db_replicate: 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/bin/db_replicate - from package: db-util

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

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