Database Manage

Database Manage
I have a comunity site with 200000 user.the database of site is mysql and it has size about 600mb is very slow now,and i think because of database size..I wanna change completly form of database..but i need some info befor
which kind of database ,big comunity site using ,like facebook?
dose any member has separtae database,or for every new member will make a new database?
i wanna know how a site like facebook with so many content and member save member info in database?because if thay want save all info in one database ,the size of database will be very big..

so i need change king of my datase base..
if you are professonal in this job ,please let me know about my question and explain how you can solve this problem.

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