轮流连接到每台机器的远程注册表。
上图显示了在连接表实现中用相同数量的远程调用（即 4 个）来检索整个购物车。
The figure shows that the same number of remote calls, namely four, is used to retrieve the entire shopping cart as in the joined-tables implementation.
脚本 host.sql 包含一些 SQL 语句，这些语句使用联邦建立到一个远程 DB2 for z/OS 子系统的连接，并通过昵称访问三个含空间数据的远程表。
The script host.sql contains SQL statements that use federation to establish the connection to a remote DB2 for z/OS subsystem and to access three remote tables with spatial data through nicknames.
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