The only difference between large and small databases is the total number of players that can be bought and sold, i.e. the number of players with white names. If you have a machine with a good configuration, it is recommended to use the large database. If you have more than one league, you can use the medium one if you have a good machine, or the large one if you have a good machine.

For example, the English Premier League. Choose to coach only the Premier League! Open a small database! Can you play the FA Cup in the Championship

British League and other small clubs! Can't play the League Cup!

This is such a low level question that my answer above seems to have addressed it.

It's not a nobody team, it's an all-grey team. That's pretty much normal.

Large and small databases have no effect on current league personnel, meaning that if you have the Premier League on, all the players in the Premier League must be there, even if it's a small database.

The official explanation of the databases is that they are small databases, which show the players of the current league as well as world-renowned players.

Medium database can show players from this league and more well-known players from the world

Large database can show players from this league and most of the players from the world