Ask about DML Handler for Streams at the Schema level ?

Question

Hi all !
I use Oracle version 10.2.0.
I have two DB is A (at machine A, and it used as source database) and B (at machine B - destination database). Some changes from A will apply to B.
At B, I installed oracle client to use EMC (Enterprise Manager Console) tool to generate some script, and use them to configure Streams environment, I configured Streams at the Schema level (DML and DDL) => I successed ! But I have two problems is:
+ I write a DML Handler, called "emp_dml_handler" and want set it to EMP table only. So, I must DBMS_STREAMS_ADM.ADD_TABLE_RULES ? (I configured: DBMS_STREAMS_ADM.ADD_SCHEMA_RULES) such as:
BEGIN
DBMS_STREAMS_ADM.ADD_SCHEMA_RULES(
schema_name => '"HOSE"',
streams_type => 'APPLY',
streams_name => 'STRMADMIN_BOSCHOSE_REGRES',
queue_name => 'apply_dest_hose',
include_dml => true,
include_ddl => true,
source_database => 'DEVELOP.REGRESS.RDBMS.DEV.US.ORACLE.COM');
END;
and after:
DECLARE
emp_rule_name_dml VARCHAR2(50);
emp_rule_name_ddl VARCHAR2(50);
BEGIN
DBMS_STREAMS_ADM.ADD_TABLE_RULES(
table_name => 'HOSE.EMP,
streams_type => 'APPLY',
streams_name => 'STRMADMIN_BOSCHOSE_REGRES',
queue_name => 'apply_dest_hose',
include_dml => true,
include_ddl => true,
source_database => 'DEVELOP.REGRESS.RDBMS.DEV.US.ORACLE.COM',
dml_rule_name => emp_rule_name_dml,
ddl_rule_name => emp_rule_name_ddl);
DBMS_APPLY_ADM.SET_ENQUEUE_DESTINATION(
rule_name => emp_rule_name_dml,
destination_queue_name => 'apply_dest_hose');
END;
BEGIN
DBMS_APPLY_ADM.SET_DML_HANDLER(
object_name => 'HOSE.EMP',
object_type => 'TABLE',
operation_name => 'UPDATE',
error_handler => false,
user_procedure => 'strmadmin.emp_dml_handler',
apply_database_link => NULL,
apply_name => NULL);
END;
... similar for INSERT and DELETE...
I think that I only configure streams at the schema level and exclude EMP table, am i right ?
+ At the source, EMP table have a primary key. And I configured:
ALTER TABLE HOSE.EMP ADD SUPPLEMENTAL LOG DATA (PRIMARY KEY) COLUMNS;
==> So, at the destination, have some works that I must configure the substitute key for EMP table ?
Have some ideas for my problems ?
Thanks
Edited by: changemylife on Sep 24, 2009 10:45 PM

Answer 1

If you want to discard emp from schema rule, then just add a negative rule, either on capture or apply.
What is the purpose of :
DBMS_APPLY_ADM.SET_ENQUEUE_DESTINATION(
rule_name => emp_rule_name_dml,
destination_queue_name => 'apply_dest_hose');sound like you are enqueunig into 'apply_dest_hose' all the rows for this table that comes from ... 'apply_dest_hose'
Next you declare a DML_HANDLER that is attached to nobody :
BEGIN
DBMS_APPLY_ADM.SET_DML_HANDLER(
object_name => 'HOSE.EMP',
object_type => 'TABLE',
operation_name => 'UPDATE',
error_handler => false,
user_procedure => 'strmadmin.emp_dml_handler',
apply_database_link => NULL,
apply_name => NULL);           <----- nobody rules the world!
END;the sequence of evaluation is normally :
APPLY_PROCESS (reader)
          |
          | -->  RULE SET
                      |
                      | --> RULE .....
                      | --> RULE
                                 |
                                 | --> evaluate OK then --> exist DML_HANDLER  --> YES --> call DML_HANDLER --> on LCR.execute call coordinator
                                                                                        |
                                                                                        | NO
                                                                                        |                                                                 
                                                                                   Implicit apply (give LCR to coordinator which dispatch to one apply server)    
                                                  Since your dml_handler is attached to null apply process it will never be called by anybody and your LCR for table emp will be implicit applied by its apply process.