Client resource index caching mechanism and the iterative query forward mechanism are adopted in the system design to enhance the search efficiency and success ratio.
系统采用客户资源索引缓存机制和“迭代深入”的查询转发机制，提高了搜索的效率和成功率。
Among all queries sent to DNS, the proportion of iterative query is larger than 30%, so the performance of server selection algorithm directly affects the performance of a DNS server.
在DNS中的所有查询请求中，迭代查询所占的比例大于30%，因此服务器选择算法的性能对整个DNS服务器的整体性能有着非常大的影响。
Indeed, preserving our original query semantics while providing for reasonable performance often required iterative design, coding, and testing.
实际上，为了在提供合理性能的同时保留初始的查询语义，我们需要反复地设计、编码和测试。
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