I'm upgrading from Magento CE (1.9.x.x) to Magento EE. How can I migrate the database? My major concern is with moving Customers, Orders, Products & Categories. I do not wish to use any additional "paid" extensions for migration of data.
I assume that you update to the equivalent EE version 1.14.x.x. Then there is nothing to "move". Magento Enterprise is a set of additional modules:
app +-code +-core +-Mage <-- same for CE 1.9 and EE 1.14 +-Enterprise <-- additional code of EE 1.14
So the upgrade to EE is similar to installing a bunch of extensions. You can keep your database and the setup scripts of the Enterprise modules will change anything that's necessary.