VPD+DBLINK

Question

Hi, I am trying VPD functionality, Can any one guide me?
I have 2 schema in one database
shema are 1.bdev 2.hdev
I have customer table in hdev schema like
Table CUSTOMERS -
COD_ENTITY VARCHAR2(20)
CUST_ID NUMBER
CUST_NAME VARCHAR2(20)
create table customers
(cod_entity varchar2(20),
cust_id number,
cust_name varchar2(20));
Customer table Data
COD_ENTITY CUST_ID CUST_NAME
MARK 123 Tom
SALES 456 Wim Patel
MARK 124 George
SALES 789 Smith
There is a view in bdev schema which is based on CUSTOMERS table of hdev schema.
view
CREATE OR REPLACE VIEW CUSTOMERS
(COD_ENTITY, CUST_ID, CUST_NAME) AS
SELECT COD_ENTITY, CUST_ID, CUST_NAME FROM CUSTOMERS@dllink
here dllink is a database link which points to hdev. That means CUSTOMERS view in bdev retrieves data from hdev and shows when I query select * from customers at dhev
Now here problem comes, I want to apply VPD policy on CUSTOMER table at hdev
Policy function at hdev
create or replace function vpd_func_customers
p_schema in varchar2,
p_table in varchar2
return varchar2
as
l_retstr varchar2(2000);
l_ctr number;
begin
if (SYS_CONTEXT ('USERENV', 'CLIENT_INFO') = 'ALL') then
l_retstr := null;
else
l_retstr := '(cod_entity = SYS_CONTEXT (''USERENV'', ''CLIENT_INFO'')) OR (cod_entity = ''ALL'')';
end if;
return l_retstr;
end;
Applied Policy at hdev on Customer table
begin
dbms_rls.add_policy (
object_schema => 'hdev',
object_name => 'CUSTOMERS',
policy_name => 'vpd_customers_policy',
function_schema => 'hdev',
policy_function => 'vpd_func_customers',
statement_types => 'SELECT,INSERT,UPDATE,DELETE',
update_check => TRUE
end;
Now tested policy function at hdev
call DBMS_APPLICATION_INFO.SET_CLIENT_INFO ('MARK')
select * from customers
it gave me two rows
1 MARK 123 Tom
2 MARK 124 George
upto this is ok
but when I logon to bdev and fires query
call DBMS_APPLICATION_INFO.SET_CLIENT_INFO ('MARK')
select * from customers
it gives me zero rows.
PLEASE HELP ME OUT HOW TO USE VPD with DBLINK. I NEED IT URGENT FOR MY PROJECT.
Thanks in Advance
Santosh

Answer 1

Santhosh,
you are posting to the wrong forum. Its a database related question and should be posted on a database forum.
Frank