There is not a blanket ban on this sort of question, but you must stay within the guidelines in the faq:
- You should only ask practical, answerable questions based on actual problems that you face
- Your questions should be reasonably scoped.
- If your motivation for asking the question is “I would like to participate in a discussion about ______”, then you should not be asking here
- avoid asking subjective questions where every answer is equally valid: “What’s your favorite ______?”
In practice if your question is specific enough, it will probably be ok, so "What is the best tool to monitor DDL changes on an Oracle database (version 11.2)?" is good, but "What tools are there to monitor changes on databases?" is bad.
Facts like your database version number will likely be provided in the form of tags rather than spelled out in the question title but that is an aside.