eBay has been a very successful and popular online retailer, in large part because of its prowess with data-base management.

As reported by the W. P. Carey School of Business at Arizona State University: “Few companies generate as much data as the online auction and shopping Web site eBay. Each time a user searches for a product, bids on an item, or navigates to or away from the site, the company collects information about the user interaction. Every day, the amount of data eBay processes adds up to an astonishing 50 petabytes—or 50 quadrillion bytes.”

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