You can try the following commands:
First, stop MySQL
/etc/rc.d/init.d/mysql stop
Repair all SQL databases:
myisamchk -r /var/lib/mysql/*/*.MYI
Start mysql again:
/etc/rc.d/init.d/mysql start
If it does not work, could in the following way
mysqlcheck –all-databases -r #repair
mysqlcheck –all-databases -a #analyze
mysqlcheck –all-databases -o #optimize
That's it !!