Solve problems with external table - oracle

Question

I have problems with some Oracle external table
create table myExternalTable
(field1, field2....)
ORGANIZATION EXTERNAL
(TYPE ORACLE_LOADER
DEFAULT DIRECTORY myDirectory
ACCESS PARAMETERS
(RECORDS DELIMITED BY NEWLINE
NOLOGFILE
NOBADFILE
NODISCARDFILE
FIELDS TERMINATED BY '$')
LOCATION ('data.dsv'));
commit;
alter table myExternalTable reject limit unlimited; --solve reject limit reached problem
select * from myExternalTable;
When I select on the table I have this error :
ERROR at line 1:
ORA-29913: error in executing ODCIEXTTABLEOPEN callout
ORA-29400: data cartridge error
KUP-04040: file data.dsv in myDirectory not found
It seems that the error description is not right because normally the table is already loaded with data.dsv when created.
Plus data.dsv exists in myDirectory.
What is going on? Can somebody help?
Note :
Instead of the select, this is what I normally do :
merge into myDatabaseTable
using
(select field1, field2,.... from myExternalTable) temp
on (temp.field1= myDatabaseTable.field1)
when matched then update
set myDatabaseTable.field1 = temp.field1,
myDatabaseTable.field2 = temp.field2,
......;
This works good on my development environment but on some other environment I have the error I said before :
ERROR at line 1:
ORA-29913: error in executing ODCIEXTTABLEOPEN callout
ORA-29400: data cartridge error
KUP-04040: file data.dsv in myDirectory not found
First I thought that, in the environment it does not work, the directory did not point where it had to but selecting on dba_directories table, I could see the path of the directory is correct.

Answer 1

The problem is related with the access rights of the user on the operating system side. It is defined in Oracle Support Note Create Database Directory on Remote Share/Server (Doc ID 739772.1)
For my case, I created the directory with a sysdba and then for allowing other users to accesss that external table, I created another table which is creates by Create Table as Select statement for the external table. Otherwise, I need to map the Windows Oracle Service owner user to the exact Oracle user which is already defined in the note.
So, it is more like a well fitting workaround for my case.
To sum up the steps in a nutshell:
1- Create the external table T2
2- Create a table named T1 with CTAS to external table
3- Give SELECT right to T1
Hope this helps for your case.