Oracle Change Notification issues

Question

Hi experts,
I want to track all DML changes that are done with some tables. i have used oracle change notification feature for this.
I have created setup but changes are not notified back to the caller procedure. procedure is not even called.
version information and set up scripts are as follows:
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - Prod
PL/SQL Release 10.2.0.3.0 - Production
CORE 10.2.0.3.0 Production
TNS for Linux: Version 10.2.0.3.0 - Production
NLSRTL Version 10.2.0.3.0 - Production
CONNECT / AS SYSDBA;
GRANT EXECUTE ON DBMS_CHANGE_NOTIFICATION TO HR;
GRANT CHANGE NOTIFICATION TO HR;
ALTER SYSTEM SET "JOB_QUEUE_PROCESSES"=500;
CONNECT hr/hr;
Rem Create a table to record notification events
CREATE TABLE nfevents(regid number, event_type number);
Rem create a table to record changes to registered tables
CREATE TABLE nftablechanges(regid number, table_name varchar2(100),
table_operation number);
Rem create a table to record rowids of changed rows.
CREATE TABLE nfrowchanges(regid number, table_name varchar2(100),
row_id varchar2(30));
Rem Create a PL/SQL callback handler to process notifications.
CREATE OR REPLACE PROCEDURE chnf_callback(ntfnds IN SYS.CHNF$_DESC) IS
regid NUMBER;
tbname VARCHAR2(60);
event_type NUMBER;
numtables NUMBER;
operation_type NUMBER;
numrows NUMBER;
row_id VARCHAR2(20);
BEGIN
regid := ntfnds.registration_id;
numtables := ntfnds.numtables;
event_type := ntfnds.event_type;
INSERT INTO hr_test (msg) VALUES ('calling start');
COMMIT;
INSERT INTO nfevents VALUES(regid, event_type);
IF (event_type = DBMS_CHANGE_NOTIFICATION.EVENT_OBJCHANGE) THEN
FOR i IN 1..numtables LOOP
tbname := ntfnds.table_desc_array(i).table_name;
operation_type := ntfnds.table_desc_array(I). Opflags;
INSERT INTO nftablechanges VALUES(regid, tbname, operation_type);
/* Send the table name and operation_type to client side listener using UTL_HTTP */
/* If interested in the rowids, obtain them as follows */
IF (bitand(operation_type, DBMS_CHANGE_NOTIFICATION.ALL_ROWS) = 0) THEN
numrows := ntfnds.table_desc_array(i).numrows;
ELSE
numrows :=0; /* ROWID INFO NOT AVAILABLE */
END IF;
/* The body of the loop is not executed when numrows is ZERO */
FOR j IN 1..numrows LOOP
Row_id := ntfnds.table_desc_array(i).row_desc_array(j).row_id;
INSERT INTO nfrowchanges VALUES(regid, tbname, Row_id);
/* optionally Send out row_ids to client side listener using UTL_HTTP; */
END LOOP;
END LOOP;
END IF;
COMMIT;
END;
Rem Create a REGISTRATION on the EMPLOYEES TABLE
DECLARE
REGDS SYS.CHNF$_REG_INFO;
regid NUMBER;
mgr_id NUMBER;
dept_id NUMBER;
qosflags NUMBER;
BEGIN
qosflags := DBMS_CHANGE_NOTIFICATION.QOS_RELIABLE +
DBMS_CHANGE_NOTIFICATION.QOS_ROWIDS;
REGDS := SYS.CHNF$_REG_INFO ('chnf_callback', qosflags, 0,0,0);
regid := DBMS_CHANGE_NOTIFICATION.NEW_REG_START (REGDS);
SELECT manager_id INTO mgr_id FROM EMPLOYEES WHERE employee_id = 200;
DBMS_CHANGE_NOTIFICATION.REG_END;
END;
UPDATE employees SET salary=salary*1.05 WHERE employee_id=203;
COMMIT;
SQL> SELECT * FROM nfevents;
No Rows Returned
SQL> SELECT * FROM nftablechanges;
No Rows Returned
SQL> select * from nfrowchanges;
No Rows Returned
SQL> select * from hr_test;
No Rows Returned
Please check the scripts and let me know if change is required.
Regards,

Answer 1

This does not look like reinventing the wheel. The code is on first sight a copy of the exemple in the developer's guide - fundamentals (10g2). Too bad nobody answered this question. The problem is in the line CREATE OR REPLACE PROCEDURE chnf_callback(ntfnds IN SYS.CHNF$_DESC) IS ..., when you look at the trace, it says "PLS-00306: wrong number or types of arguments in call to <procedure>".
The type of the parameter to the procedure is however a gift from Oracle and I do not know how to change it or what is wrong with it. So, either the predefined type or the notification routine has an error, and I wonder if there is a patch for this on Metalink, but I have no access. If anybody has more information or can help me, I would be very happy.
I am using XE on Windows xpsp3.
Onno