Unfortunately, the last part of the article is missed and this is created misunderstanding. Even for me is difficult to understand myself. I did sent email to the publisher but has no response. You are right. For the small data warehouses (up to 10G) it is one of the ways to replace data and make very short period of data inavalability.
Ah, I understand now. It will be interesting to see the second part then. It is an interesting topic and great to see what is involved with providing a working solution for this sort of warehousing. Thanks for the article.
Best wishes,
Phil Factor