|| what is mysql
please take a look this..

|| how to repair db mysql on linux centos

# /etc/init.d/mysqld stop
# myisamchk -r -q /var/lib/mysql/DB_NAME/*.MYI
# /etc/init.d/mysqld start

|| how to repair table mysql

# /etc/init.d/mysqld stop
# myisamchk -r -q /var/lib/mysql/DB_NAME/TABLE_NAME.MYI
# /etc/init.d/mysqld start

|| links
| google
| thegeekstuff