1. Use this command display dpi data-server to check the dpi data server status.
2. Use /etc/init.d/dpiserver status to check all kinds of dpi server status.
3. Net step we check the reason the oracle failure and get mgmt-0 and mgmt-1 messages，it show us that the sig end back link the database failure between Oct 31 09:43:59 and Oct 31 09:51:06.
4. And then check the oracle log again, the Oracle sigdb-1 force to logout at Oct 31 09:50:23，Oracle db-2 force to logout at Oct 31 09:51:27. It results that the both database are unusefull.
5. According to the conclusion, the engineer should restart the mgmt-0 and mgmt-1 slave server.