Dequeue from multi consumer queue without consumer_name

Are there any way to efficient emptying a multiconsumer queue where mesages by sender are taged with consumer_name, and there are multiple consumers?

Christian,
I have the same question. Have you got any answer or found out any good solution?
Thx!

Similar Messages

Dequeue from multi consumer queue table

Hi,
Even after all consumers I created have dequeued the messages (in REMOVE mode), they just didn't go from the queue table. Although my application works fine (the messages could no longer be dequeued again), I am afraid this will affect performance when messages piled up in Q table.
I tried maunally delete the records in Q table. But the question is "is there an automatic way to handle this?"
Thx for any feedback!

Make sure that the init.ora parameter AQ_TM_PROCESSES is set to 1 or more. This is the parameter that controls the number of processes available to clean up the queue after the messages have been dequeued or the message has expired.

Retry counts on multi consumer queues in Java

Is there a way to get the retry count of a message that has been dequeued from a multiconsumer queue? I believe we were able to access the retry count of a message on a single consumer queue, but when dequeuing from a multiconsumer queue, the retry count field is not filled with a value.
Can this be done?

Is there a way to get the retry count of a message that has been dequeued from a multiconsumer queue? I believe we were able to access the retry count of a message on a single consumer queue, but when dequeuing from a multiconsumer queue, the retry count field is not filled with a value.
Can this be done?

How to send message to a multi-consumer queue using pl/sql

How to send message to a multi-consumer queue using pl/sql ? Thanks.
I tried following, but got an message: no receipient specified.
DBMS_AQ.ENQUEUE(
queue_name => 'aqadm.multi_queue',
enqueue_options => queue_options,
message_properties => message_properties,
payload => my_message,
msgid => message_id);
COMMIT;
END;
/

Here's two way to enqueue/publish new message into multi-consumer queue.
(1) Use explicitly declared recipient list
- Specify "Recipients" by setting recipient_list to messge_properties, before ENQUEUE().
DECLARE
recipients DBMS_AQ.aq$_recipient_list_t;
BEGIN
recipients(1) := sys.aq$_agent('RECIPIENTNAME',NULL,NULL);
message_properties.recipient_list := recipients ;
(2)Or, declare subscriber list permanently. Then you need not to specify recipient list each time you call ENQUEUE().
begin
dbms_aqadm.add_subscriber(
queue_name=>'YOURQUEUE',
subscriber=> sys.aq$_agent('RECIPIENTNAME', null, null)
end;
You can add 1024 local subscriber include maximum 32 remote-queue-consumer to one queue.

PL/SQL Callback registered on multi consumer queue takes 6 seconds to call

Registered a PL/SQL callback procedure on multi consumer Queue. if I enqueue message into queue, it takes 6 seconds to call PL/SQL callback procedure.
Why does it takes 6 seconds ?
I believe Queue submits DBMS Job to execute the Callback. I am not sure why it is taking 6 seconds to execute the callback.
are there any configarable parameters to set which allows callbacks to be executed more frequently?

You can try to change jobqueue_interval=1
This is a scan rate interval (seconds) of job queue parameter.
it is 5 sec by default.
Regards,
Sergey

Notify when message arrives in multi-consumer queue in Oracle 8i

Hi,
Is there any way by which we can get notified whenever a new message arrives in the multi-consumer queue ?
Thanks,
Shailesh

Probably a better shot of an answer in the AQ forum.
Advanced Queueing

Dequeue from an exception queue

Hi,
I am very new to oracle AQ and trying dequeuing of message from an exception queue. I have created a procedure for dequeuing a message from exception queue and is working fine. I have to execute this procedure manually each time a message is moved to the exception queue. Is there any mechanism to call this procedure automatically each time the message is moved to exception queue? Please help.
Thanks in Advance
Lokesh

Hello,
as you wrote you already have a code snippet with DBMS_AQ.DEQUEUE of an exception queue.
Wrap this DEQUEUE in an infinite loop (LOOP ... END LOOP). In order to have this procedure as an autonomous session
you can start it as a database job:
DECLARE
   v_jobno NUMBER(6);
BEGIN
    DBMS_JOB.SUBMIT( v_jobno,
                    'BEGIN <your module>; END;',
                    SYSDATE, NULL );
    COMMIT;
END;
/Kind regards,
WoG

Multi-consumer queue table does not empty

Hello,
I must be missing something pretty trivial here but I have setup queue with a queue table where multiple_consumers = true. When I dequeue a message from the queue it is received, but the message is still left in the queue table. When I do a second dequeue I get a end-of-fetch error.
Currently, there is only one subscriber and the subscriber is specified as the recipient of the message.
How do I get the messages removed from the queue table?
DECLARE
    queue_options       DBMS_AQ.ENQUEUE_OPTIONS_T;
    message_properties DBMS_AQ.MESSAGE_PROPERTIES_T;
    recipients          DBMS_AQ.AQ$_RECIPIENT_LIST_T;
    message_id          RAW(16);
    my_message          MYRESP_T;
BEGIN
    recipients(1) := sys.aq$_agent('MY_SUBSCRIBER',null,null);
    message_properties.recipient_list := recipients;
    my_message := MYRESP_T('99293','ORCL','TEST');
    DBMS_AQ.ENQUEUE(
        queue_name => 'RESP_Q',
        enqueue_options => queue_options,
        message_properties => message_properties,
        payload => my_message,
        msgid => message_id);
    COMMIT;
END;
DECLARE
        r_dequeue_options    DBMS_AQ.DEQUEUE_OPTIONS_T;
        r_message_properties DBMS_AQ.MESSAGE_PROPERTIES_T;
        v_message_handle     RAW(16);
        o_payload                 MYRESP_T;
        v_dynamic_sql           VARCHAR2(4000);
        BEGIN
            r_dequeue_options.wait := DBMS_AQ.NO_WAIT;
            r_dequeue_options.dequeue_mode := DBMS_AQ.REMOVE;
            r_dequeue_options.navigation := DBMS_AQ.FIRST_MESSAGE;
            r_dequeue_options.consumer_name := 'MY_SUBSCRIBER';
            DBMS_AQ.DEQUEUE(
                queue_name         => 'RESP_Q',
                dequeue_options    => r_dequeue_options,
                message_properties => r_message_properties,
                payload            => o_payload,
                msgid              => v_message_handle
          commit;
        END;Thanks in advance

Presumably the message gets left on the Q with a state of PROCESSED? If so then that suggests you have aq_tm_processes explicitly set to 0 (zero) in your spfile/pfile - these background processes clear messages which have been PROCESSED.
If this is not the case can you post the state of the messages and some more information like version and AQ related parameters?
Thanks
Paul

Muti Consumer Queue creation

Hi everyone,
While creating multi consumer queue, I have encountered with below error:
SQL> Begin
2 DBMS_AQADM.Create_Queue_Table(Queue_Table => 'qtbl_NearTime',
3 Queue_Payload_Type => 'NearTime',
4 Sort_List => Null,
5 Multiple_Consumers => True,
6 Storage_Clause => 'TABLESPACE USERS');
7 end;
8 /
Begin
DBMS_AQADM.Create_Queue_Table(Queue_Table => 'qtbl_NearTime',
Queue_Payload_Type => 'NearTime',
Sort_List => Null,
Multiple_Consumers => True,
Storage_Clause => 'TABLESPACE USERS');
end;
ORA-08103: object no longer exists
ORA-06512: at "SYS.DBMS_AQADM_SYS", line 2224
ORA-06512: at "SYS.DBMS_AQADM", line 58
ORA-06512: at line 2
I am working with Oracle 9i. Please advice.
Many thanks in advance.
Prabha

You'll have better-er luck in the AQ forum.
Advanced Queueing

Consuming queue from multiple processes

We have a program designed to consume a queue with consumer name set to "consumer". Here's how it dequeues messages:
dequeue_options.consumer_name := 'Consumer';
dequeue_options.navigation := DBMS_AQ.FIRST_MESSAGE;
dequeue_options.WAIT := 10;
DBMS_AQ.DEQUEUE(queue_name => 'ourschema.our_que',
dequeue_options => dequeue_options,
message_properties => message_properties,
payload => message,
msgid => message_handle);
If we run one instance of this program this dequeue operation above uses 10 CPU seconds over the duration of our load test. If we run two instances of the program (which consumes the same queue as the same consumer) then the dequeue operation above uses 160 CPU seconds. We need the second instance to remove a single point of failure but the 16 fold increase in load on our database is not acceptable for a dequeue operation.
Why is it so expensive to have two processes dequeuing from our_queue using the same consumer name?
thanks
Dale

We managed to solve the problem.
We had initiated a transaction to bracket the dequeue and a subsequent insert. Removing the transaction seems to have removed the performance hit from the second process.

Dequeue   elements from an apply - queue table

hi Everyone?
I'm tried dequeue elements from a queue table. This one, is associated to an apply streams process. I'd wrote this procedure to test a manual dequeue, but this error message appears :
ORA-25228: timeout or end-of-fetch during message dequeue from STADMIN.Q_APP_SELECTS_FROM_CRM
The queue is not empty
Help me please... thank you
The Procedure code is:
create or replace procedure str_clean_queue (cola in varchar2, tabla in varchar2, comando in varchar2) is
next_trans EXCEPTION;
pragma exception_init (next_trans, -25235);
no_messages EXCEPTION;
pragma exception_init (no_messages, -25228);
dequeueOpt dbms_aq.dequeue_options_t;
message_properties dbms_aq.message_properties_t;
message SYS.ANYDATA;
msgid raw(16);
newMess boolean;
lcr SYS.LCR$_ROW_RECORD;
a number :=0;
begin
dequeueOpt.CONSUMER_NAME := 'APP_SELECTS_FROM_CRM';
dequeueOpt.DEQUEUE_MODE := DBMS_AQ.LOCKED;
dequeueOpt.NAVIGATION := DBMS_AQ.FIRST_MESSAGE;
dequeueOpt.VISIBILITY := DBMS_AQ.IMMEDIATE;
dequeueOpt.WAIT :=10;
dequeueOpt.MSGID := null;
newMess:=True;
while (newMess) loop
begin
DBMS_AQ.DEQUEUE (
queue_name => 'STADMIN.'|| cola,
dequeue_options => dequeueOpt,
message_properties => message_properties,
payload => message,
msgid => msgid);
-- analizamos lo que llego en el payload
lcr := DBMS_STREAMS.CONVERT_ANYDATA_TO_LCR_ROW(message);
if (lcr.get_command_type = comando AND
lcr.get_object_name = tabla AND
lcr.get_object_owner = 'DBADMIN') then
-- hacer desaparecer el lcr de la cola
dequeueOpt.DEQUEUE_MODE := DBMS_AQ.REMOVE;
dequeueOpt.MSGID := msgid;
DBMS_AQ.DEQUEUE (
queue_name => 'STADMIN.'|| cola,
dequeue_options => dequeueOpt,
message_properties => message_properties,
payload => message,
msgid => msgid);
a:=a+1;
end if;
dbms_output.put_line(a);
exception
WHEN next_trans THEN
dequeueOpt.navigation := DBMS_AQ.NEXT_TRANSACTION;
WHEN no_messages THEN
dbms_output.put_line(sqlerrm);
newMess := FALSE;
end;
end loop;
end str_clean_queue;

Hello,
as you wrote you already have a code snippet with DBMS_AQ.DEQUEUE of an exception queue.
Wrap this DEQUEUE in an infinite loop (LOOP ... END LOOP). In order to have this procedure as an autonomous session
you can start it as a database job:
DECLARE
   v_jobno NUMBER(6);
BEGIN
    DBMS_JOB.SUBMIT( v_jobno,
                    'BEGIN <your module>; END;',
                    SYSDATE, NULL );
    COMMIT;
END;
/Kind regards,
WoG

How to pick(or consume) messages from Woblogic JMS Queue only when DB is UP

Hi,
I have a requirement to pick(or consume) messages from Woblogic JMS Queue only when DB is UP.
When DB is down, messages should remain in queue. When DB is up, messaged should be picked on scheduler basis.
We are using SOA suite 11g(BPEL or mediator,JMS Adapter).
What is the best way to achive it in SOA 11g.
I tried, but when I setup a Consumer, there is no control over there. Messages are picked automatically.
Please advise.
Thanks
Ram

something wrong with the design.
why dont you set the retry options in the fault policies?
So if the external DB is down you could reprocess them after specified interval or make it go to human retry queue.
Then you could use SOA api to retry all of them.
--Prasanna

Dequeue from Advanced Queue

Hi All,
I have used the DBMS_AQ package provided dequeue functionality for dequeuing msgs from my advanced queue. Now there is a job which dequeue the items from this queue and sends out email. Now what is happening is the job picks up an item from the advanced queue for dequeuing and sends out email, but the item which is picked up still remains in the queue and is not dequeued. As the job runs every minute and polls the queue, it again picks up the same queue item and sends the email. This process repeats for 5-6 times and then the queue message expires. My requirement is that, the job should dequeue the item from the queue and just send email once. Please can anyone suggest what could be the solution to this problem?

10g is not a version number it is a marketing label that applies equally to 10.1.0.2 and 10.2.0.4 and a lot of versions in between.
That said I know this demo I wrote works in all versions of 10.2:
http://www.psoug.org/reference/aq_demo1.html
Compare it to what you are doing.

Any way t read a message from a Queue without actually removing it

Hello friends,
Can anyone please tell me , is there any way to read contents of TextMessage from a Queue, without actually removing it from Queue using receive method

You can use a QueueBrowser to get an Enumeration of the messages in the queue.

Creating job to listen to single consumer queue

i have code that will allow a job to listen on a queue for a mulitple consumer queue but was wondering how to change it for a single consumer queue. The code i currently have for the multiple conusmer looks like this
     DBMS_SCHEDULER.DEFINE_METADATA_ARGUMENT(
          program_name => 'P_ToDBlocking_Implement'
          ,argument_position => 1
          ,metadata_attribute => 'EVENT_MESSAGE'
     dbms_scheduler.enable('P_ToDBlocking_Implement');
     DBMS_SCHEDULER.CREATE_EVENT_SCHEDULE (
          schedule_name =>      'S_ToDBlocking_Implement'
          ,start_date =>      systimestamp
          ,event_condition => 'corrid=''NOTIFY'''
          ,queue_spec => 'event_msg_q');
Maybe i am thinking about this wrong how could i get a consumer in a single consumer queue to listen to the queue and process all queue that come in?
Edited by: user457357 on Sep 12, 2008 12:19 AM

Why don't you step back, post your full version number, and explain what the business process is. In other words what it is you are trying to achieve.
When discussing business processes you don't write code. You don't name methodologies. You say things like.
An end user adds a new row into a table and when that happens I want a job to run .... or something like that.
Without a context any answer is pure guesswork.

Dequeue from multi consumer queue without consumer_name

Similar Messages

Maybe you are looking for