What is the difference between Oracle and MySQL

Hi,
I would like to know the major difference between Oracle and MySQL. I have a project to generate XML files from database tables, i have used oracle's built XML functions XMLELEMENT, XMLATTRIBUTES, XMLFOREST, XMLAGG. I really want to know if these functions (or) similar functions are supported/availabe in MySQL.
I am having a hard time to find out best linux distro for installing Oracle11g, so i am planning to switch to MySQL. Please help, Thanks in advance.

Oracle_Walker wrote:
Hi,
<snip>>
I am having a hard time to find out best linux distro for installing Oracle11g, Then you must be "looking for love in all the wrong places."
What's so hard about finding a "best linux distro for installing Oracle11g"? The supported distros are listed in the fine Installation Guide for Linux. At the top of the list is Oracle's own Oracle Linux, which is in the same family as Red Hat.
so i am planning to switch to MySQL. Please help, Thanks in advance.

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what is the difference between start() and the
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