Plsql callback (dbms_aq.register) stops working

we had, for quite a while, a working situation where a incoming message notifies a plsql procedure, which dequeues and handles the message, resulting in a response message in a different queue
the queue has one subscriber and through dbms_aq.register I registered a plsql callback and all worked fine for about a year
suddenly this stopped working - messages aren't dequeued anymore - for no apparent reason (nothing changed in this part of the database)
I already dropped and recreated the queue table, queues, subscriptions and registered the plsql callback again, but no results
does anyone have a clue where to look (specific sys tables/views, database parameters etc) because I am running out of ideas...
we are running the 10.2.0.1.0 database
greatings
Jan

Jan,
The EMNO (Event Monitor) process is responsible to execute the AQ notifications, in this case your pl/sql callback. This may or may not be your problem. I'm not sure how much help this link will be but it covers Event Monitor issues for various versions of Oracle. https://metalink.oracle.com/metalink/plsql/f?p=130:14:2721106654994549115::::p14_database_id,p14_docid,p14_show_header,p14_show_help,p14_black_frame,p14_font:NOT,105067.1,1,1,1,helvetica
Jason

Similar Messages

Are DBMS_AQ.REGISTER callbacks functional on Oracle XE?

I'm trying to get callbacks for oracle streams to work on ORACLE XE. I'd like to be able to perform a
demo of using JMS to fire a pl/sql procedure. There are a million other ways of doing this, I'm sure.
The idea is to enqueue a message and have the callback fire off. The call back is created using DBMS_AQ.REGISTER
All I seem to get is the messages in thetopic/queue, and they don't go anywhere, my procedure is not called.
I fixed up my XE instance to support JMS data types.
Below is the code that I've used so far. The aq_tm_processes value is 1 and the
job_queue_processes is 10. I've called START_TIME_MANAGER for what that's worth.
I'm missing something or XE can't do this, any help appreciated.
=================================
grant connect, resource, aq_administrator_role to jmsuser identified by jmsuser;
grant execute on sys.dbms_aqadm to jmsuser;
grant execute on sys.dbms_aq to jmsuser;
grant execute on sys.dbms_aqin to jmsuser;
grant execute on sys.dbms_aqjms to jmsuser;
exec dbms_aqadm.grant_system_privilege('ENQUEUE_ANY','jmsuser');
exec dbms_aqadm.grant_system_privilege('DEQUEUE_ANY','jmsuser');
CREATE ROLE my_aq_adm_role;
grant connect, resource, aq_administrator_role to my_aq_adm_role;
CREATE ROLE my_aq_user_role;
GRANT aq_user_role to my_aq_user_role ;
GRANT my_aq_user_role to jmsuser;
dbms_aqadm.create_queue_table(
queue_table => 'test_topic_table',
comment => 'test topic_table',
multiple_consumers => TRUE,
compatible => '9.0.0',
Queue_payload_type => 'SYS.AQ$_JMS_TEXT_MESSAGE',
message_grouping => DBMS_AQADM.TRANSACTIONAL );
DBMS_AQADM.CREATE_QUEUE (Queue_name => 'jmsuser.test_topic',
queue_type => DBMS_AQADM.NORMAL_QUEUE,
max_retries => 3,
retry_delay => 3,
retention_time => 0,
comment=>'test queue',
auto_commit =>TRUE,
Queue_table => 'jmsuser.test_topic_table');
DBMS_AQADM.START_QUEUE (Queue_name => 'jmsuser.test_topic');
DBMS_AQADM.ADD_SUBSCRIBER (
queue_name => 'test_topic',
subscriber => SYS.AQ$_AGENT(
'test_topic_subscriber',
'jmsuser.test_topic',
NULL )
DBMS_AQ.REGISTER (
SYS.AQ$_REG_INFO_LIST(
SYS.AQ$_REG_INFO(
'test_topic:test_topic_subscriber',
DBMS_AQ.NAMESPACE_AQ,
'plsql://JMSUSER.TOPIC_CALLBACK',
HEXTORAW('FF')
1
create or replace PROCEDURE TOPIC_CALLBACK
context RAW,
regInfo SYS.AQ$_REG_INFO,
descr SYS.AQ$_DESCRIPTOR,
payload SYS.AQ$_JMS_TEXT_MESSAGE,
-- payload raw,
payload1 number )
AS
r_dequeue_options DBMS_AQ.DEQUEUE_OPTIONS_T;
r_message_properties DBMS_AQ.MESSAGE_PROPERTIES_T;
v_message_handle RAW(16);
my_info VARCHAR2(4000);
o_payload SYS.AQ$_JMS_TEXT_MESSAGE;
BEGIN
r_dequeue_options.msgid := descr.msg_id;
r_dequeue_options.consumer_name := descr.consumer_name;
DBMS_AQ.DEQUEUE( queue_name => descr.queue_name,
dequeue_options => r_dequeue_options,
message_properties => r_message_properties,
payload => o_payload,
msgid => v_message_handle );
o_payload.get_text(my_info) ;
INSERT
INTO jmsuser.aq_info_table
MESSAGE
VALUES
'Message ['
|| trim(my_info)
|| '] '
|| 'dequeued at ['
|| TO_CHAR( SYSTIMESTAMP, 'DD-MON-YYYY HH24:MI:SS.FF3' )
|| ']'
COMMIT;
END TOPIC_CALLBACK;

I'm trying to get callbacks for oracle streams to work on ORACLE XE. I'd like to be able to perform a
demo of using JMS to fire a pl/sql procedure. There are a million other ways of doing this, I'm sure.
The idea is to enqueue a message and have the callback fire off. The call back is created using DBMS_AQ.REGISTER
All I seem to get is the messages in thetopic/queue, and they don't go anywhere, my procedure is not called.
I fixed up my XE instance to support JMS data types.
Below is the code that I've used so far. The aq_tm_processes value is 1 and the
job_queue_processes is 10. I've called START_TIME_MANAGER for what that's worth.
I'm missing something or XE can't do this, any help appreciated.
=================================
grant connect, resource, aq_administrator_role to jmsuser identified by jmsuser;
grant execute on sys.dbms_aqadm to jmsuser;
grant execute on sys.dbms_aq to jmsuser;
grant execute on sys.dbms_aqin to jmsuser;
grant execute on sys.dbms_aqjms to jmsuser;
exec dbms_aqadm.grant_system_privilege('ENQUEUE_ANY','jmsuser');
exec dbms_aqadm.grant_system_privilege('DEQUEUE_ANY','jmsuser');
CREATE ROLE my_aq_adm_role;
grant connect, resource, aq_administrator_role to my_aq_adm_role;
CREATE ROLE my_aq_user_role;
GRANT aq_user_role to my_aq_user_role ;
GRANT my_aq_user_role to jmsuser;
dbms_aqadm.create_queue_table(
queue_table => 'test_topic_table',
comment => 'test topic_table',
multiple_consumers => TRUE,
compatible => '9.0.0',
Queue_payload_type => 'SYS.AQ$_JMS_TEXT_MESSAGE',
message_grouping => DBMS_AQADM.TRANSACTIONAL );
DBMS_AQADM.CREATE_QUEUE (Queue_name => 'jmsuser.test_topic',
queue_type => DBMS_AQADM.NORMAL_QUEUE,
max_retries => 3,
retry_delay => 3,
retention_time => 0,
comment=>'test queue',
auto_commit =>TRUE,
Queue_table => 'jmsuser.test_topic_table');
DBMS_AQADM.START_QUEUE (Queue_name => 'jmsuser.test_topic');
DBMS_AQADM.ADD_SUBSCRIBER (
queue_name => 'test_topic',
subscriber => SYS.AQ$_AGENT(
'test_topic_subscriber',
'jmsuser.test_topic',
NULL )
DBMS_AQ.REGISTER (
SYS.AQ$_REG_INFO_LIST(
SYS.AQ$_REG_INFO(
'test_topic:test_topic_subscriber',
DBMS_AQ.NAMESPACE_AQ,
'plsql://JMSUSER.TOPIC_CALLBACK',
HEXTORAW('FF')
1
create or replace PROCEDURE TOPIC_CALLBACK
context RAW,
regInfo SYS.AQ$_REG_INFO,
descr SYS.AQ$_DESCRIPTOR,
payload SYS.AQ$_JMS_TEXT_MESSAGE,
-- payload raw,
payload1 number )
AS
r_dequeue_options DBMS_AQ.DEQUEUE_OPTIONS_T;
r_message_properties DBMS_AQ.MESSAGE_PROPERTIES_T;
v_message_handle RAW(16);
my_info VARCHAR2(4000);
o_payload SYS.AQ$_JMS_TEXT_MESSAGE;
BEGIN
r_dequeue_options.msgid := descr.msg_id;
r_dequeue_options.consumer_name := descr.consumer_name;
DBMS_AQ.DEQUEUE( queue_name => descr.queue_name,
dequeue_options => r_dequeue_options,
message_properties => r_message_properties,
payload => o_payload,
msgid => v_message_handle );
o_payload.get_text(my_info) ;
INSERT
INTO jmsuser.aq_info_table
MESSAGE
VALUES
'Message ['
|| trim(my_info)
|| '] '
|| 'dequeued at ['
|| TO_CHAR( SYSTIMESTAMP, 'DD-MON-YYYY HH24:MI:SS.FF3' )
|| ']'
COMMIT;
END TOPIC_CALLBACK;

Help. plsql callback of a jms message. Not working

had examples of AQ working in my 10g r2 database using simple queues.
however my problem is I want to use a jms queue. I can enqueue onto it all the time but it never notifies my subscriber and I am drawing a blank. Can anyone help me? Thanks in advance.
Using the example below the data just sits in the queue for ever.
Here is the example assuming installing into oracle user : demo.
begin
dbms_aqadm.create_queue_table
(Queue_table => 'jms_message'
,Queue_payload_type => 'sys.aq$_jms_message'
,multiple_consumers => true
,comment => 'demo queue table'
dbms_aqadm.create_queue
(queue_name => 'jms_message_request',
queue_table => 'jms_message');
dbms_aqadm.start_queue
(queue_name => 'jms_message_request');
end;
drop table demo_data;
drop sequence s_demo_data_id;
create table demo_data
(id number(10)
,stuff varchar2(2000)
create sequence s_demo_data_id;
create or replace procedure plsql_subscriber
(context raw,
reginfo sys.aq$_reg_info,
descr sys.aq$_descriptor,
payload sys.aq$_jms_message,
payloadl number
) is
dequeue_options dbms_aq.dequeue_options_t;
message_properties dbms_aq.message_properties_t;
message_handle RAW(16);
message sys.aq$_jms_message;
v_stuff demo_data.stuff%type;
begin
dequeue_options.msgid := descr.msg_id;
dequeue_options.consumer_name := descr.consumer_name;
dbms_aq.dequeue(queue_name => 'JMS_MESSAGE_REQUEST',
dequeue_options => dequeue_options,
message_properties => message_properties,
payload => message,
msgid => message_handle);
v_stuff:=
'Type: ' || message.get_type ||
' UserId: ' || message.get_userid ||
' AppId: ' || message.get_appid ||
' GroupId: ' || message.get_groupid ||
' GroupSeq: ' || message.get_groupseq;
insert into demo_data values ( s_demo_data_id.nextval,v_stuff);
commit;
end;
-- ADD plsql SUBSCRIBERS AND REGISTER THE QUEUES
prompt -- create subscriber
declare
o_agent sys.aq$_agent;
begin
o_agent:=new sys.aq$_agent
(name => 'SUBSCRIBER1'
,address => null
,protocol=> null
dbms_aqadm.add_subscriber
(queue_name => 'jms_message_request'
,subscriber => o_agent
,rule => null
end;
declare
t_reg_list sys.aq$_reg_info_list;
o_reg_info sys.aq$_reg_info;
begin
-- note as this is a multi consumer q we need the name to be in the format schema.queue:consumer_name
o_reg_info:=new sys.aq$_reg_info
(name =>'demo.jms_message_request:subscriber1'
,namespace =>dbms_aq.namespace_aq -- ie AQ streams
,callback => 'plsql://demo.plsql_subscriber'
,context => hextoraw('FF')
t_reg_list:=new sys.aq$_reg_info_list();
t_reg_list.extend();
t_reg_list(1):=o_reg_info;
/* -- note this suffers from oracle bug : 'count' is a reserved word and use of such a keyword causes this error
-- when using a procedure call in PL/SQL.
-- This is resolved by the fix for Bug 3966513 which will be in 10g Release 2.
-- see below for fix
dbms_aq.register
(reg_list => t_reg_list
,count => 1);
dbms_aq.register(t_reg_list,1);
commit;
end;
DECLARE
id pls_integer;
agent sys.aq$_agent;
map_message sys.aq$_jms_map_message;
message sys.aq$_jms_message;
enqueue_options sys.dbms_aq.enqueue_options_t;
message_properties sys.dbms_aq.message_properties_t;
msgid raw(16);
BEGIN
agent:= new sys.aq$_agent
(name=>'producer' -- name of the producer
,address=>null -- return address
,protocol=>0 -- 0 default
-- Consturct a empty map message object
map_message := sys.aq$_jms_map_message.construct;
-- Shows how to set the JMS header
map_message.set_replyto(agent);
map_message.set_type('myType');
map_message.set_userid('me');
map_message.set_appid('plsql_enq');
map_message.set_groupid('myGroup');
map_message.set_groupseq(1); -- is this messing it up
-- Shows how to set JMS user properties
id := map_message.clear_body(-1);
map_message.set_string(id, 'STRING', 'Hello World!');
map_message.flush(id);
sys.aq$_jms_map_message.clean_all();
message := sys.aq$_jms_message.construct(map_msg=>map_message);
dbms_aq.enqueue(
queue_name => 'jms_message_request',
enqueue_options => enqueue_options,
message_properties => message_properties,
payload => message,
msgid => msgid);
commit;
end;
/

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Confused?

Registered plsql callback not notified

Oracle Database 10g Enterprise Edition Release 10.2.0.3.0
Production system: Two-instance RAC
Testing system: Single instance
I have a PL/SQL procedure registered through DBMS_AQ.REGISTER to be notified when messages come in on a particular queue. While it works in test, it is never called in production.
I have checked that the messages are enqueued correctly. There are no messages in the associated exception queue. There do not seem to be any trace files associated with this failed notification.
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What can I do next?

Looks like we found it...
This is TEST:
create or replace
TYPE     aq$_descriptor AS OBJECT (
        queue_name       VARCHAR2(65),                -- name of the queue
        consumer_name    VARCHAR2(30),                -- name of the consumer
        msg_id           RAW(16),                     -- message identifier
        msg_prop         msg_prop_t,                  -- message properties
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        consumer_name    VARCHAR2(30),                -- name of the consumer
        msg_id           RAW(16),                     -- message identifier
        msg_prop         msg_prop_t)                  -- message properties
ALTER TYPE     aq$_descriptor
ADD ATTRIBUTE(gen_desc sys.aq$_ntfn_descriptor)
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Dequeuing multiples messages in a PLSQL CallBack

Hi all:
I would like to dequeue multiples messages in a PLSQL CallBack for performance reason.
Everything works fine, but I see that Oracle AQ sent the rest of the notifications messages to the callback independent of an empty queue.
I added a table lock to prevent parallel execution of the Call Back, but when this resource lock is freed, many oracle processes are started in parallel to process the rest of the notification pending.
Here my Call Back:
static procedure msgCallBack(context IN RAW,
                               reginfo IN SYS.AQ$_REG_INFO,
                               descr    IN SYS.AQ$_DESCRIPTOR,
                               payload IN RAW,
                               payloadl IN NUMBER) is
    dequeue_options     dbms_aq.dequeue_options_t;
    message_properties dbms_aq.message_properties_t;
    message_handle      RAW(16);
    message             lucene_msg_typ;
    prefix              VARCHAR2(4000) := utl_raw.cast_to_varchar2(context);
    rcount              NUMBER;
    begin
      EXECUTE IMMEDIATE 'LOCK TABLE '||prefix||'$T IN EXCLUSIVE MODE';
      EXECUTE IMMEDIATE 'select count(*) from '||prefix||'$QT' INTO rcount;
      if (rcount >0) then
        sync(prefix); -- dequeue all messages
      end if;
      commit;
end msgCallBack;
sync(prefix) dequeues all messages pending on the queue, if statement is to avoid non-necessary call to sync procedure on an empty queue.
Is there any way to clean up all pending notification inside a Call Back?
I'll appreciate any help on this topic.
Best regards, Marcelo.

Hi Marcelo,
If you do a dequeue with dequeue_options.wait=dbms_aq.forever it will wait until the message is enqueued. It is not consuming (much) cpu-time. AQ solves this under water for you by polling the queue-table.
If you schedule this job with an interval of say 10secs (using dbms_job or dbms_scheduler) the job will come up after database startup. The only other option is to start the process using a sqlplus or similar tool. But since the dequeueu will wait for the next incomming message the sqlplus session will halt. Using the jobscheduler in the database causes the job to be run in a session with in the database (so you get your session freed) and after a database restart, the job will come up.
You can use this with a normal default queue. You should not use the dequeue_option visibility=dbms_aq.immediate, because then you loose your "transactional grouping".
I'd advise to either
. not use wait=dbms_aq.forever, but a reasonable amount of wait time and then let your job run to complete. Then the job scheduler can reschedule the process in an interval of for example 1 - 10 sec.
. do use wait=dbms_aq.forever but define a kind of "suicide pill". That is a message that you give a special meaning for example a correlation-id with a special text, and the highest possible priority. You have to make sure that it by passes every other message-priority. If the process gets this message it has to stop.
The reason I advise eiter of them is that you want a means of stopping the process in a neat fashion. For example for maintenance purposes. I personally have a slight prefrence for the first option, because when you remove the job from the jobscheduler you may trust that the job stops. For the second option you have to rely on the process receiving and consuming the suicide pill. But it is manner of taste: the second option is also a good way. The first option introduces a possible latency since the job is regularly not executing for a few seconds. The second gives the best response I think.
Regards,
Martien

PL/SQL notification / DBMS_AQ.REGISTER

There have been a number of discussions on this forum about PL/SQL notifications. I'm running
into the same problem:
- create the notification procedure
- register the procedure
- enqueue a message
- NOTHING HAPPENS
It seems that the notification procedure is not executed.
The discussions on this forum were all inconclusive. Did anybody get this to work? If yes, can
you post an example (i.e. a script that creates the queue, create the procedure, registers the
procedure and enqueues a message)?
Is there a table/view that contains the registrations?
What system parameters are relevant to this functionality?
Where are errors in calling the notification procedure logged?

There are few problems that I can see with your code.
Your callback procedure header should look like this:
create or replace procedure QCallBack1(
context RAW,
reginfo SYS.AQ$_REG_INFO,
descr SYS.AQ$_DESCRIPTOR,
payload VARCHAR2,
payloadl NUMBER) is
BEGIN
END ;
And your callback notification does not include the name of the QUEUE subscriber. The first parameter
to the AQ$_REG_INFO should be of this format: <QUEUE ADMIN>.<QUEUE_NAME>:<QUEUE SUBSCRIBER>
When you say this:
sys.aq$_reg_info('myprofile.Que1',dbms_aq.namespace_aq, 'plsql://myprofile.QCallBack1', hextoraw('FF'));
You are not putting the name of the queue subscriber into the first parameter.
Also, Your callback notification URL must be like this:
'plsql://<user containing the callback proc>.<name of the callback proc>?PR=1'
Note that if the callback procedure is in another schema, you must grant EXECUTE priv. to the user
where the QUEUE has been setup.
Hallo,
I have got the same problem as Erwin Groenendal. I wrote single user que and procedures to enque and deque as simple as I can do.
pseudocode:
1. create and start que - no error
2. create proc for callback in pl/sql - no error
3. register callback - no error
4. enque message - noerror (no callback called)
5. deque message - noerror
in callback procedure I am writing into my own table with one varchar2 column to determine if the callback was processed.
My register procedure looks like: (pseudocode point 3)
procedure Register
is
XRegProc sys.aq$_reg_info;
XRegList sys.aq$_reg_info_list;
begin
XRegProc := sys.aq$_reg_info('myprofile.Que1', dbms_aq.namespace_aq, 'plsql://myprofile.QCallBack1', hextoraw('FF'));
XRegList := sys.aq$_reg_info_list(XRegProc);
dbms_aq.register(XRegList, 1);
end;
in definition variable XRegProc I tryed all possibilities like:
'plsql://myprofile.QCallBack1'
'plsql://myprofile.QCallBack1?PR=0'
'plsql://QCallBack1'
'plsql://myprofile.QCallBack1'
and so on.
The Callback looks like:
procedure QCallBack1(
context out raw,
reginfo out sys.aq$_reg_info,
descr out sys.aq$_descriptor,
payload out raw,
payloadl out number)
is
begin
insert into MyOwnTable (my_text) values ('Message notification callback called.');
commit;
end;
with compilation i have not problems. I am running oracle 9i release 2.
the enque procedure looks like:
procedure put(
APayload in raw,
ACorrelation in varchar2)
is
XEnq_opts dbms_aq.enqueue_options_t;
XMsg_props dbms_aq.message_options_t;
XMsg_id raw(16);
begin
XMsg_props.correlation := ACorrelation;
dbms_aq.enqueue('Que1', XEnq_opts, XMsg_props, APayload, XMsg_id);
commit;
end;
All rights are corectly sets under SYSTEM user.
Please help somebody why it does not work. I not see problem byt I need to call some procedure when new message arive into que. I need to have paralel process, I can not solve it with loops and so on.
Thanks for every ideas. In next week I can show you source code. Today I can not.
Regards, Zdenek.
For Oracle9i and above DBMS_AQ.REGISTER can be used for PL/SQL callback notification.
If running earlier version of Oracle, use DBMS_AQ.LISTEN to get a similar functionality.
It depends upon the URL that you specify while registering, that decides if callback will be executed or
not.
If you post the code fragment(s) of how you created the notification procedure and how you registered it,
maybe we can look to see if it is correct.
There have been a number of discussions on this forum about PL/SQL notifications. I'm running
into the same problem:
- create the notification procedure
- register the procedure
- enqueue a message
- NOTHING HAPPENS
It seems that the notification procedure is not executed.
The discussions on this forum were all inconclusive. Did anybody get this to work? If yes, can
you post an example (i.e. a script that creates the queue, create the procedure, registers the
procedure and enqueues a message)?
Is there a table/view that contains the registrations?
What system parameters are relevant to this functionality?
Where are errors in calling the notification procedure logged?

AQ Propagation Notifications/PLSQL Callback Query?

I have the following scenario working but have a question:
I have two databases, I Enqueue a message onto a Queue in Database 1 and scheduling Propagation to a Queue in Database 2.
In Database 2 the queue has a PL/SQL procedure registered (using DBMS_AQ.Register) so that as the propagated message arrives it calls the procedure which dequeues it and saves the message to the Table.
It is all working fine, except that the Dequeue process on Database 2 seems to get invoke after approx 5 mins after it is Enqueued. SO you can see the message on the Subscribing Queue with an Enqueue Time, and it seems to always be about 5 mins later till the procedure is kicked off to dequeue it.
How do you set the time that it takes to dequeue the message?
There are no parameters on the DBMS_AQ_Register proc to set this.
I can't find anything in the docs?
I originally had a demo setup using PL/SQL callback on a local Queue (without propagation between two Databases) and the Dequeue was virtually instantaneous?
Regards
Stuart

Hello,
jobqueue_interval is not unsupported it is just hidden. In most cases the default is enough which is why it is hidden. As I recall the default is 5 seconds in 10.2 so it does not explain the 5 minute delay you are seeing. AQ only ever uses 1/2 the available job_queue_processes so if only 1 is available I would be surprised if it worked at all. Have you increased the number to 10?
There are no other ways to tune notification callbacks in any available version of Oracle that I am aware of.
Thanks
Peter

Where can i find plsql callback procedure error

I am using Oracle 11.2.0.3.
I have registered a callback procedure to my queue (point to point persistent message queue). Is the error from callback procedure stored somewhere?
I did see some entries to SYS.AQ_SRVNTFN_TABLE_1 , which is exception table for notification queue but it did not had ORA error of why my callback procedure failed?
DECLARE    reginfo    SYS.AQ$_REG_INFO;    reg_list SYS.AQ$_REG_INFO_LIST;
BEGIN    reginfo :=      sys.AQ$_REG_INFO ('NOTIFY_Q',                        DBMS_AQ.NAMESPACE_AQ,                        'plsql://sp_callback,                        HEXTORAW ('FF'));
reg_list := sys.AQ$_REG_INFO_LIST (reginfo);
DBMS_AQ.REGISTER (reg_list => reg_list, reg_count => 1);
COMMIT
; EXCEPTION
WHEN OTHERS    THEN
DBMS_OUTPUT.put_line (DBMS_UTILITY.FORMAT_ERROR_STACK);
END;
Thanks.

I want to know what error is thrown by call back procedure. Right now, only option i have is to log exception into a table. I wanted to know if oracle already logs the exception from callback procedure somewhere or if i can configure my callback to do so.

Plsql callback (dbms_aq.register) stops working

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