I don't think there's any general examples available. Test data would imitate the live data you would use in your database. If your database is for recipes, test data would include recipes. If your database was books, test data would include authors, publishers, and book titles ... and so on. If you are testing input, you may need to input the data through your database forms (to test that they work as expected). If you are testing output (reports, analysis) then your test data can be loaded directly to the tables. I don't think test data has to be extremely large per se - just covering the ranges of possible inputs (hit the minimums, maximums, try different kinds of "bad" data such as numbers in bad formats, dates that don't exist, negative quantities, leaving fields blank ... etc.) In other words, try to break the database - input orders without PO's, ship orders without addresses, and so on.