I was always excited to know ,what product would be used by ERP vendors like SAP, Oracle..Finally after long I got the answer atlaest for Oracle, when I found Steve shared some of the information in title "Oracle's Own E-Business Suite Global Single Instance".

• 6 TB of data
• 8 billion rows of data
• 120 organizations
• 431 sets of books
• 340 million GL lines
• 1.1 million customers
• 300,000 vendors
• 40 million AR invoice lines
• 193,000 projects

..what else,This simply make a Oracle proud of there own product, the product that they started for ERP worldd sometime early ninties.

Infact Bret Fuller shared learning experince. You can read the details to the link mention below.
http://www.oracle.com/technology/pub/columns/fuller_global.html
http://www.oracle.com/technology/products/applications/Events/OOW-2005/S1008_Bret_Fuller.pdf