number of concurrent processes per user-ID
 

I need to know how can i find out "number of concurrent processes runnig per user-ID " including threads for any user . I know we can limit this value in limit.conf or ulimit -u . Actually , my limit is set as 2048 for oracle user , but when i do ps -efl -u oracle | wc -l , only get 101 .

You can grep through the output of ps and then use wc, as you've shown. I'm not sure what the problem is, since a user can always be running fewer processes than his or her limit.

Thanks for your response !!

Problem is users are not able to make connections ( not logon ) to the system , saying can't fork new process , and when i check number of processes running from oracle it is way below the limit .