root@server6 [~]# myisamchk --silent /var/lib/mysql/example_com/*.MYI
myisamchk: MyISAM file /var/lib/mysql/example_com/phpbb2_sessions.MYI
myisamchk: warning: 3 clients are using or haven't closed the table properly
myisamchk: error: Size of indexfile is: 191488 Should be: 278528
myisamchk: error: Size of datafile is: 2552 Should be: 119248
myisamchk: error: record delete-link-chain corrupted
myisamchk: error: key delete-link-chain corrupted
MyISAM-table '/var/lib/mysql/example_com/phpbb2_sessions.MYI' is corrupted
Fix it using switch "-r" or "-o"