bdb: 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/bdb - from package: bigloo

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

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