Should I search more than one database? Depending upon what you're looking for, YES. Although there's overlap, all publications aren't in every database, e.g. Harvard Business Review is in Business Source & Sloan Managment Review is in ABI/Inform. If you don't want to miss something, search more than one.
What types of articles are you looking for?
General Business & Trade Publications:
Specialized Subject Databases:
Full text is available for most articles in these databases, look for the "full-text" or "pdf" links.
If there is no full-text, look for the button. This will link you to a copy of the article in another database, or help you request it though interlibrary loan: