About DBMS_SYSTEM package

HI, every one.
Environment Oracle9.2
I just want to use DBMS_SYSTEM.set_ev,
when I called
dbms_system.set_ev(9, 437, 10046, 8, 'scott')
successful,
but no .trc file genterated.
Why?

I came across one of the author saying that oradebug and set_env generally should not be usedWell, of course ORADEBUG is also undocumented, which is a synonym for "not to be used".
I think SET_EV is more useful than SET_SQL_TRACE_IN_SESSION because you can get the waits. Obviously it's more dangerous as it also allows you to set the wrong event.
Once again thanks for correction Actually I wouldn't have picked you up on it if I hadn't have seen the possibility of a joke in oradebut.
Cheers, APC

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-rw-r-----   1 oraptsap   dba           2494 Jul 21 12:45 ora_21730_ptmsap.trc
-rw-r-----   1 oraptsap   dba           3062 Jul 21 12:53 ora_22736_ptmsap.trc
-rw-r-----   1 oraptsap   dba           4988 Jul 21 13:01 ora_23791_ptmsap.trc
-rw-r-----   1 oraptsap   dba           4378 Jul 21 13:10 ora_24901_ptmsap.trc
-rw-r-----   1 oraptsap   dba          12146 Jul 21 13:20 ora_26277_ptmsap.trc
-rw-r-----   1 oraptsap   dba           3315 Jul 21 13:30 ora_27270_ptmsap.trc
-rw-r-----   1 oraptsap   dba           3314 Jul 21 13:38 ora_28622_ptmsap.trc
-rw-r-----   1 oraptsap   dba            822 Jul 21 13:45 ora_29712_ptmsap.trc
-rw-r-----   1 oraptsap   dba           3300 Jul 21 13:54 ora_804_ptmsap.trc
-rw-r-----   1 oraptsap   dba           4949 Jul 21 14:01 ora_1985_ptmsap.trc
14:07:38 SQL> EXECUTE dbms_system.set_sql_trace_in_session (41, 61052, TRUE);
PL/SQL procedure successfully completed.
14:07:46 SQL> !ls -ltr | tail
-rw-r-----   1 oraptsap   dba           2494 Jul 21 12:45 ora_21730_ptmsap.trc
-rw-r-----   1 oraptsap   dba           3062 Jul 21 12:53 ora_22736_ptmsap.trc
-rw-r-----   1 oraptsap   dba           4988 Jul 21 13:01 ora_23791_ptmsap.trc
-rw-r-----   1 oraptsap   dba           4378 Jul 21 13:10 ora_24901_ptmsap.trc
-rw-r-----   1 oraptsap   dba          12146 Jul 21 13:20 ora_26277_ptmsap.trc
-rw-r-----   1 oraptsap   dba           3315 Jul 21 13:30 ora_27270_ptmsap.trc
-rw-r-----   1 oraptsap   dba           3314 Jul 21 13:38 ora_28622_ptmsap.trc
-rw-r-----   1 oraptsap   dba            822 Jul 21 13:45 ora_29712_ptmsap.trc
-rw-r-----   1 oraptsap   dba           3300 Jul 21 13:54 ora_804_ptmsap.trc
-rw-r-----   1 oraptsap   dba           4949 Jul 21 14:01 ora_1985_ptmsap.trc
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14:09:38 SQL> !ls -ltr | tail
-rw-r-----   1 oraptsap   dba           2494 Jul 21 12:45 ora_21730_ptmsap.trc
-rw-r-----   1 oraptsap   dba           3062 Jul 21 12:53 ora_22736_ptmsap.trc
-rw-r-----   1 oraptsap   dba           4988 Jul 21 13:01 ora_23791_ptmsap.trc
-rw-r-----   1 oraptsap   dba           4378 Jul 21 13:10 ora_24901_ptmsap.trc
-rw-r-----   1 oraptsap   dba          12146 Jul 21 13:20 ora_26277_ptmsap.trc
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-rw-r-----   1 oraptsap   dba            822 Jul 21 13:45 ora_29712_ptmsap.trc
-rw-r-----   1 oraptsap   dba           3300 Jul 21 13:54 ora_804_ptmsap.trc
-rw-r-----   1 oraptsap   dba           4949 Jul 21 14:01 ora_1985_ptmsap.trc

SQL> select sid, serial# from sys.v_$session where ...
SID SERIAL#
1 12
Enable tracing for your selected process:
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Ask user to run just the necessary to demonstrate his problem.
Disable tracing for your selected process:
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Look for trace file in USER_DUMP_DEST:
If you don't know your USER_DUMP_DEST.
look for system parameter
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KR.

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About DBMS_SYSTEM package

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