mysql> drop database foodb;
ERROR 1010 (HY000): Error dropping database (can't rmdir './foodb', errno: 39)

# cd /var/lib/mysql           <- Mysql이 설치되어 있는 경로로 이동한다.
var/lib/mysql# ls
foodb
/var/lib/mysql# rm -fr foodb
mysql> drop database foodb;
ERROR 1008 (HY000): Can't drop database 'foodb'; database doesn't exist
mysql> create database foodb;
Query OK, 1 row affected (0.00 sec)
mysql> drop database foodb;
Query OK, 0 rows affected (3.38 sec