Rolling back changes

Consider the following:

 1   class UserDB
 2     def adduser(username, password, address, phone)
 3       @phone_db.adduser(username, address, phone)
 4       @system1_db.adduser(username, password)
 5       @system2_db.adduser(username, password)
 6     end
 7   end

Is this exception-safe?