Large databases usually require powerful hardware to run. Professionals, who can design nontrivial solutions in all areas – architecture, availability, maintenance, performance tuning, to name just a few. You need to have highly skilled professionals in the team. Those databases are more expensive to support and maintain. The problem, however, is that the large databases are not good for the customers.
Customers usually understand amount of work involved in such projects. Last but not least, customers with multi-terabyte databases do not have problems with multi-kilodollar invoices. They are fun to deal with they give you priceless experience and look cool in your resume. As the database professional, I like multi-terabyte databases.
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