What's the 'must' handbooks for DBAs?

Hi,
I'm going to working as a professional dba. I've been working on this from time to time for about 4 yours, and now besides experience, i think it's time to build up the systematical skills. So what do you think are the 'must' handbooks for professional DBAs? I mean for backup&recovery, db admin, performance tuning, etc.
Good luck!
eilison
[email protected]

'Getting started' shows the most commonly used DBA books from Oracle.Thanks for input, but I'm not a beginner to oracle.You do not have to be a beginner dba to read the oracle supplied documentation. I have read most of it (believe it or not), and still need it almost daily.
Yesterday I learned for exemple the very helpful FOLD_AFTER option in the sqlplus manual, which will help you to generate ddl statements...
Regards
Laurent

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