Disabling oracle trace in udump

Is there a way to disable this udump trace files?. I am using oracle 10g and i have set the following in init.ora
sql_trace=false
trace_enabled=false
oracle_trace_enable=FALSE
But still for every connection and query, trace file is getting generated

Maybe it's not instance level setting.. Consider following example:
SQL> SHOW PARAMETER trace
NAME                                 TYPE        VALUE
log_archive_trace                    integer     0
sec_protocol_error_trace_action      string      TRACE
sql_trace                            boolean     FALSE
trace_enabled                        boolean     FALSE
tracefile_identifier                 string
SQL> SELECT spid FROM v$process p, v$session s
  2   WHERE s.paddr = p.addr
  3   AND s.sid = (SELECt sid FROM v$mystat WHERE rownum = 1);
SPID
19935Then I'm checking if my session generates trace files:
[oracle@OEL5 trace]$ ls -la *19935*
ls: *19935*: No such file or directoryNothing.
SQL> exec dbms_session.session_trace_enable(TRUE, TRUE);
Procedura PL/SQL zosta│a zako˝czona pomyťlnie.
SQL> SELECT sysdate FROM dual;
SYSDATE
09/07/14
SQL>
[oracle@OEL5 trace]$ ls -la *19935*
-rw-r----- 1 oracle oinstall 2777 Jul 14 17:13 ORA111_ora_19935.trc
-rw-r----- 1 oracle oinstall  127 Jul 14 17:13 ORA111_ora_19935.trm
[oracle@OEL5 trace]$

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    This article is picked up from www.oracleadvice.com
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    Oracle9i improvements
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    IF you have to give any advice than give it in a proper way I am feeling offended by what you said.Why are you offended? I asked nicely, said "please" and everything.
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    How do i start an Oracle Trace? For a currently running session? How do i read it?

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    Did You enabled session tracing for that particular user?
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