Recently on a database I enabled trace for event
12842 using the below statement in order to trace Oracle error
ORA-12842 : Invalidated cursor.
alter system set events '12848 trace name ERRORSTACK level 3';
After sometime the error did occur but we could not find any trace file for that event.
I am suspecting the tracing got disabled after instance restart.
Is there any way to list out all the events for which tracing is enabled ?