This relates to India offices and experiences could be different in another geography.
At your orientation on joining Oracle. there is a mock exercise, where the trainer plays a quiz by asking "Who is your HR ?".....People immediately respond by naming their BU HR Manager.....The trainer keeps asking this question again, (as obviously the answers provided are wrong).....and keeps repeating the question, till someone responds with , " My reporting manager is my HR manager'..The trainer then tells that , " In Oracle its the manager you report to is your HR Manager'.....This to a wise employees clarifies at the very outset, that (s)he is at the mercy of the reporting manager, and there is no real HR function in Oracle.
In my close to 14 years at Oracle, i never had one direct interaction with my HR executive. In fact many a times (say every 2 years) you learn about your new HR executive when you visit your own profile on the Aria. There is no communication when your new HR is assigned or the previous one gleaves (avg. duration of stay 2 years). The only time I had a direct meeting with a HR was some 9 years back, when a smart HR was conducting some survey, which he could pass off as some work-experience in Oracle for his Resume. ( Else what is their role? considering most of the HR related functions are handled by individual teams or contractors- likes separate ones for recruitment/ negotiation/ training/ retiral benfits/ salary/medical benefits etc.....There is no interaction with your assigned HR at all)
I believe that your BU HR (that is assigned to you on Aria) has only two roles - (1) Conducting exit interviews for an employee who has resigned , and (2) If she is a presentable female, then wearing traditional clothes (sari) and presenting bouquet to a VP level employee visiting India (besides ensuring that the welcome board at the reception says , " Welcome ...Mr. X to IDC/SSI etc.'
Some employees on joining Oracle from other organizations, where HR is a powerful role, make a mistake of opening their heart out to the Oracle HR.....such as complaining about your own manager. in 100% of such cases, I have witnessed the employee being fired in next 30-60 days....If you want answer to the reason, then PLEASE READ THE FIRST PARAGRAPH AGAIN.