trace file reuse???

Hello,

    Does anyone know whether its possible to reuse a trace file     in a client session? I've been unable to make this work.

    For example...

        execute dbms_system.set_sql_trace_in_session(10,200,True)


        ...

        ...  run sql commands here

        ...

        execute dbms_system.set_sql_trace_in_session(10,200,False)


    This generates a file named  'myDB_ora_12345.trc'  .  If I
     rename the file to 'Trial1_hold.trc' and rerun the commands again
     the trace file 'myDB_ora_12345.trc' is not created again.  I
     don't understand why the trace package doesn't handle this condition.


     It's a real pain having to reconnect the client to test various query
     scenarios.