I've been working with relational database systems for about 4 years, 2 years in Oracle particularly. I've been able to do pretty much everything I've needed so far but I know that the knowledge I have in Oracle is like a drop of water in ocean. I'm sure that I'm not aware of or don't use many features that Oracle has or don't use them properly. To be short, I think my knowledge is not enough for professional database development/administration. So I've decided to learn Oracle real deep. I am interested in getting certificates but not as much as I want to learn it really well. Is there anything that I have to know in advance? I think there're quite a bit of things in Oracle that are the same in all RDBMS's, that is fundamental concepts. Any suggestions on useful course(s) or book(s) would be appreciated.
closed as off topic by FreshPhilOfSO, Martin Smith, Mark Storey-Smith, RolandoMySQLDBA, Max Vernon Apr 8 '13 at 16:15
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Read the Oracle Concepts manual from (virtual) cover to (virtual) cover.
The latest version is at http://docs.oracle.com/cd/E11882_01/server.112/e25789/toc.htm
If you know and understand all of this you'll be in the top 1% of all DBAs.