This really is a question, I don't know
It's my understanding most if not all mmorpgs have identical replicas for each server/realm, including the environment and creatures.
The only thing missing are the players and their inventory.
But with Ashes of Creation their will be constant change in it's environment........ How will this be stored in each realms database memory ?
Sounds like a lot of work, hardware and up-keep.
MY friend at work downloaded a Vanilla World of Warcraft emulator. This emulator came with the entire stagnate world that included all the creatures. He was able to manipulate creatures damage and drops, his own characters armor and weapons and inventory, but NOT THE ENVIRONMENT, that was fixed. He could never get the game to work online to allow friends, but that's besides the point.
The point is the world was a fixed copy..... Easy to make copies for multiple realms/ servers. How will this work with an ever changing environment ?
Seems to me most mmoprgs, characters and inventory are the only thing needed in a database.