How many client can chat (one-to-one) at concurrent time with openfire and mysql database(if we also save all messages in database)?

Openfire Plugins
1

Hello there,
I m new in openfire and working on a android chat app. I have some question and want you please help me.

  1. How many clients can chat on concurrent time (one-to-one chat) with mysql database and i want to store all messages in my mysql db also.
  2. can i have some features in my app like typing status and online status with opnefire?

Thank you