Operational Database Account - Run As Profile

Hi

Hopefully this one will be a quick one! I'm running SCOM 2012 R2, and I can see that we have a Run As profile named 'Operational Database Account' but it's blank i.e. no account is specified. Therefore, I'm asking two questions:

1) Should the profile in fact have an account listed?

2) If so, what should be listed, Data Access Account??

Thanks, David.