is "3-4 years experience" a mandatory or nice to have to appear/achieve OCM for 11g
No, Its not mandatory but rather Oracle recommends you to have the same experience, and its just nice to have concept and which can determine that you the enough technical capability to work towards Oracle products.
The answer is in your post.:
It is highly recommended that participants have a minimum of 3 – 4 years of Oracle database administrator experience.
Best of Luck for the exams!!!
Why I am confused is because of last line in section 3 which has a heading of "Required Prerequisites" which states "Candidates should have a minimum of 3 – 4 years of Oracle database administrator experience.".
My confusion is because in the same document, at one location it is with word "recommended" and then again a little later, it states "required".
I am confused between "required" and "recommended".