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。
It is at this stage of design that data access requirements and performance factors need to be considered in some detail.
在设计的这个阶段，就需要较为详细地考虑数据访问需求和性能因素。
Access performance or availability requirements demand centralized data.
访问性能或可用性需求需要集中数据。
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