Selecting the most appropriate databases is an important step in your research process.
The Library provides access to a number of research databases that aim to index a broad range of publications across each research / discipline area, and from many different publishers. You will need to search a number of databases to make sure that you've covered the topic fully.
If your research spans multiple disciplines, you will need to look at the lists of databases for each of these disciplines. If you are researching nursing, for example, you will need the list of nursing databases, but you might also need the psychology databases depending on your research question.
Your lecturer or supervisor should also be able to recommend key databases for you to search.