Adding separate database server for WebPages

I've heard many people say, thats its best to have 2 servers for busy websites. First of all how busy does it have to be?

Between 10k sessions a day to 15k sessions
15k Sessions - 30k sessions
30k sessions - 50k sessions
50k sessions and above ++

Then once you reach, the point when you need to separate the Html from the database.
What would be the next steps?

Would you first get hold of a server with at least 1-2 gig of memory, for db server(as db servers like memory)

Then install the mysql version that is current and that works for you.
Then import all of the database files and databases.

But then how would you get the db server to communicate with all your different webpages, or is this system only really used for one website. What if your busy website also has a forum, thats not so busy.

 

 

 

 

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