外部表的badfile、discardfile、LOGFILE？解决方法

外部表的badfile、discardfile、LOGFILE？？
drop table ex_test1;

CREATE TABLE ex_test1 (
  "col1" varchar2(20),
  "col2" varchar2(20),
  "col3" varchar2(20),
  "col4" varchar2(20)) ORGANIZATION EXTERNAL (TYPE ORACLE_LOADER DEFAULT DIRECTORY test_dir ACCESS PARAMETERS (
  RECORDS DELIMITED BY '\n' CHARACTERSET ZHS16GBK STRING SIZES ARE IN BYTES READSIZE 10000000
   
  nobadfile  
  nodiscardfile  
  noLOGFILE

  FIELDS TERMINATED BY "," OPTIONALLY ENCLOSED BY'"' LDRTRIM 
  REJECT ROWS WITH ALL NULL FIELDS 
  ( "col1" CHAR(255)
  TERMINATED BY "," OPTIONALLY ENCLOSED BY '"'
  ,"col2" CHAR(255)
  TERMINATED BY "," OPTIONALLY ENCLOSED BY '"'
  ,"col3" CHAR(255)
  TERMINATED BY "," OPTIONALLY ENCLOSED BY '"'
  ,"col4" CHAR(255)
  TERMINATED BY "," OPTIONALLY ENCLOSED BY '"'
  )
  ) LOCATION ('test1.txt')) REJECT LIMIT UNLIMITED PARALLEL;
   
   
  select * from ex_test1;
   
  以上代码执行正常，
问题：
  一旦在“noLOGFILE”的位置替换为“LOGFILE 'ext_test_1.log'”的话，执行 “select * from ex_test1”就报错？
  为啥？
  另外一旦定义badfile\discardfile的话，执行 “select * from ex_test1”也报错，为什么？？？

[解决办法]
我这边没有问题。。
报错的把错误的信息贴出来啊，
我这边到是没有报错

SQL code

CREATE TABLE ex_test1 (  "col1" varchar2(20),  "col2" varchar2(20),  "col3" varchar2(20),  "col4" varchar2(20))   ORGANIZATION EXTERNAL   (TYPE ORACLE_LOADER    DEFAULT DIRECTORY EXT_DIR    ACCESS PARAMETERS   (      RECORDS DELIMITED BY '\n'      CHARACTERSET ZHS16GBK      STRING SIZES ARE IN BYTES READSIZE 10000000    nobadfile       nodiscardfile       LOGFILE '1.log'       FIELDS TERMINATED BY "," OPTIONALLY ENCLOSED BY'"' LDRTRIM REJECT ROWS WITH ALL NULL FIELDS        ( "col1" CHAR(255) TERMINATED BY "," OPTIONALLY ENCLOSED BY '"'      ,"col2" CHAR(255) TERMINATED BY "," OPTIONALLY ENCLOSED BY '"'      ,"col3" CHAR(255) TERMINATED BY "," OPTIONALLY ENCLOSED BY '"'      ,"col4" CHAR(255) TERMINATED BY "," OPTIONALLY ENCLOSED BY '"'      )  )   LOCATION ('test1.txt')  )  REJECT LIMIT UNLIMITED PARALLEL;