oar-database: 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/oar-database - from package: oar-server

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

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