The federation server forward for each request that it receives sub-operations to source systems.
联合服务器会将其接收到的每个请求的子操作转发到源系统。
2
This impacts the resource utilization at the source systems negatively in that they need to respond to the sub-operations from the federation server.
这将对源系统的资源使用率造成负面影响，因为需要对来自联合服务器的子操作做出响应。
3
Some implementations of the data federation pattern are capable of sending some or all of the sub-operations (sub-queries) in parallel to the integrated source systems.