Oracle in RHEL 5. Which one to learn first? Linux or Oracle?

My office uses Oracle Database in RHEL 5. Which one should I master first to be a qualified DBA? the Linux or Oracle? If the answer's Linux, where can I find Linux Tutorial for Dummies since I've never handled Linux in my life before. thanks

Both.
Best way to start is install a VM on your computer and download a Live distribution (Ubuntu, Fedora Core, etc...), install it. While you are playing around with linux in your VM, install oracle on your windows system and start playing around there. The only real difference you will encounter when playing around with the basics of oracle is the path reference to files. It may seem hard to get started but once have gotten to the point where you know enough to install oracle under linux (install apps via YUM or RPM, change configuration, install other daemons or services; IE: postfix, samba, smtp, etc) and know about creating users, creating tablespaces, creating tables/procedures/packages, altering system parameters, creating database links, etc...you will be on your way.
However becoming a DBA is not as simple as just knowing about Linux and Oracle. Since you have not indicated what you do know about this area I will assume a few things. First off when you start working as a DBA, you may not be just running Oracle on Linux, you may be running oracle on HP-UX, AIX, Linux, Solaris, Windows. Plus you will also be expected to know about writing quieries and optimizing queries. There is no magic settings that make databases run fast, you have to know about how they work, how queires are executed by the sql parser (this is where the real performance gains are).
One thing that I have been constantly expected to know (with detail) is oracle licensing. This is a nightmare, and it takes a while to learn about how all the licensing works so you can give advise for new projects that want to use certain technologies from oracle. This is very daunting at first, but as you learn about everything and become more comfortable about using and knowing all of this stuff it will become second nature to you. If you know DBA's (work colleagues or friends) talk to them, get them to show you, you will learn a lot more in less time than learning by yourself.

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