New to the group and I can't find any posts on [b]when it would be good design to use multiple databases[/b]. I am building a website that will allow access for 3 different types of users: owners, admins, and users. Each of these user types will have their own unique tables and fields. I expect there to be over 10,000 users for each type. Now, I realize that I can just use one database and create a bunch of tables in it, each specific for my 3 user types. And this would be easier for me to program. Conceptually, however, it seems to make better sense to use a different database for each user type. I would like to know if it is better/faster/more resource efficient/etc to use one large database with many tables, or to break it down into 3 databases, one for each user type. Thanks for reading this and your input! Matt