Message Gateway to MQ slow

I have a system the propagates messages to a consolidated database where the messages are transformed by the Message Gateway subscriber and placed on the foreign queue.
With the exception of the move from the AQ queue --> MQ queue using the gateway, all the queues/subscribers move the messages quickly, including the MQ queues that distribute the messages to foreign queues.
The time required to move the messages from the AQ queue, across the foreign queue to MQ is causing a backup of messages in the AQ queue - approx 1.2 million messages.
I can seem to pinpoint where the problem is occurring...(in the transformation, in the JMS, in the network?)
Any help would be appreciated,
Kevin

Thanks for the suggestions. I did setup statspack and collected statistics over a day or so. I ended up tuning the buffer cache and was able to process over 2 million messages in less that 24 hours. The queues are almost always clear now. Thanks again.

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Hi,
I am very new to oracle AQ and oracle messaging gateway. I am actually trying to propagate a message from oracle to middleware through oracle messaging gateway.
I have created the link between oracle messaging gateway and middleware(IBM Websphere).
1.*Created an object type with a single attribute of type sys.xmltype*.
create or replace type xpctas_type as object(payload sys.xmltype);
2.*Created a qtable with payload type as xpctas_type, a queue and started the queue.*begin
dbms_aqadm.create_queue_table(
queue_table => 'xpctas_qtab',
queue_payload_type => 'xpctas_type',
multiple_consumers => TRUE
dbms_aqadm.create_queue(queue_name =>'xpctas_q',
queue_table => 'xpctas_qtab',
max_retries => 16);
dbms_aqadm.start_queue('xpctas_q');
end;
3.*Created a transformation that converts user defined type xpctas_type to messaging gateway canonical type sys.MGW_BASIC_MSG_T.*
For this I created a function that converts xpctas_type to messaging gateway canonical type sys.MGW_BASIC_MSG_T.
CREATE OR REPLACE FUNCTION APPS.order_2_basic(my_order in xpctas_type)
RETURN sys.mgw_basic_msg_t
IS
v_xml XMLTYPE;
v_text varchar2(4000);
v_clob CLOB;
v_basic sys.mgw_basic_msg_t;
text_body sys.mgw_text_value_t;
header     sys.mgw_name_value_array_t;
BEGIN
v_xml := XMLTYPE.createXML(my_order,NULL,NULL);
v_basic := sys.mgw_basic_msg_t.construct;
header := sys.mgw_name_value_array_t(sys.mgw_name_value_t.construct_integer('MGW_MQ_characterSet','1208'),
sys.mgw_name_value_t.construct_integer('MGW_MQ_priority', '7'));
IF(LENGTH(v_xml.getstringval())>0 AND LENGTH(v_xml.getstringval())<=4000) THEN
v_text := v_xml.getStringVal();
text_body := sys.mgw_text_value_t(v_text,NULL);
ELSE
dbms_lob.createtemporary(v_clob,TRUE,dbms_lob.session);
v_clob:=v_xml.getClobVal();
text_body := sys.mgw_text_value_t(NULL,v_clob);
dbms_lob.freetemporary(v_clob);
END IF;
v_basic:=sys.mgw_basic_msg_t(header,text_body,NULL);
RETURN v_basic;
END order_2_basic;
begin
dbms_transform.create_transformation(
schema => 'apps',
name => 'order_to_basic',
from_schema => 'apps',
from_type => 'xpctas_type',
to_schema => 'sys',
to_type => 'mgw_basic_msg_t',
transformation => 'Apps.order_2_basic(source.user_data)');
end;
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declare
v_options sys.mgw_properties;
gv_mq_queue_name VARCHAR2(32);
begin
gv_mq_queue_name := 'MB.O2C.SOFTWARESOLUTION';
v_options := sys.mgw_properties(
sys.mgw_property('MQ_openOptions', '2066') );
dbms_mgwadm.register_foreign_queue(
name => 'destq', -- MGW foreign queue name
linkname => 'mqlink', -- name of link to use
provider_queue => RTRIM(gv_mq_queue_name), -- name of MQSeries queue
domain => dbms_mgwadm.DOMAIN_QUEUE, -- single consumer queue
options => v_options );
end;
5.     Added a subscriber with transformation.
begin
dbms_mgwadm.add_subscriber(
subscriber_id => 'sub_aq2mq', -- MGW subscriber name
propagation_type => dbms_mgwadm.outbound_propagation,
queue_name => 'apps.xpctas_q',
destination => 'destq@mqlink',
transformation => 'apps.order_to_basic');
end;
6.     Added a scheduler
begin
dbms_mgwadm.schedule_propagation(
-- schedule name
schedule_id => 'sch_aq2mq',
-- outbound propagation
propagation_type => dbms_mgwadm.outbound_propagation,
-- AQ queue name
source =>'apps.xpctas_q',
-- MGW foreign queue with link
destination =>'destq@mqlink');
-- The remaining fields currently not used by MGW
end;
7.     Enqueued a user defined data type into the qtable.
declare
l_xmlstring varchar2(2000);
l_payload sys.xmltype;
my_order xpctas_type;
enqueue_options DBMS_AQ.enqueue_options_t;
message_properties DBMS_AQ.message_properties_t;
msgid RAW( 16 );
v_num Number;
begin
SELECT '<?xml version="1.0" encoding="UTF-8" ?>
<Q1:XXRFG_PRCS_CNCT_TO_ASSETS_STG xmlns:Q1="http://www.ibm.com/websphere/crossworlds/2002/BOSchema/XXRFG_PRCS_CNCT_TO_ASSETS_STG" version="3.0.0" verb="Create" locale="en_US.UTF-8" delta="false">
<Q1:STAGING_ID>221</Q1:STAGING_ID>
<Q1:SW_INSTANCE_ID>18595755</Q1:SW_INSTANCE_ID>
<Q1:MC_INSTANCE_ID>194734</Q1:MC_INSTANCE_ID>
<Q1:OPCO>NUK</Q1:OPCO>
<Q1:RELATIONSHIP_FLAG>N</Q1:RELATIONSHIP_FLAG>
<Q1:RELATIONSHIP_TYPE>Connected To</Q1:RELATIONSHIP_TYPE>
<Q1:ObjectEventId />
</Q1:XXRFG_PRCS_CNCT_TO_ASSETS_STG>'
INTO l_xmlstring
FROM dual;
SELECT XMLTYPE(l_xmlstring)
INTO l_payload
FROM dual;
my_order:=xpctas_type(l_payload);
dbms_output.put_line(my_order.payload.getstringval());
DBMS_AQ.enqueue( queue_name => 'APPS.xpctas_q',
enqueue_options => enqueue_options,
message_properties => message_properties,
payload => my_order,
msgid => msgid
COMMIT;
END;
As soon as I enqueued the message the subscriber picked the message and sent it to middleware. I found the below message in the middleware
MD            ÿÿÿÿ      ¸ MQSTR         AMQ HBU473QC61 PTÀ+H^                                                                            HBU473QC61                                      mqm                                                                                                        2012112109335869                                       ÿÿÿÿ
*<XPCTAS_TYPE><PAYLOAD><Q1:XXRFG_PRCS_CNCT_TO_ASSETS_STG xmlns:Q1="http://www.ibm.com/websphere/crossworlds/2002/BOSchema/XXRFG_PRCS_CNCT_TO_ASSETS_STG" version="3.0.0" verb="Create" locale="en_US.UTF-8" delta="false">*
*<Q1:STAGING_ID>221</Q1:STAGING_ID>*
*<Q1:SW_INSTANCE_ID>18595755</Q1:SW_INSTANCE_ID>*
*<Q1:MC_INSTANCE_ID>194734</Q1:MC_INSTANCE_ID>*
*<Q1:OPCO>NUK</Q1:OPCO>*
*<Q1:RELATIONSHIP_FLAG>N</Q1:RELATIONSHIP_FLAG>*
*<Q1:RELATIONSHIP_TYPE>Connected To</Q1:RELATIONSHIP_TYPE>*
*<Q1:ObjectEventId/>*
*</Q1:XXRFG_PRCS_CNCT_TO_ASSETS_STG>*
*</PAYLOAD></XPCTAS_TYPE>*
It has some junk data in the begining. How can I remove this junk data?? Any help provided on this would be of great help.
Experts on oracle mesaging gateway and AQ, Please help.
Thanks & Regards,
Sachin

Hello,
your setup of the message gateway seems to be ok.
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