SSO on vCenter Appliance

hi guys

does the SSO database needs to be configure in the vcenter appliance to make it work?

I see this

http://screencast.com/t/H5WCftADfpO

and this

http://screencast.com/t/fKmEe0mxL

do I need to configure that?

since I see the SSO option to nbe configure

http://screencast.com/t/GfKgbJvthP

any idea thanks a lot