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。

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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.

数据联合模式的有些实现可以将部分或全部子操作(子查询)以并行方式发送到集成源系统。

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Complexity of the federated query: how many sub-operations such as filtering, joining, sorting, and so on, does the federation server need to execute to perform the query.

联合查询的复杂性：为了执行查询，联合服务器需要执行多少筛选、联接、排序之类的子操作。

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While Carrefour doesn't have sub-Saharan operations, the chain has stores in northern Africa.

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CNN: STORY HIGHLIGHTS