cd /var/lib/mysql
sudo mysecretdb
sudo chown -R mysql:mysql mysecretdb

# then I create a veracrypt container:
cd ~
veracrypt -c --encryption=AES --hash=SHA512 --keyfiles="" --pim=1 --password=strongpassword --protect-hidden=no --volume-type=Normal --size=500M --filesystem=FAT mysecretstorage
sudo veracrypt --password=strongpassword -t --keyfiles="" --pim=1 --protect-hidden=no mysecretstorage /var/lib/mysql/mysecretdb

mysql --user=root --database=mysecretdb --execute="CREATE TABLE testtable (col1 INT);" -p

# output:
# Enter password:
# ERROR 1005 (HY000) at line 1: Can't create table `mysecretdb`.`testtable1` (errno: 13 "Permission denied")