dbstats: command not found

Have You tried accessing the binary with the full path?

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/dbstats - from package: perl-Fsdb

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