Since databases are related to plugin development, I'd like to ask some questions? How long is the result of Player::getSkinData() (to save it in a DB)? When a row has 100 columns, will it take longer to fetch a single column compared to a 5 columns row? Should MySQLi only be queried in an AsyncTask? Is it good to store all the queried data of a user in an array? The user gets removed when he quits, which will make the array length less than the server maximum players, as example 40 players. I would upload the array data of a player when a player leaves. Would that method be good for performance? And last question: I plan to add auto login by clientId, I want to login the player by IP address too, but is this insecure when as example a friend is in the players WLAN? What are other ways to recognize a player?