A good place to start looking for a database is through the UCQ LC page.
Some suggestions:
Is it nursing? Look for a nursing database like CINHAL or MEDLINE.
Is it medical? Then look for a medical database like MEDLINE or Embase.
Is it about education, curriculum or university students? Look for educational databases like ERIC or Academic Search Complete
If you are not familiar with the numerous options available to you, come to the Learning Commons Desk or contact your Librarian to learn more.
Databases are made up of journals. Journals are made up of articles. You want articles, right?
There are thousands of journal titles available through a database. But there is not one database that contains all the hundreds of thousands of journal titles in the world. Journal titles can appear in different databases and that is where repetition can appear.
Do not settle with one database to answer all your questions.
If you have questions on the type of database you should be searching, drop in the Learning Commons or contact your Librarian.