In this article, the focus is on index matching rather than the optimizer's index selection. 本文专注于索引匹配(IM),而不是优化器的索引选择。
Index matching is usually trivial in the relational case. 在关系查询中,索引匹配(IM)通常是微不足道的。
This process is known as " index matching " and produces a ( possibly empty ) set of eligible indexes for the given query. 该过程被称为“索引匹配(IM)”,并且为给定的查询生成一组合适的索引(可能是空集)。
However, there is a lot you can do to ensure index matching. 但您可以采取许多其他措施确保索引匹配(IM)。
With the measuring system equipped with a microchip solid laser and a unique refractive index matching cladding mode filter, the transmission loss of a double clad fiber laser was measured. 利用固体微晶片激光器作为光源输出,建立了折射率匹配法传输特性测试仪实验装置,对掺镱双包层光纤的传输损耗特性进行了测量。