Question

例如我从维基百科下载了这个文件

https://dumps.wikimedia.org/other/pageviews/2018/2018-04/pageviews-20180407-130000.gz

在donwload和unzip之后我试图使用外部表返回数据，但是没有返回数据。我意识到（或者我猜）文件中的分隔符是空格char（''）。这是我的代码：

    CREATE TABLE Funcionarios_Externa (
Campo1 VARCHAR2(4000)
,campo2 VARCHAR2(4000)
,campo3 VARCHAR2(4000)
,campo4 VARCHAR2(4000)
,campo5 VARCHAR2(4000)
) ORGANIZATION EXTERNAL (
TYPE ORACLE_LOADER
DEFAULT DIRECTORY DADOS_LOGISTICA
ACCESS PARAMETERS (
RECORDS DELIMITED BY newline
READSIZE 200048576
SKIP 1
FIELDS TERMINATED BY ' ' OPTIONALLY ENCLOSED BY '"'
MISSING FIELD VALUES ARE NULL
)
LOCATION ('pageviews-20170301-000000')
) REJECT LIMIT UNLIMITED;

我不确定我做错了什么。没有错误，只返回数据。

有人能帮助我吗？提前致谢

这是日志文件，没有生成坏文件（我在脚本中添加了坏文件子句

Field Definitions for table FUNCIONARIOS_EXTERNA
  Record format DELIMITED BY NEWLINE
  Data in file has same endianness as the platform
  Rows with all null fields are accepted

  Fields in Data Source: 

    CAMPO1                          CHAR (4000)
      Terminated by " "
      Enclosed by """ and """
      Trim whitespace same as SQL Loader
    CAMPO2                          CHAR (4000)
      Terminated by " "
      Enclosed by """ and """
      Trim whitespace same as SQL Loader
    CAMPO3                          CHAR (4000)
      Terminated by " "
      Enclosed by """ and """
      Trim whitespace same as SQL Loader
    CAMPO4                          CHAR (4000)
      Terminated by " "
      Enclosed by """ and """
      Trim whitespace same as SQL Loader
    CAMPO5                          CHAR (4000)
      Terminated by " "
      Enclosed by """ and """
      Trim whitespace same as SQL Loader

Answer 1

根据要加载的示例文件的链接，我观察到文件没有逗号分隔..它有whitespacce分隔。为了以防万一，我将文件名更改为.txt。然后可以使用sql * developer ..

创建如下的外部表语法

SET DEFINE OFF
--CREATE OR REPLACE DIRECTORY Enter New Dir AS 'M:\extract';
--GRANT READ ON DIRECTORY Enter New Dir TO USER;
--GRANT WRITE ON DIRECTORY Enter New Dir TO USER;
--drop table vijay_ext3;
CREATE TABLE vijay_ext3 
( c1 VARCHAR2(300),
  c2 VARCHAR2(128),
  c3 NUMBER(3),
  c4 NUMBER(3))
ORGANIZATION EXTERNAL
  (  TYPE ORACLE_LOADER
     DEFAULT DIRECTORY DB_DUMP_DIR
     ACCESS PARAMETERS 
       (records delimited BY '\n' 
           DB_DUMP_DIR:'pageviews.bad'
           DB_DUMP_DIR:'pageviews.discard'
           DB_DUMP_DIR:'pageviews.log'
           skip 1 
           fields terminated BY WHITESPACE
           OPTIONALLY ENCLOSED BY '"' AND '"'
           lrtrim
           missing field VALUES are NULL
           ( c1 CHAR(4000),
             c2 CHAR(4000),
             c3 CHAR(4000),
             c4 CHAR(4000)
           )
       )
     LOCATION ('pageviews.txt')
  )
  REJECT LIMIT UNLIMITED;

select * from vijay_ext3 WHERE ROWNUM <= 100;

Answer 2

如果外部表有时工作而不是其他工作，则可能是连接到RAC数据库.. - 为了确保连接到文件所在的实例，需要在tnsnames.ora中添加INSTANCE_NAME。如果您使用的是easyconnect，那么您也可以添加实例名称。例如。 connect vijay / oracle @ // 10.0.10.101:1521/vijay/vijay1

connect username / password @ // hostname：port / service_name / instance_name

如果这不是RAC实例，那么显然问题出在DIRECTORY信息中，因为您在选择或创建过程中存在错误文件或Oracle错误。

Oracle外部表不返回数据

2 个答案: