Error ora-02070

Question

Hi to all,
I have created a view in oracle 10g using an MS SQL 2005 table, like this:
CREATE OR REPLACE VIEW EXTRACT_VIEW
(D_FLD1, D_NOTES, D_CODE, D_DATE, D_FLAG)
AS
SELECT
D_FLD1,
D_NOTES,
LPAD(TO_CHAR(D_CODE), 6, '0'),
SUBSTR(D_DATE, 7,2) || '/' || SUBSTR(D_DATE, 5, 2) || '/' || SUBSTR(D_DATE, 1, 4),
D_FLAG
FROM sqltable@dblink
WHERE (D_FLD1 = '2007') AND (D_FLAG = 1)
In the MS SQL Table the field are declared:
D_FLD1 nvarchar(4)
D_NOTES text
D_CODE int
D_DATE nvarchar(8)
D_FLAG bit
When the view run, this message is displayed:
ORA-02070: database stringstring does not support string in this context
Cause: The remote database does not support the named capability in the context in which it is used.
Action: Simplify the SQL statement.
If I modify my view, eliminating the field D_NOTES, all work fine.
Can You help me in order to resolve this problem ?
Thank You and Best regards.
Gaetano
Message was edited by:
NICK048

Answer 1

I'm not sure if you are using HSODBC or TG4mSQL but I assume it is HSODBC.
The problem here is the function LPAD combined with the LONG column being used in the select. HSODBC does not support it thus post processing will occure. Post processing means all records from the remote database are fetched into the Oracle db and the statement is then processed locally.
Best would be to create a view at the SQL Server side with the functions you need and then select from the SQL Server view instead of the table directly.
The big advantage is that only the results are fetched and not ALL records like it happens during post processing.