http://go.microsoft.com/fwlink/p/?LinkId=271932 >> Microsoft SharePoint Server 2013 architecture
look like sharepoint2013 database have extra a lot database is created for the service application database. Look cool , need to take sometime to understand again.
so far I can recognized one is about the system database only , I have leaving far away from sharepoint2013 since my working place still remain at sharepoint2007.
hope this year I can play around with sharepoint2013 soon and get chance to attend some formal training on it and get certified for it.