How to query an external table?

hi,
Can anyone help me, I created an external table but I cannot query the table... I encountered the error SQL Error: ORA-29913: error in executing ODCIEXTTABLEOPEN callout...
Attached my SQL for your reference:
CREATE OR REPLACE DIRECTORY dat_dir AS 'pos_file';
CREATE OR REPLACE DIRECTORY log_dir AS '//10.101.21.175/pos_file/Log';
CREATE OR REPLACE DIRECTORY bad_dir AS '//10.101.21.175/pos_file/Bad';
CREATE TABLE revext (person VARCHAR2(20),
rev_jan NUMBER(4),
rev_feb NUMBER(4),
rev_mar NUMBER(4),
rev_apr NUMBER(4),
rev_mai NUMBER(4),
rev_jun NUMBER(4),
rev_jul NUMBER(4),
rev_aug NUMBER(4),
rev_sep NUMBER(4),
rev_oct NUMBER(4),
rev_nov NUMBER(4),
rev_dez NUMBER(4))
ORGANIZATION EXTERNAL
TYPE ORACLE_LOADER
DEFAULT DIRECTORY dat_dir
ACCESS PARAMETERS
records delimited by newline
fields terminated by ','
( person,
rev_jan,
rev_feb,
rev_mar,
rev_apr,
rev_mai,
rev_jun,
rev_jul,
rev_aug,
rev_sep,
rev_oct,
rev_nov,
rev_dez
LOCATION ('revext.dat')
Thank you,
Dexter

Hi! Thanks for your immediate response...
Here's the complete error when I tried to query the created external table.
Error starting at line 48 in command:
select * FROM revext
Error report:
SQL Error: ORA-29913: error in executing ODCIEXTTABLEOPEN callout
ORA-29400: data cartridge error
error opening file pos_file/REVEXT_18225.log
29913. 00000 - "error in executing %s callout"
*Cause: The execution of the specified callout caused an error.
*Action: Examine the error messages take appropriate action.

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Flakey model.
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6         START WITH parent_des_id IS NULL
7         CONNECT BY PRIOR des_id = parent_des_id) de,
8        (SELECT CONNECT_BY_ROOT (name) root_dac_code, name dac_code
9         FROM   data_categories
10         START WITH parent_dac_code IS NULL
11         CONNECT BY PRIOR dac_code = parent_dac_code) dc
12 WHERE de.parent_dac_code = dc.dac_code
13 ORDER BY dc.root_dac_code, de.des_id, de.display_seq;
ROOT_DAC_CODE PARENT_DAC_CODE   DES_LEVEL DES_ID NAME
ASSESS         OBSERVE                   1    210 INPUT
MANAGEMENT     MEDICATION                1    100 DOSE
MANAGEMENT     MEDICATION                2    110 1MG
MANAGEMENT     MEDICATION                2    120 2MG
MANAGEMENT     MEDICATION                2    130 3MG
MANAGEMENT     MEDICATION                1    140 ROUTE
MANAGEMENT     MEDICATION                2    150 ET
MANAGEMENT     MEDICATION                2    160 EM
MANAGEMENT     MEDICATION                1    170 RESPONSE
MANAGEMENT     MEDICATION                2    180 IMPROVED
MANAGEMENT     MEDICATION                2    190 NOCHANGE
MANAGEMENT     MANAGEMENT                1    200 FILED
12 rows selected.
SQL>

How to overwrite a log and bad file in external table in oracle 10g

Hi,
I have used external table in oracle 10g.whenever use select query in external table orace internally create one log file in specified directory,
but this log file is growing.How can i overwrite the log file(old to replace with new).I need overwrite a log and bad file in external table.
kindly give the solutions.
By
Siva

I don't believe that is possible with the LOGFILE clause, but it may be with the BADFILE clause. Here is an excerpt from the documentation :
The LOGFILE clause names the file that contains messages generated by the external tables utility while it was accessing data in the datafile. If a log file already exists by the same name, the access driver reopens that log file and appends new log information to the end. This is different from bad files and discard files, which overwrite any existing file. NOLOGFILE is used to prevent creation of a log file.
If you specify LOGFILE, you must specify a filename or you will receive an error.
If neither LOGFILE nor NOLOGFILE is specified, the default is to create a log file. The name of the file will be the table name followed by _%p and it will have an extension of .log.

How to query an external table?

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