement.
联邦系统提供SET服务器选项语句。
The basic concepts of an IBM federated system are depicted as follows.
IBM联邦系统的基本概念展示如下。
Figure 3 shows the federated system configuration that follows this step.
图3展示了遵循这个步骤的联邦系统配置。
The server is registered in the federated system by a CREATE server DDL statement.
服务器是通过CREATESERVERddl语句在联邦系统中注册的。
Authentication information is registered with the federated system as user mappings.
身份验证信息以用户映射的形式向联邦系统注册。
In a federated system a server represents a collection of data on the remote data source.
在联邦系统中，服务器表示远程数据源上的一个数据集合。
A nickname is registered in the federated system by a CREATE nickname DDL statement.
别名通过CREATENICKNAMEddl语句在联邦系统中注册。
This indicates to the federated system that you are willing to tolerate stale results.
这样便指示联邦系统，您愿意容忍陈旧的结果。
Also configure the federated system to perform efficient local join and sort operations.
另外还配置联邦系统，以便执行高效的本地连接和排序操作。
The core of the federated system consists of a DB2 instance that operates as a federated server.
联邦系统的核心包括一个作为联邦服务器DB 2实例。
A user mapping is registered in the federated system by a CREATE user mapping DDL statement.
用户映射通过CREATEUSERMAPPINGddl语句在联邦系统中注册。
A federated system communicates with each data source by means of software modules called wrappers.
联邦系统与每个数据源通信是通过称作包装器的软件模块进行的。
The output of the query optimizer on a federated system is the Federated Query Execution Plan (FQEP).
联邦系统上查询优化器的输出是联邦查询执行计划（FederatedQuery Execution Plan，FQEP）。
Provides helpful hints and tips on how to tune the performance of a distributed query in a federated system.
提供关于如何调优联邦系统中一个分布式查询的性能的提示和技巧。
After you register the wrapper libraries with the federated system, register each data source as a server.
在将包装器库注册到联邦系统之后，将每个数据源注册为一个服务器。
Database link Federated system in Oracle, this is an object that describes a path from one database to another.
数据库链接联合系统在Oracle中，这是描述从一个数据库到另一个数据库的路径的对象。
In a federated system with the data partitioning feature, only user-maintained MQTs are supported for nicknames.
在具有数据分区功能的联邦系统中，对于昵称只支持用户维护的MQT。
Informational constraints help improve query performance in a WebSphere Information Integrator federated system.
信息约束有助于提高WebSphereInformation Integrator联邦系统中的查询性能。
With a federated system, you can use a single SQL statement to send distributed requests to multiple data sources.
有了联邦系统，便可以使用一条SQL语句将分布式请求发送到多个数据源。
Most federated system users do not need to tune these three options, as the default values perform relatively well.
大多数联邦系统用户不需要调优这三个选项，因为默认值已经相当好了。
When a primary key constraint is defined, the federated system automatically creates a unique index specification.
当定义一个主键约束时，联邦系统自动创建一个惟一的索引规范。
The administrator of the federated system controls which DB2 users can open a pass-through session to a remote server.
联邦系统的管理员控制哪些DB2用户可以打开到一个远程服务器的 pass-through会话。
Once an application is connected to the federated database, it can access all authorized objects in the federated system.
一旦应用程序连接到联合数据库，就能访问联合数据库中的所有已授权对象。
In this case, a connector SDK gives developers the freedom to integrate additional repositories into II CE's federated system.
在这种情况下，连接器s DK让开发人员能够自由地将其他存储库集成到IICE的联邦系统中。
After the wrapper libraries are registered with the federated system, each data source needs to be registered as a server.
在包装器库用联邦系统注册过后，每个数据源需要被注册为服务器。
Registering each database as a server allows data on each of these remote databases to be accessed from the federated system.
通过将每个数据库注册为一个服务器，可以使这些远程数据库上的数据能够从联邦系统访问到。
The federated system collects statistics for relational nicknames (and some non-relational nicknames) during nickname creation.
联邦系统在创建昵称时收集关系昵称（和一些非关系昵称）的统计信息。
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