Use of AQ (Advanced Queuing) in OCCI

Hi,
Is there anybody that has used AQ with OCCI? There are some documentation provided in the Programmer's Guide for OCCI, but I'm not able to find a worked out example either in the Oracle site or the Web that demonstrates a complete setup and interaction with an AQ.
Thanks,
Espen

<rant>
Yeah, I was about to suggest sticking all the AQ interaction in a pl/sql package and passing around the XML as a Clob.
As you'll know XML is stored in Oracle either shredded into an O-R table, or as a CLOB. So you don't gain much by using an "XMLType" anyway.
Personally I detest XML and I'm the process of getting rid of it from everywhere I find it. Especially in AQ.
My thinking is you either
(1) care about the content, in which case you're better off passing around the actual data in actual types, mapped with OTT, or
(2) don't care about the content, in which case treat the XML as an atomic Clob.
It's not a fun game to have a Clob of XML in a an ANYDATA on an AQ. Where's the point I ask? Obey the Information Principle.
</rant>

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Using JMS and Advanced Queuing within forms.

I am wondering if anyone can forsee problems with embedding a javabean inside a form that:
listens to an Oracle queue.
Do you think there would be some type of problem with a connection factory trying to create a connection and a session from within forms using JDBC?
Thanks in advance

Sandu,you are right.
A Forms timer with status polling is a good and stabil solution .
But we are connected on a database and a polling of a database event - Job is finished, or a reply received in a Queue -
is always a network traffic and overhead when we use polling times < 1 min ..
It would be also a good solution and interesting feature of Forms that the database event sends a message to the waiting client (process ?) ..

Sample Message Driven Bean using Oracle Advance Queuing

Hi,
Can someone please provide me with sample MDB using Oracle Advance Queuing to Enqueue & Dequeue messages?
Thanks

Write your email Id .....I have got a test case which basically enqueus and dequeues the messages using Oracle9i AQ..
--Venky

ADVANCED QUEUE: USING JDBC CONNECTION -

Advanced Queue using the JDBC connection gives us AN ERROR WHEN SENDING 32K QUEUES
Is it true that RAW datatypes using the Java AQ API do indeed have a limit of 32K in 8.1.6.
The workaround is to use the Java AQ API with Object payloads (BLOBs) to get around the problem.
Has anyone used any other solution ?
Thanks
null

There's a JDBC forum that's probably more germane to this question-- I'd suggest reposting it there.
Justin Cave
ODBC Development

Advanced Queue - using the JDBC connection

Advanced Queue using the JDBC connection gives us AN ERROR WHEN SENDING 32K QUEUES
Is it true that RAW datatypes using the Java AQ API do indeed have a limit of 32K in 8.1.6.
The workaround is to use the Java AQ API with Object payloads (BLOBs) to get around the problem.
Has anyone used any other solution ?
Thanks
null

There's a JDBC forum that's probably more germane to this question-- I'd suggest reposting it there.
Justin Cave
ODBC Development

Can you use streams replication to replicate an advanced queue?

We need to be able to support failover of an Advanced Queue between a primary database instance and one or more alternate instances. To insure consitancy across the multiple-database instances, every enqueued and dequeued message must be replicated in the event of a failure on the primary node. TAF is used to automatically failover the App to an alternate database instance. Without getting into the details, Data Guard/Standby/RAC are NOT options.
Questions:
Is replication of an Advanced Queue supported via Streams Replication?
Are there guidlines/recommendations on how this should be done/setup?

No. AQ is not supported by Oracle Streams. User defined and Sys.AnyData are not supported types.
You can create AQ propagation process from source to backup site. But you will need to dequeue both sites simultaniously.
Or you can create schadow table (

Error when connect to Advanced Queuing Oracle

Dear sir,
I'm using intellij IDE write one a class java to connect Advanced Queuing, my code follow :
queueConnectionFactory = AQjmsFactory.getQueueConnectionFactory("host", "sid", 1521, "thin");
queueConnection = queueConnectionFactory.createQueueConnection("usernamer", "password");
but program have error : "Exception in thread "main" oracle.jms.AQjmsException: ORA-00604: error occurred at recursive SQL level 1
ORA-01882: timezone region not found".
I try connect this schema by "sql developer", i receive same error. i change file sqldeveloper.conf, put line - AddVMOption -Duser.timezone="+07:00" then sql developer work fine.
I download tzupdater-1.3.40-2011h and run "java -jar tzupdater.jar -u" and "java -jar tzupdater.jar -f" but app not run.
can you have me. i need complete this app.

Post the stack trace

Java advanced queue MDB class usage

Hello,
Loads of questions about JMS AQ and MDB.
I have not found anything that tells you how to use the oracle.jms classes within a MDB's directly. Do I just cast the message to a AQMessage and retrieve from there?
I have found plenty of documentation about using the oracle.jms classes. Ive found a lot of information about using advanced queues and enqueing and dequeuing to them in Java. I have found information about MDBs and how to use them as a regular service ie: using TextMessage
Is there a simple document describing MDB oracle AQ classes? I have looked through umpteen million Oracle documents to no avail.
Is there an interface for MDB in the Oracle AQ classes which has an onMessage() method which I can implement taking in oracle.jms classes?
When processing a message that I would like to put on another queue do I call the AQ classes to enqueue a message and set its attributes that way or do I use the JMS classes and their methods to do that?

http://download-west.oracle.com/docs/cd/A97688_12/generic.903/a97677/mdb.htm#1013265 should get me most of the way there.

Does the advanced queue support setting the pay load type as array/table?

Does the advanced queue support setting the pay load type as array/table?
if yes, how to write the enqueue script, I tried to write the following the script to enqueue, but failed, pls help to review it . Thanks...
------Create payload type
create or replace TYPE "SIMPLEARRAY" AS VARRAY(99) OF VARCHAR(20);
------Create queue table
BEGIN DBMS_AQADM.CREATE_QUEUE_TABLE(
Queue_table => 'LUWEIQIN.SIMPLEQUEUE',
Queue_payload_type => 'LUWEIQIN.SIMPLEARRAY',
storage_clause => 'PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 TABLESPACE USERS',
Sort_list => 'ENQ_TIME',
Compatible => '8.1.3');
END;
------Create queue
BEGIN DBMS_AQADM.CREATE_QUEUE(
Queue_name => 'LUWEIQIN.SIMPLEQUEUE',
Queue_table => 'LUWEIQIN.SIMPLEQUEUE',
Queue_type => 0,
Max_retries => 5,
Retry_delay => 0,
dependency_tracking => FALSE);
END;
-------Start queue
BEGIN
dbms_aqadm.start_queue(queue_name => 'LUWEIQIN.SIMPLEQUEUE', dequeue => TRUE, enqueue => TRUE);
END;
-------Enqueue
DECLARE
v_enqueueoptions dbms_aq.enqueue_options_t;
v_messageproperties dbms_aq.message_properties_t;
p_queue_name VARCHAR2(40);
Priority INTEGER;
Delay INTEGER;
Expiration INTEGER;
Correlation VARCHAR2(100);
Recipientlist dbms_aq.aq$_recipient_list_t;
Exceptionqueue VARCHAR2(100);
p_queue_name VARCHAR2(40);
p_msg VARCHAR2(40);
p_payload LUWEIQIN.SIMPLEARRAY;
BEGIN
p_payload(1) := 'aa';
p_payload(2) := 'bb';
SYS.DBMS_AQ.ENQUEUE(queue_name => 'LUWEIQIN.SIMPLEQUEUE',enqueue_options => v_enqueueoptions, message_properties => v_messageproperties, msgid => p_msg, payload => p_payload);
END;
------Get error
Error starting at line 1 in command:
DECLARE
v_enqueueoptions dbms_aq.enqueue_options_t;
v_messageproperties dbms_aq.message_properties_t;
p_queue_name VARCHAR2(40);
Priority INTEGER;
Delay INTEGER;
Expiration INTEGER;
Correlation VARCHAR2(100);
Recipientlist dbms_aq.aq$_recipient_list_t;
Exceptionqueue VARCHAR2(100);
p_queue_name VARCHAR2(40);
p_msg VARCHAR2(40);
p_payload LUWEIQIN.SIMPLEARRAY;
BEGIN
p_payload(1) := 'aa';
p_payload(2) := 'bb';
SYS.DBMS_AQ.ENQUEUE(queue_name => 'LUWEIQIN.SIMPLEQUEUE',enqueue_options => v_enqueueoptions, message_properties => v_messageproperties, msgid => p_msg, payload => p_payload);
END;
Error report:
ORA-06550: line 17, column 3:
PLS-00306: wrong number or types of arguments in call to 'ENQUEUE'
ORA-06550: line 17, column 3:
PL/SQL: Statement ignored
06550. 00000 - "line %s, column %s:\n%s"
*Cause: Usually a PL/SQL compilation error.
*Action:

but when I use the following script to enqueue get error. Pls help to review. Thanks...
DECLARE
v_enqueueoptions dbms_aq.enqueue_options_t;
v_messageproperties dbms_aq.message_properties_t;
p_queue_name VARCHAR2(40);
Priority INTEGER;
Delay INTEGER;
Expiration INTEGER;
Correlation VARCHAR2(100);
Recipientlist dbms_aq.aq$_recipient_list_t;
Exceptionqueue VARCHAR2(100);
p_queue_name VARCHAR2(40);
p_msg VARCHAR2(40);
p_payload LUWEIQIN.SIMPLEARRAY;
BEGIN
p_payload(1) := 'aa';
p_payload(2) := 'bb';
SYS.DBMS_AQ.ENQUEUE(queue_name => 'LUWEIQIN.SIMPLEQUEUE',enqueue_options => v_enqueueoptions, message_properties => v_messageproperties, msgid => p_msg, payload => p_payload);
END;
------Get error
Error starting at line 1 in command:
DECLARE
v_enqueueoptions dbms_aq.enqueue_options_t;
v_messageproperties dbms_aq.message_properties_t;
p_queue_name VARCHAR2(40);
Priority INTEGER;
Delay INTEGER;
Expiration INTEGER;
Correlation VARCHAR2(100);
Recipientlist dbms_aq.aq$_recipient_list_t;
Exceptionqueue VARCHAR2(100);
p_queue_name VARCHAR2(40);
p_msg VARCHAR2(40);
p_payload LUWEIQIN.SIMPLEARRAY;
BEGIN
p_payload(1) := 'aa';
p_payload(2) := 'bb';
SYS.DBMS_AQ.ENQUEUE(queue_name => 'LUWEIQIN.SIMPLEQUEUE',enqueue_options => v_enqueueoptions, message_properties => v_messageproperties, msgid => p_msg, payload => p_payload);
END;
Error report:
ORA-06550: line 17, column 3:
PLS-00306: wrong number or types of arguments in call to 'ENQUEUE'
ORA-06550: line 17, column 3:
PL/SQL: Statement ignored
06550. 00000 - "line %s, column %s:\n%s"
*Cause: Usually a PL/SQL compilation error.
*Action:

Propagation between queues in Oracle Advanced Queuing

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.
Therefore I have the following question:
- is there a way to set up propagation between queues in a way where we don't need to modify the sending application?
- if not, is there a different way to connect two queues via a subscriber/consumer?

Oracle8i for Linux does have AQ, although I haven't evaluated it
yet. If you're still having trouble with the install, make sure
you get the patch. A quicker and easier way to get Oracle8i up
cheaply for evaluation is to download the NT version. I'm
evaluating Oracle8i for both Linux and NT and the NT version is
more stable.
I would really appreciate hearing about your experiences with AQ
on Oracle8 (8.0.4.3). I have several projects that we have been
considering using AQ with. Please send me an email and tell me
what problems / work-arounds you found.
Christian Schroeder (guest) wrote:
: Hello,
: I still haven't managed to install 8i completely
: (files with zero-length, wrong permissions, wrong JVM, ...),
: anyway... -))
: We are using Oracle Advanced Queuing under 8.0.4.3 on AIX in
: a project at my company and I wondered if AQ is in 8i for
Linux?
: I really would like to evaluate it at home, since the AIX
: AQ version has some bugs and restrictions which I really need
to
: get around.
: My idea is to get 8i for AIX, but I wouldn't buy it if the
: queuing is still unstable.
: The 8.0.4 documentation states that one will get AQ in the
: Enterprise Edition with message-type 'RAW' and the Objects
Option
: will add full functionality if also purchased. I didn't find
: any comments on AQ in the installation guide.
: 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.
the script I use is this:
For USERB (which has the destination queue)
create type EVENT_MESSAGE as object (
eventsource VARCHAR2(30),
eventname VARCHAR2(255),
eventid NUMBER(19,0),
message CLOB
DECLARE
an_agent sys.aq$_agent;
BEGIN
-- create the publish/subscribe queue table
dbms_aqadm.create_queue_table(
queue_table => 'DESTINATION_QUEUE_TABLE',
queue_payload_type=>'EVENT_MESSAGE',
sort_list => 'ENQ_TIME',
message_grouping => DBMS_AQADM.NONE,
multiple_consumers=>true
-- create the queue
dbms_aqadm.create_queue(
queue_name => 'DESTINATION',
queue_table => 'DESTINATION_QUEUE_TABLE',
queue_type => DBMS_AQADM.NORMAL_QUEUE,
max_retries => 5
dbms_aqadm.create_aq_agent(agent_name =>'DEQUEUE_AGENT');
an_agent := sys.aq$_agent('DEQUEUE_AGENT', null, null);
dbms_aqadm.enable_db_access(
agent_name => 'DEQUEUE_AGENT',
db_username => 'USERB'
dbms_aqadm.add_subscriber(
queue_name => 'DESTINATION',
subscriber => an_agent,
queue_to_queue => FALSE,
delivery_mode => DBMS_AQADM.PERSISTENT
-- start the queues
dbms_aqadm.start_queue('DESTINATION');
END;
For USERA
create type EVENT_MESSAGE as object (
eventsource VARCHAR2(30),
eventname VARCHAR2(255),
eventid NUMBER(19,0),
message CLOB
BEGIN
-- create the publish/subscribe queue table
dbms_aqadm.create_queue_table(
queue_table => 'SOURCE_QUEUE_TABLE',
queue_payload_type=>'EVENT_MESSAGE',
sort_list => 'ENQ_TIME',
message_grouping => DBMS_AQADM.NONE,
multiple_consumers=>true
-- create the queue
dbms_aqadm.create_queue(
queue_name => 'SOURCE',
queue_table => 'SOURCE_QUEUE_TABLE',
queue_type => DBMS_AQADM.NORMAL_QUEUE,
max_retries => 5
-- start the queues
dbms_aqadm.start_queue('SOURCE');
-- create the propagation
dbms_aqadm.add_subscriber(queue_name => 'SOURCE',
subscriber => sys.aq$_agent('DEQUEUE_AGENT','USERB.DESTINATION',null),
queue_to_queue => true);
dbms_aqadm.schedule_propagation(queue_name => 'SOURCE',
start_time => sysdate,
latency => 25,
destination_queue => 'USERB.DESTINATION');
END;
When I enqueue a message to the source on USERA with this:
declare
rc binary_integer;
nq_opt dbms_aq.enqueue_options_t;
nq_pro dbms_aq.message_properties_t;
datas EVENT_MESSAGE;
msgid raw(16);
begin
nq_pro.expiration := dbms_aq.never;
nq_pro.sender_id := sys.aq$_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)
They are available at.. http://www.oracle.com/technetwork/database/features/data-integration/default-159085.html

Advanced Queues Snapshot too old error

I am using the advanced queues to submit work for parallel processes running through the Oracle Job Queue.
I have attempted running anywhere from 1 to 5 simultaneous processes (in addition the the process which submits them to the Oracle job queue and populates the advanced queues) and I am getting sporadic Snapshot too old errors when the other processes are attempting to dequeue. The Advanced queues are populated before the other processes are submitted to the job queue, so I don't see that there could be conflicts between one process enqueuing while another is dequeuing.
The reason I am attempting this is to try and gain some performance by running processes in parallel.
Has anyone else had problems like this? Is this a bug in Oracle 8.1.6? Is there a parameter setting I need to adjust? Are there any suggestions for getting around this problem?

I don't know what version of the database you are running? I'm only using 8.1.7.4. But where I come from, you add datafiles to the tablespace, not the rollback segment.
alter tablespace rollback
add datafile '<blah, blah>'
size 147m
autoextend on next 100m maxsize 2047m;
Make sure that you have a suitable number of rollback segments that are well-sized extents. But mostly, listen the Tom Best, and try and introduce some best practices (no pun intended) to reduce the likelihood of this situation arising.

Request for Comments and Experiences with Streams Advanced Queuing

Hi,
I would like to get some feedback about what your experiences with Streams Advanced Queuing. What do you like about it? What don't you like? How do you use it? What features would you love to see in it? Please post to the forums. Thanks!

I love the new homeless Instant Client! I wish we had it years ago. Some comments:
1) The MS ODBC administrator GPF's (blows up) when trying to configure a new data source using the new Oracle IC drivers. Have to hand-edit the registry.
2) I heartily agree with the request that the new client install without requiring the normal Oracle installer. It's just too bloated for easy deployment. I'd rather hand install the files than to have to use that. Also, .zip not .jar please.
3) Need better documentation on the connection string options. It took me 3 weeks to figure out that what used to be scott/tiger@mydb is now scott/[email protected]:1524/mydb.xxx.yyy (it's looking for the GLOBAL_NAME, not the SID and TNSPING won't show you that! Doh!)
4) Please let us specify a range of ports (e.g. :1521-1524) and let it figure out where the SID is on that machine. We move ours around and don't want to update hundreds of clients with hardcoded command lines.
5) Maximum backward compatibility, please! It's not easy moving all those Oracle apps to 8.1.7.4+ databases, yet, but my old OCI client programs should not have to care. I don't want to have 2 SQL*net driver stacks on my PC's.
Thanks -- I'll be watching for new features.

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.

Advanced Queuing in Oracle Forms

Hello! I'm trying to use the Advanced Queuing in Oracle Forms. I do it, that's for this manual:
http://st-curriculum.oracle.com/obe/forms/11g/formschataq/formschataq.htm
All objects created in the database successfully! However, in the section "Building the Forms Application to Interact with AQ", My form does not catch the event. Trigger WHEN-EVENT-RAISED in "Event" not called. The same thing happens when testing forms for chat.
Who have successfully used the "Advanced Queuing", tell me please, this example is correct? If no, can give a correct example? If yes, Maybe I did not set any settings?
I use Forms 1.1.2
Thank you!

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

Use of AQ (Advanced Queuing) in OCCI

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