Can I scale out the mysql charm instead of adding another database?

view story

http://askubuntu.com – I have question how to scaling mysql service because I make deployment from here: https://juju.ubuntu.com/docs/user-tutorial.html And I have wordpress and mysql related but is there possible to scale only mysql? When I add-unit mysql I recieve another mysql database instead. And is there possible to write charm where nodes will be share performance? I have server based app(making some calcutaions and recievieng data and send data to clients) in java. Is there possible to scale up this application and make it faster(I mean manage more clients)? (HowTos)