Interesting conversation.
Here in my company I have a friend who told me that one of the most experienced DBAs (+10 years) failed the SQL Server 2008 certification on implementation & maintenance. I know it's a different matter because some of the questions focus on new feature or case scenarios that people are not used to but it's something interesting to think about.
I lack too much experience and to me it's harder than lacking too much theory because theory you can learn by yourself. I try to learn the DBA way from what I can by myself but, in practice, it's really hard to emulate an environment like in real life.
I admire you for being humble and accepting that you do not know everything.
We're forever students, it doesn't matter how old we are. 🙂
Best regards,
Andre Guerreiro Neto
Database Analyst
http://www.softplan.com.br
MCITPx1/MCTSx2/MCSE/MCSA