does anyone knows if this exam can be taken online, or at all ? When pressing 'Register for this exam' at 'Oracle Certification Program: Oracle Technology and Applications Certification ' I'm directed to a general page for exam-registration, but I cannot find the exam at i.e. Pearson VUE. I'm not able to find the exam at 'Oracle University' either.
I'm not really sure what you mean by "find the exam at 'Oracle University' " The exam information page is at the following URL, but that's not where you would schedule the test. The link to that page follows:
I logged in to Pearson Vue and found the 1Z0-591 exam without a problem. If I had any desire (and sufficient knowledge in BI), I could have scheduled it. The exam is there. I can't give you a link to that because it requires logging in.
... aren't on-line exams common ?
No, almost all of them are proctored. On-line exams are frankly just too easy to cheat on. The certification would mean very little if most of the exams were available on-line. This is not to imply that you would, but it is certain that many people would take advantage.