dbmapreduce: 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/dbmapreduce - from package: perl-Fsdb

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

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