At which stage of the ETL should data be profiled?简述应该在ETL的哪个步骤来实现概况分析？
At which stage of the ETL should data be profiled?
简述应该在ETL的哪个步骤来实现概况分析？
相关考题：
Name the three fundamental fact grains and describe an ETL approach for each.简述三种基本事实表，并说明ETL的过程中如何处理它们。
What steps do you take to determine the bottleneck of a slow running ETL process?如果ETL进程运行较慢，需要分哪几步去找到ETL系统的瓶颈问题。
Explain the different real-time approaches and how they can be applied in different business scenarios.简述几种不同的实时ETL实现方法以及它们的适用范围。
Outline some challenges faced by real-time ETL and describe how to overcome them.简述实时ETL的一些难点及其解决办法。
以下哪个行为不是ETL的一部分。 （）A．抽取B．转换C．加载D．清洗