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   ֮ǰ¾É·½·¨ÊÇʹÓà alter session set events ..  »òÕßʹÓÃdbms_system.set_ev·½Ê½
   ʹÓÃdbms_monitor°ü¿ÉÒÔÔڻỰ£¬¿Í»§¶Ë£¬×é¼þÒÔ¼°Êý¾Ý¿âËĸö²ã¼¶¿ªÆôSQLµÄ¸ú×Ù¡£
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   4¸ö²ã´Î¼¶±ðµÄ¼¤»îµ÷Ó÷½·¨£º
    »á »° ¼¶:exec dbms_monitor.session_trace_enable(session_id =>1574,
                        serial_num=>36749,waits=>true,binds=>false);
             ×¢Òâ:ʹÓÃselect *  from v$session where sid=sys_context('userenv','sid');
             »ñµÃsession_idºÍserial
             ¹Ø±ÕÓÃ:
         exec dbms_monitor.session_trace_disable(session_id=>1574,serial_num=>36749)
    ¿Í»§¶Ë¼¶:exec dbms_monitor.cliend_id_trace_enable(
                                 client_id=''JXXXT:Administrator',
                                 waits =>true,binds=>false)
             ×¢Òâ:client_id¼´v$session±íÀïÃæµÄclient_identifier×ֶΣ¬Ä¬ÈÏ´Ë×Ö¶ÎΪ¿Õ,
              ͨ¹ýdba_enabled_traces±í²é¿´ÄÇЩ¿Í»§¶ËÆôÓÃÁËSQL¸ú×Ù
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from tb_Grade 
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