How to manage and prevent database lock for database admin and development

how to manage and prevent database lock for database admin and development
[email protected]

Hi,
can someone advise me some good book or even better a PDF or a white paper on the Web where it's explained well how to design and manage a relational database (that is normal forms, tuning, design, implemantation...)?
I've been working on Oracle databases for a few years as pl sql programmer, but I'd like to read something describing well the relational database theory, because I've been asked to work as database designer.There are many books available in the market, please go through this link -- http://www.amazon.com/gp/bestsellers/books/549646/ref=pd_ts_b_nav
I've been told to read "Fundamentals of Database Systems" by Ramez Elmasri, but I ask here for some more advices.I would strongly recommend reading this book, it was my best reference during my college study and even after starting my DBA career.
Thanks,
Hussein

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