Modeling these qualities can be very difficult — even more difficult than the standard quality of performance, which typically addresses the processing and data storage requirements.
对这些质量进行建模是很困难的，甚至比性能的标准质量更困难，后者通常解决处理和数据存储方面的需求。
An example of a tradeoff is between cost and performance: throwing more processing power at the problem will improve performance, but at a cost.
一个折衷的例子就是性能价格比：添加更多的问题处理能力会增加性能，但是要以成本为代价。
This means queries are more AD hoc and not subject to the same performance testing and tuning found in transaction processing systems.
这意味着这些查询更多情况下是临时性的，事务处理系统中的性能测试和调优方法对于它们并不适合。
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