How to view what session is causing heavy load

Hi,
currently I was tasked to view what is wrong with the production server, there's some processing that is causing heavy usage.
May I know how should I go about investigating this?
thanks
more precisely which machine, which sid, what query is causing heavy load on the db server?
thanks

Hi,
Better generate and statspack/AWR and analyse the report to find queries which are causing heavy load for the time period in which database consuming high CPU. You can use top command from OS level to check the process are consuming heavy load.
HTH
regards
Jafar

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