Queries on Advanced Queuing in Oracle Database

Hi All,
We are new to Advanced Queuing.
We have a requirement wherein we need to implement Oracle AQ.
However upon some R&D, we got the basic idea of AQ.
But we would like to know on a broad level,
i.     The Purpose of enabling/Using AQ
ii.     Basic understanding on the different components of AQ like Creating Payload, Enqueue, Dequeue messages
iii.     Some high level understanding of the API’s – Which to use when and the purpose
iv.     Challenges faced
v.     Possible issues and Resolutions.
If anyone can help us with the above questions, it would be of great help.
Regards,
Shruti

Michael Ferrante (Oracle) wrote:
Enable at least level 2 tracing in the console. You should see an exchange occur every 2 seconds (2000ms). If you do not see this then your MAX_WAIT is not being read. To enable trace level 2, open the console and left click in the text area of it. Then press the number 2 on the keyboard just above the letters Q and W. Do not use the number pad, as this will not work.If enable Level 2 in JavaConsole, nothing is written there. However, when the level 3, then every 2 seconds is displayed in the console this line:
network: Connecting http://localhost:7001/forms/lservlet;jsessionid=LvhyQ0QNg5KkJ17vnch3pQSMT6Z00B16yVr7m64npFKTKp1pBBjv!656070063 with proxy=DIRECTI changed the file formsfeb.cfg, set MaxEventWait = 5000. All restart, And a similar message is displayed every 5 seconds in the console.
network: Connecting http://localhost:7001/forms/lservlet;jsessionid=r31zQ0TLpHxK3kjBqMBk0tvYf9hn6wn6sGpKRppTvSX1f70pv0GS!571608984 with proxy=DIRECT
network: Connecting http://localhost:7001/ with proxy=DIRECT

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Enable at least level 2 tracing in the console. You should see an exchange occur every 2 seconds (2000ms). If you do not see this then your MAX_WAIT is not being read. To enable trace level 2, open the console and left click in the text area of it. Then press the number 2 on the keyboard just above the letters Q and W. Do not use the number pad, as this will not work.If enable Level 2 in JavaConsole, nothing is written there. However, when the level 3, then every 2 seconds is displayed in the console this line:
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Hi,
We want to use Oracle Advance Queuing to send a message from a source Database (transactional) to a Reporting database
On a particular event on a record in the source database, we want to enqueue the record's code on a Queue in the target database, where the dequeuing will happen and some processing will take place for each code retrieved.
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I like your suggestion of having one queue, it keeps the infrastruture simple.
Have I got the option of having this single queue either at the source or the target DB?
Maybe let me summarise more precisely what I am trying to achieve: we want to copy a complex data structure on the Source DB to a simplified/flatter data structure on the reporting DB.
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2. Queue at the source DB. Source DB enqueues message locally, an application on the target DB dequeues the message and the procedure (at target) reads from the source with DB link and writes the new data to the target DB.
3.Queue at the source DB. Source DB enqueues message locally, an application on the source DB dequeues the message and the procedure (at source) reads data from the source and writes the new data to the target using a DB link
3. seems having the most impact on performance of the source db?
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Thanks
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We would like to connect two queues that reside in different database schemas/instances.
We try to use the propagation feature of Oracle to achieve this.
The queue-type is the same for both queues.
Enqueuing is done with a recipient list in order to set multiple local subscribers for the messages that are put onto the queue.
We would like to propagate between queues without changing the applications that write to originating queue and the other applications that read from the target queue.
During our research we only found ways where we need to change the application that writes onto the queue, which is not acceptable for us. Also the list of subscribers needs to be different based on the message.
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cheaply for evaluation is to download the NT version. I'm
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to
: get around.
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: Regards,
: Christian
null

Oracle Advanced Queuing - Propagation problem - 11g

Hi,
I have a problem when propagation messages between queues. When the message is propagated, it stays on the source queue with READY state.
I have created two queues on 11g with a propagation rule that any message from queue A are sent to queue B. My problem is that the message from the source queue stays in the source queue even after propagation, which isn't what I was expecting. The problem doesn't occur if the queues are on a different database. This problem only happens if the queues are on the same database.
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create type EVENT_MESSAGE as object (
eventsource VARCHAR2(30),
eventname VARCHAR2(255),
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For USERA
create type EVENT_MESSAGE as object (
eventsource VARCHAR2(30),
eventname VARCHAR2(255),
eventid NUMBER(19,0),
message CLOB
BEGIN
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max_retries => 5
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dbms_aqadm.start_queue('SOURCE');
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queue_to_queue => true);
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When I enqueue a message to the source on USERA with this:
declare
rc binary_integer;
nq_opt dbms_aq.enqueue_options_t;
nq_pro dbms_aq.message_properties_t;
datas EVENT_MESSAGE;
msgid raw(16);
begin
nq_pro.expiration := dbms_aq.never;
nq_pro.sender_id := sys.aq$_agent('ENQUEUE_AGENT', null, null);
datas := AGEAS_EVENT_MESSAGE('message','eventname',1,null);
dbms_aq.enqueue('SOURCE',nq_opt,nq_pro,datas,msgid);
end;
The message is propagated to the destination queue, no problem, but the message state on the source queue is kept as ready. I would have expected it to be marked as processed and disappear from the queue table.
When I look at the AQ$_SOURCE_QUEUE_TABLE_S the I see these records:
     QUEUE_NAME     NAME     ADDRESS     PROTOCOL      SUBSCRIBER TYPE
     SOURCE     (null)     "USERB"."DESTINATION"@AQ$_LOCAL     0     1736
     SOURCE     DEQUEUE_AGENT     "USERB"."DESTINATION"     0     577
Can anyone help?

I was talking about following oracle documentations:
Oracle Database 11g: Advanced Queuing (Technical Whitepaper)
Streams Advanced Queuing: Best Practices (Technical Whitepaper)
Oracle Streams Advanced Queuing and Real Application Clusters: Scalability and Performance Guidelines (Technical Whitepaper)
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at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
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at junit.framework.TestSuite.run(TestSuite.java:203)
at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:128)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
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Oracle advanced queuing

Hi,
I am new to Oracle Advanced queuing. I have a question.
After enqueue operation, the message can be retrieved by dequeue operation.
But, why do we need SCHEDULE_PROPAGATION ?
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Thanks,
Message was edited by:
user448390

Do we use that when we are sending it to a totally
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Hope this will help..
Thanks

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Post the stack trace

Queries on Advanced Queuing in Oracle Database

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