Tracing a session with known SID
exec dbms_system.set_sql_trace_in_session(sid,serial#,true)
exec dbms_system.set_sql_trace_in_session(63,19586,true)
exec dbms_system.set_sql_trace_in_session(sid,serial#,true)
exec dbms_system.set_sql_trace_in_session(63,19586,true)