Discuz! Database Error

(23) Out of resources when opening file '.\dpxphoto\forum_forum.MYD' (Errcode: 24)

SELECT fid FROM forum_forum WHERE type='forum' OR type='sub'

PHP Debug

No.	File	Line	Code
1	forum.php	87	discuz_database::query(%s)
2	source/class/discuz/discuz_database.php	136	db_driver_mysql->query(%s, false, false)
3	source/class/db/db_driver_mysql.php	153	db_driver_mysql->halt(%s, %d, %s)
4	source/class/db/db_driver_mysql.php	224	break()