The following example logs errors internally in Greenplum Database and sets an error threshold of 10 errors.

=# CREATE EXTERNAL TABLE ext_expenses ( name text, 
   date date,  amount float4, category text, desc1 text ) 
   LOCATION ('gpfdist://etlhost-1:8081/*', 
             'gpfdist://etlhost-2:8082/*')
   FORMAT 'TEXT' (DELIMITER '|')
   LOG ERRORS SEGMENT REJECT LIMIT 10 
     ROWS;

Use the built-in SQL function gp_read_error_log('external_table') to read the error log data. This example command displays the log errors for ext_expenses:

SELECT gp_read_error_log('ext_expenses');

For information about the format of the error log, see Viewing Bad Rows in the Error Table or Error Log.

The built-in SQL function gp_truncate_error_log('external_table') deletes the error data. This example deletes the error log data created from the previous external table example :

SELECT gp_truncate_error_log('ext_expenses'); 

The following example creates an external table, ext_expenses, sets an error threshold of 10 errors, and writes error rows to the table err_expenses.

=# CREATE EXTERNAL TABLE ext_expenses ( name text, 
   date date,  amount float4, category text, desc1 text ) 
   LOCATION ('gpfdist://etlhost-1:8081/*', 
             'gpfdist://etlhost-2:8082/*')
   FORMAT 'TEXT' (DELIMITER '|')
   LOG ERRORS INTO err_expenses SEGMENT REJECT LIMIT 10 
     ROWS;