redland-db-upgrade: 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/redland-db-upgrade - from package: redland

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

On Debian possible default full paths are:

/usr/bin/redland-db-upgrade - from package: redland-utils

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

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