The users are complaining that the oracle apps is hanging even if few users are only using like 4 users, and sometimes even no one is using it... so weird. Can this
be caused by concurrent batch scheduled jobs running background?
It could be, and this depends on what concurrent programs are running.
How can I list all the concurrent jobs currently running?
Query FND_CONCURRENT_REQUESTS -- http://etrm.oracle.com/pls/trm11510/etrm_pnav.show_object?c_name=FND_CONCURRENT_REQUESTS&c_owner=APPLSYS&c_type=TABLE
Concurrent Processing - What are the Meaning of the Codes in the STATUS_CODE and PHASE_CODE Columns of FND_CONCURRENT_REQUESTS Table? [ID 152209.1]