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    1. cd [ORACLE_HOME]/rdbms/admin
    2. log into SQL*Plus as SYSTEM
    3. Run @utlxplan
    4. Run CREATE PUBLIC SYNONYM PLAN_TABLE FOR PLAN_TABLE;
    5. Run GRANT ALL ON PLAN_TABLE TO PUBLIC;   £¨±¾¾ä¿ÉÒÔ¸³¸øÌض¨µÄÓû§¡££©
  
  ÏÂÃæ²½ÖèÊÇ´´½¨ºÍ¸³plustrace ½ÇÉ«
   1. cd [ORACLE_HOME]/sqlplus/admin
   2. Log in to SQL*Plus as SYS or as SYSDBA
   3. Run @plustrce
   4. Run GRANT PLUSTRACE TO PUBLIC;  £¨±¾»ú¿ÉÒÔ¸³¸øÌض¨Óû§£©
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CREATE TABLE  A_MINUS_B  AS              ---´´½¨Ò»¸ö²î¼¯±íA_MINUS_B ,×¢ÒâSELECT Óï¾äÒ»¶¨ÒªA±íÔÚǰ¡ ......
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