verify-db: 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 Debian possible default full paths are:

/usr/sbin/verify-db - from package: 389-ds-base

You may install the required package with command apt-get install {package}

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