Poster for the Notification of the Subscriber (dbms_aq.post) does not work as expected
Hello
I have the case study for the notification to the Subscriber specific QA that I had planned to use to send messages to the other sessions without subscriber . I just wanted to know feature QA POSITION.
Well I tried and google hours and reading documentation, but I can't figure out what I did wrong. There is not much information about this post method.
Expected result is a message in the my_queue_debug table, but there is nothing!
Any ideas where it's going?
Oracle 12 c EA
--NAME TYPE VALUE
--------------- ------- -----
--aq_tm_processes integer 1
--job_queue_processes integer 1000
--create user aq identified by aq
--;
--grant dba to aq
--;
--grant execute on dbms_aq to aq
--;
create table my_queue_debug(msg varchar2(100))
;
create type my_payload as object (msg varchar2(100));
/
set serveroutput on
begin
dbms_aqadm.create_queue_table('my_queue_table', 'my_payload', multiple_consumers=>true);
dbms_aqadm.create_queue('my_queue', 'my_queue_table');
dbms_aqadm.start_queue ('my_queue');
dbms_aq.register (
sys.aq$_reg_info_list(
sys.aq$_reg_info('my_queue:aq',
dbms_aq.namespace_anonymous,
'plsql://my_queue_callback',
hextoraw('FF')
)
), 1
);
end;
/
create or replace
procedure my_queue_callback(
context raw,
reginfo sys.aq$_reg_info,
descr sys.aq$_descriptor,
payload raw,
payloadl number
) as
l_options dbms_aq.dequeue_options_t;
l_properties dbms_aq.message_properties_t;
l_handle raw(16);
l_payload my_payload;
begin
l_options.msgid := descr.msg_id;
l_options.consumer_name := descr.consumer_name;
--
dbms_aq.dequeue(
queue_name => descr.queue_name,
dequeue_options => l_options,
message_properties => l_properties,
payload => l_payload,
msgid => l_handle
);
--
insert into my_queue_debug (
msg
) values (
l_payload.msg
);
commit;
end;
/
begin
dbms_aq.post(
sys.aq$_post_info_list(
sys.aq$_post_info(
'my_queue:aq',
dbms_aq.namespace_anonymous,
utl_raw.cast_to_raw( 'my message' )
)
), 1
);
end;
/
select user_data from aq$my_queue_table
;
select * from my_queue_debug
;
drop table my_queue_debug purge
;
begin
dbms_aqadm.stop_queue('my_queue');
dbms_aqadm.drop_queue('my_queue');
dbms_aqadm.drop_queue_table('my_queue_table');
end;
/
drop type my_payload
;
Table MY_QUEUE_DEBUG created.
Type MY_PAYLOAD compiled
PL/SQL procedure successfully completed.
Procedure MY_QUEUE_CALLBACK compiled
PL/SQL procedure successfully completed.
no rows selected
no rows selected
Table MY_QUEUE_DEBUG dropped.
PL/SQL procedure successfully completed.
Type MY_PAYLOAD dropped.
Hello
change your reminder of PL/SQL procedure, that it will only insert a line:
create or replace procedure my_queue_callback( context raw, reginfo sys.aq$_reg_info, descr sys.aq$_descriptor, payload raw, payloadl number ) as l_options dbms_aq.dequeue_options_t; l_properties dbms_aq.message_properties_t; l_handle raw(16); l_payload my_payload; begin insert into my_queue_debug ( msg ) values ( 'this is a test payload'); commit; end; /
Change the entry in the register of the recall without a consumer:
begin
dbms_aq.register (
sys.aq$_reg_info_list(
sys.aq$_reg_info('my_queue',
dbms_aq.namespace_anonymous,
'plsql://my_queue_callback',
hextoraw('FF')
)
), 1
);
end;
/
The unit test works now:
SQL> SQL> select * from my_queue_debug; no rows selected SQL> SQL> begin 2 3 dbms_aq.post( 4 sys.aq$_post_info_list( 5 sys.aq$_post_info( 6 'my_queue', 7 dbms_aq.namespace_anonymous, 8 utl_raw.cast_to_raw( 'my message' ) ) ), 1 ); 9 10 end; 11 / PL/SQL procedure successfully completed. SQL> SQL> SQL> exec dbms_lock.sleep(10); PL/SQL procedure successfully completed. SQL> SQL> select * from my_queue_debug; MSG ----------------------------------------------------------- this is a test payload
It is important to do not query the table immediately after the message. The callback mechanism needs a bit of time.
Kind regards
WoG
Tags: Database
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