AQ Callback across two Schemas

Question

I'm trying to get AQ Callback working across 2 Schemas. I have it working fine when all is contained in a single Schema but when I split it out across 2 Schemas I get no messages dequeued. I'll post the code once I've had a chance to sanitise it but here's a summary of what we're doing:
1. Type created in Schema A - this will be the message payload.
2. Grant all on Type to Schema B.
3. Create Queue and Q Tab and Start Q in Schema A.
4. Create Enqueue Procedure in Schema A.
5. Create Dequeue Procedure in Schema B.
6. Add Subscriber (from Schema A, but that should be incidental)
7. Register the Callback (from Schema A) so that Schema B Dequeue Procedure is invoked via Callback.
If I enqueue a message from Schema A is just sits on the queue forever.
I'm convinced it's a permissions/privileges thing but I can't work it out. If anyone has experienced this before I'm very interested in any advice you have!
Cheers,
Pete

Answer 1

Hi,
I am also facing a similar issue. Is it required all the AQ infrastructure (Message tables, queues, enqueue and dequeue functions) be in the same schema? Below is my code, If I remove the schema qualifier - 'reddypr_rms01' from the below code, enqueue works fine, but it never dequeues. If I use the schema names then everything works fine.
The database is structured as follows, all my application tables, procedures etc is in schema 'rms01'. These objects are just synonyms in the schema 'reddypr_rms01'. I have created the AQ modules locally in reddypr_rms01.
create Type reddypr_rms01.message_typ_1 as object (
subject Varchar2(30), text Varchar2(80)
begin
dbms_aqadm.create_queue_table(
queue_table => 'reddypr_rms01.objmsgs80_qtab_1',
queue_payload_type => 'reddypr_rms01.Message_typ_1',
multiple_consumers => true);
dbms_aqadm.create_queue(
queue_name => 'MSG_QUEUE',
queue_table => 'reddypr_rms01.objmsgs80_qtab_1');
dbms_aqadm.start_queue(
queue_name => 'MSG_QUEUE');
end;
create procedure enqueue_msg( p_msg in varchar2 )
as
enqueue_options dbms_aq.enqueue_options_t;
message_properties dbms_aq.message_properties_t;
message_handle RAW(16);
message reddypr_rms01.message_typ_1;
begin
message := message_typ_1('NORMAL MESSAGE', p_msg );
dbms_aq.enqueue(queue_name => 'msg_queue',
enqueue_options => enqueue_options,
message_properties => message_properties,
payload => message,
msgid => message_handle);
end;
create table message_table(
msg Varchar2(4000)
create or replace procedure notifyCB( context raw,
reginfo sys.aq$_reg_info,
descr sys.aq$_descriptor,
payload raw,
payloadl number)
as
dequeue_options dbms_aq.dequeue_options_t;
message_properties dbms_aq.message_properties_t;
message_handle raw(16);
message reddypr_rms01.message_typ_1;
begin
dequeue_options.msgid := descr.msg_id;
dequeue_options.consumer_name := descr.consumer_name;
DBMS_AQ.DEQUEUE(
queue_name => descr.queue_name,
dequeue_options => dequeue_options,
message_properties => message_properties,
payload => message,
msgid => message_handle);
insert into message_table values(
'Dequeued and processed "' || message.text || '"' );
commit;
end;
begin
dbms_aqadm.add_subscriber(
queue_name => 'reddypr_rms01.msg_queue',
subscriber => sys.aq$_agent('recipient', null, null));
end;
begin
dbms_aq.register(sys.aq$_reg_info_list(
sys.aq$_reg_info('reddypr_rms01.MSG_QUEUE:RECIPIENT',
DBMS_aq.NAMESPACE_AQ,
'plsql://reddypr_rms01.notifyCB',
HEXTORAW('FF')) ) ,
1);
end;
begin
enqueue_msg('Advance_Queuing');
end;
/