If there is a problem with the data table, you can use the --recover --quick parameters to do the repair work:
linux#myisamchk --recover --quick tbl_name
linux#isamchk --recover --quick tbl_name
if If the above method does not solve the problem, you can remove the --quick parameter:
linux#myisamchk --recover tbl_name
linux#isamchk --recover tbl_name
If the problem still cannot be solved, you can try again. --safe_recover parameters:
linux#myisamchk --safe_recover --quick tbl_name
linux#isamchk --safe_recover --quick tbl_name