MS DTS and OLE DB

Question

I have constructed an Oracle VIEW which has a WHERE clause that limits data from its underlying table, by using a date literal, i.e. (WHERE datevar > '01-JAN-2009'). Is it possible that when the VIEW is accessed with the DTS tool of MS SQL Server and Oracle OLE DB version 10g, by an Oracle user with SELECT permission on the VIEW, that rows may be returned which violate the VIEW's WHERE condition? In other words, can the query return rows with a datevar that is less than '01-JAN-2009' from the underlying table?

Answer 1

The usual cause for wierd issues with oraoledb involving dates, that dont seemingly reproduce via sqlplus, is the date format.
Were you able to test the same in sqlplus? What were the results?
I cant even run that in sqlplus. For example, using the emp table.....
SQL> select ename, hiredate from emp where deptno=10;
ENAME HIREDATE
CLARK 09-JUN-81
KING 17-NOV-81
MILLER 23-JAN-82
SQL> create or replace view empview as
2 select * from emp where hiredate >'01-JAN-1982' and deptno=10;
View created.
SQL> select ename from empview;
ENAME
MILLER
SQL> alter session set NLS_DATE_FORMAT='YYYY-MM-DD';
Session altered.
SQL> select ename from empview;
select ename from empview
ERROR at line 1:
ORA-01858: a non-numeric character was found where a numeric was expected
The fact that the query doesnt even run (for me at least) leads me to belive that that's not the query that is actually being executed.
If changing the date format still doesnt make the same behavior occur in sqlplus, then there's more to the story. I'd enable tracing to confirm the statement being executed is actually what you think it is.
Short of that, I dont really have any good suggestions. You're correct that using OLEDB doesnt grant permissions, alter view definitions, etc. The oledb connection is still just an oracle client connection, like anyting else. The obvious usual gotcha though is just that by default it changes the date format.
Greg