https://naiwaen.debuggingsoft.com/2021/12/db2-%e0%b8%82%e0%b9%89%e0%b8%ad%e0%b8%84%e0%b8%a7%e0%b8%a3%e0%b8%a3%e0%b8%b0%e0%b8%a7%e0%b8%b1%e0%b8%87-db2_standby_isour/