D. Calculate the cost performance index.
计算成本绩效指数。
A useful cost indicator is the cost Performance Index (CPI) shown in Figure 6. Like the SPI, the CPI is calculated.
一个有用的成本指示器是成本执行索引(CPI)，如图6所示，CPI是被计算出来的。
From the performance perspective, this is considered a very efficient join operation, because the cost for scanning the inner table is optimal via unique access through a unique index.
从性能的角度来看，这被认为是一个非常有效的联接操作，因为通过贯穿唯一索引的唯一访问扫描内部表的成本是最优的。
As the number of indexes on a table grows, eventually the aggregate CPU cost of maintaining the indexes can outweigh whatever performance gains a new index might deliver.
随着一个表上的索引数量的增加，维护索引的CPU总成本最终可能会超过新索引提供的性能收益。
The experimental results prove that it can make a proper log region allocation, efficiently improve search performance, and reduce non-clustered index update cost.
实验证明，该方法能够自适应地划分合理的日志区空间，有效提高查询性能，减少各种非聚集索引的更新代价。
Network efficiency is a major index for the evaluation of network performance, which reflects the target effect produced by unit management cost within a certain period.
网络的功效评价是网络性能的重要指标之一，它表示一定时期内单位管理成本所产生的目标效果。
The utility model has the advantages of small volume, copper and iron saving, low loss, low noise, low cost, good index of performance, etc.
本实用新型的优点是，体积小，节省铜铁，低损耗，低噪声，成本低，性能指标好等。
The utility model has the advantages of small volume, copper and iron saving, low loss, low noise, low cost, good index of performance, etc.
本实用新型的优点是，体积小，节省铜铁，低损耗，低噪声，成本低，性能指标好等。
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