Thanks a lot Experts for your prompt replies.
As per SAP Note:1738989, i have added the parameter _use_zero_copy_io=false in init<sid>.ora file and restarted the SUM, now i can see logs in /<upgrade_directory>/abap/tmp and /<upgrade_directory>/abap/log directories being generated and as wel as oraarch logs also generated. Last log was at 02:58 PP - IST after that no logs. I have also check for alert.log file under \saptrace directory but couldn't see any alert.log file (under \usertrace and \background.
Expert Please Suggest.
Thanks
Mohd Basis