Oracle 11gR2 to SQL Server 2008 R2 - Problem executing SP on SQL server

Question

Hi,
I have this problem: Executing a sp in SQL server from oracle
--------------------ORACLE SP--------------------
create or replace
PROCEDURE DRIVER_SP
AP IN OUT appl_param%ROWTYPE
as
v_sp_name varchar2(50);
v_control_id number;
val VARCHAR2(100);
cur INTEGER;
nr INTEGER;
BEGIN
v_sp_name := ap.MESSAGE_MISC_TEXT;
v_control_id := ap.control_id;
cur := DBMS_HS_PASSTHROUGH.OPEN_CURSOR@dblink_sqlserver;
DBMS_HS_PASSTHROUGH.PARSE@dblink_sqlserver(cur, 'execute ' || v_sp_name || ' ' || to_char(v_control_id));
LOOP
nr := DBMS_HS_PASSTHROUGH.FETCH_ROW@dblink_sqlserver(cur);
EXIT WHEN nr = 0;
DBMS_HS_PASSTHROUGH.GET_VALUE@dblink_sqlserver(cur, 1, val);
END LOOP;
DBMS_HS_PASSTHROUGH.CLOSE_CURSOR@dblink_sqlserver(cur);
driver_ap01_log_msg('Procedure returned: ' || val);
commit;
exception
when others then
driver_ap01_log_msg(sqlerrm);
END DRIVER_SP;
--------------------SQL Server SP-----------------------
ALTER PROCEDURE [dbo].[PA01_SP]
@control_id integer
AS
begin
--update PA01
--set infile_control_id = @control_id
--insert into dbo.PA01LOG(msg) values('test')
select 0
end
THE PROBLEM: Oracle SP calls SQL Server SP and any time I try to INSERT/UPDATE/DELETE (DML) within SQLServer SP it throws an exception on Oracle's end. Once I comment all DML code the proc runs fine.
+"ORA-28511: lost RPC connection to heterogeneous remote agent using SID=ORA-28511: lost RPC connection to heterogeneous remote agent using SID=(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=xxxxxxx)(PORT=1511))(CONNECT_DATA=(SID=dg4msql)))+
+ORA-02063: preceding line from DBLINK_SQLSERVER"+
Please help.
Thanks

Answer 1

Thanks for your response, it got me closer to my goal. I'm still facing one problem:
Let me explain what I need to achieve
Purpose
Execute an Oracle stored procedure which in turn executes a stored procedure on remote SQLServer which updates local tables on that SQLServer.
Observations
The execution of both procedures completes successfully. However, an explicit COMMIT statement must be issued on the Oracle session which initiated the transaction before any data could be read from the SQLServer updated table.
The following is test exercise for proof of concept.
PL/SQL code
declare
out_arg integer;
ret_val integer;
begin
out_arg := 0;
ret_val := "dbo"."ZZZ_SP"@DBLINK_SQLSERVER(10, out_arg);
dbms_output.put_line(to_char(out_arg));
end;
SQLServer code
ALTER procedure [dbo].[ZZZ_SP] (@arg1 integer, @arg2 integer output)
AS
begin tran tran1
insert into dbo.PA01LOG(msg) values('ddd')
commit tran tran1
set @arg2 = @arg1 * 100
select -1
GO
I have put the Oracle gateway in Single_Site mode to avoid two phase commit. I want SQLServer to be able to run its own transaction management. I don't want Oracle to be responsible for completing the transactions which take place within SQLServer.
I fear there might be a gap in my knowledge.
Any ideas why I need to issue a COMMIT in Oracle session to release the lock from SQLServer table?
Thanks