N-tier architectures rely on the interoperation of multiple computer systems, each of which has its own performance considerations depending on the types of services that it provides.
n层架构依赖于多个计算机系统的相互操作，根据所提供的服务的类型，每个计算机系统具有不同的性能考虑因素。
The query optimizer might come up with a different query execution plan tailored to provide good performance for fast retrieval of first 'n' rows rather than all the result rows.
查询优化器可能得出一个不同的查询执行计划，这个计划可以专门为最快地获取前' N '行，而不是所有结果行提供良好的性能。
Combining the Parallel Job Manager (PJM), N-tier caching structures, and affinity routing provides a powerful, high-performance compute grid.
组合使用并行作业管理器(PJM)、n层缓存结构和关联路由，可以提供功能强大的高性能计算网格。
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