Hi Qazi,
Kindly paste the below log DDICUPG.ELG and SAPHA70214.SMD file.
The connection between the oracle and SAP is getting broken frequently.
Just retry the below steps.
Stop SAP and Database
Take a reboot of the server
Start DB , SAP and SUM once again.
Also check the alert_SID.log file for the oracle system.
With Regards
Ashutosh Chaturvedi