What MariaDB-container are you running? Updated? If MariaDB 10.3 or later you only need innodb_file_per_table=1 in custom.cnf   Look at the instructions again: The instructions for MariaDB 10.3 OR LATER tells you: Make sure that you have innodb_file_per_table=1 in your /appdata/mariadb/custom.cnf It then tells you to "Continue at step 2 of the MySQL instructions." Step 2 of the MySQL instructions: Change your databases character set and collation: ALTER DATABASE
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