mk-table-checksum: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/mk-table-checksum - from package: maatkit

You may install the required package with command yum install {package}

Error in other languages:
mk-table-checksum: bevel nie gevind nie
mk-table-checksum: comandă negăsită
mk-table-checksum: comando não encontrado
mk-table-checksum: commande introuvable
mk-table-checksum: command not found
mk-table-checksum: käsku ei ole
mk-table-checksum: không tìm thấy lệnh
mk-table-checksum: komanda nerasta
mk-table-checksum: Kommando nicht gefunden.
mk-table-checksum: kommandot finns inte
mk-table-checksum: komut yok
mk-table-checksum: nie znaleziono polecenia
mk-table-checksum: níor aimsíodh an t-ordú
mk-table-checksum: no se encontró la orden
mk-table-checksum: no s'ha trobat l'ordre
mk-table-checksum: opdracht niet gevonden
mk-table-checksum: parancs nem található
mk-table-checksum: perintah tidak ditemukan
mk-table-checksum: príkaz nenájdený
mk-table-checksum: příkaz nenalezen
mk-table-checksum: команда не найдена
mk-table-checksum: командата не е открита
mk-table-checksum: 命令找不到
mk-table-checksum: コマンドが見つかりません