由于数据仓库工作负载的即席性质，这个任务有挑战性。
This can be challenging due to the AD hoc nature of data warehouse workloads.
数据获取是数据仓库系统中最重要也是最困难的任务之一。
In data warehouse system, data extraction is one of the best important and difficult works.
数据获取是数据仓库系统中最重要也是最困难的任务之一。
In data warehouse system, data extraction is one of the best important and difficult works.
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