dltest: 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/dltest - from package: unixODBC

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

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