Course Databases are 'spreadsheets' where the items that are learnt in the courses are stored.
'Items' can mean words and definitions, as well as phrases, pictures or audio files.
When you add an individual item to a database using a wiki, Memrise will look for it in our central dictionaries and, if it exists, you can choose to add it to your course's database. If it doesn't exist, you can enter your own item, as well as its definition/translation, one or more audio files to go with it, and images.
It's important to note that databases are unique to each course. They cannot be shared or reused in other courses. Please also note that if you enter new sets of items, or modify the ones that were pre-existent, they will not affect nor be added to our central dictionaries.
The settings of what is displayed and what is tested are done on the levels, not on the database. The database is the store of all of the information about every item in the course. The levels are where those items are arranged by course creators into a learnable format.