Which one should I learn first?

I am becoming an common Oracle DBA and I want to learn RedHat Linux. But I do not know the difference between Redhat Linux 9 and Redhat Enterprise Linux 5. What are they for? Which one should I learn first?
Message was edited by:
frank.qian

But I do not know the difference between Redhat Linux 9 and Redhat Enterprise Linux 5.RedHat Linux 9 is very oldest brother of RHEL5. While RH9 is public (free of charge) distribution, RHEL5 is commercial no free (of charge) distribution. Redhat 9 was last public (free) release from Redhat corporation, since next release it was called Fedora. Name "Redhat" is used only for Commercial enterpise distribution.
There is not difference between using/mantaining of them. But the main difference is that Redhat 9 has pretty old version of kernel, and other packages and is not supported by Oracle.
What are they for?If we are speaking about Linux then we are speaking about Unix like operating system. So your question is just like "What is Windows for?".
Which one should I learn first?As I said before, there is not difference between using/mantaining of them. But as Redhat 9 is pretty old distribution then use RHEL5. There is also existing distribution Centos which is clone of RHEL. When you install Centos 5 in fact you are using RHEL but with changed logos and texts (brands). But unfortunatelly this clone is not officialy supported by Oracle so it can't be use for production Oracle installations. For more informations and download look here: http://www.centos.org
There is also another RHEL clone shipped by Oracle (and is supported by Oracle of course). You can download it from http://edelivery.oracle.com/linux

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