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.
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closed as off topic by Phil, 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.