Search notes:

Oracle: DBMS_SYSTEM.SET_EV

This procedure allows to set a diagnost event in another session.
In the special case of the diagnostic event 10046, dbms_system.set_sql_trace_in_session or dbms_support.start_trace can be used. 
dbms_support.set_ev(
  sid,
  serial#,
  event_number,
  event_level,
  event_name
);

See also

Starting a 10046 event with dbms_support.
dbms_system

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