querying smi tables

I am trying to put together some views that DBA could use to look at performance statistics (i.e. cache hit ratio,# of seq scans, etc...), db growth stats (i.e. total space allocated, used and free) and user stats (i.e. concurrent users and max users). Does anyone have some examples or can someone point me to a place where examples of these types of requests reside? I know I am asking a lot here. Thanks in advance!! fitr Sent via Deja.com http://www.deja.com/ Before you buy.