Service application database 2010 migration to 2013

If we want to migrate e.g. only Managed metadata service application database from 2010 to 2013 environment what will be exact steps?
(I know for content db we have to use Powershell Mount command). 
But I guess in case of service application databases Mount command will not work, Can any one say if it true or not? 
What are the  steps involved to migrate such service application databases through Powershell?