RE: AQ dequeue question
- From: Marius Raicu <mariu200@xxxxxxxxx>
- To: bpolarsk@xxxxxxxxx, rjamya@xxxxxxxxx, oracle-l@xxxxxxxxxxxxx
- Date: Fri, 26 May 2006 14:18:23 +0200 (CEST)
Hi,
What about using SORT_LIST and/or MESSAGE_GROUPING parameters of
dbms_aqadm.create_queue_table? Otherwise, defining a user message type where
you declare a column like PRIORITY/SEQUENCE and getting max from this column
after dequeuing or using correlation_id with message enqueuing may be an area
to explore.
regards,
Bernard Polarski <bpolarsk@xxxxxxxxx> a écrit : Do you mean you want the apply
process to skip rows in the queue table and jump directly to the last occurence
of this row? You can alway write your own dml handler but rows are compared
with the full value of every columns, that's why you activated the suplemental
logs. I doubt you will earn something with your dml handler. The heaviest part
in streams are the update and you want to detect them each.
As of attibute that could palys in ordered for a single column you could use
the SCN of t he user_data with something like that :
declare
lcr sys.LCR$._ROW_RECORD
rc PLS_INTEGER;
object_scb number;
trn_id varchar2 ;
begin
for p_x in (select user_data from AQ$_<QUEUE_RECEIVER>
loop
rc:= p_x.user_data.getobject(lcr) # load the user_data into LCR
-- use scn
object_scn := lcr.get_scn();
-- or use the trancaction id is a varchar - which is the sequentiel id
of the user_data
trn_id=lcr_get_trancation_id();
-- now you check if there is already another another one and decide to
delete this user_data or
execute it. with lcr.execute;
end loop;
end;
all this will take you far in time development
B.Polarski
http://www.smenu.org
-----Original Message-----
From: rjamya [mailto:rjamya@xxxxxxxxx]
Sent: Thursday, 25 May, 2006 9:32 PM
To: Oracle Discussion List
Subject: AQ dequeue question
We have a process that tracks changes to a table, whenever a column is
changes, pk is inserted in a AQ. There is a daemon process that does
some processing based on this value.
It may happen that in a short burst, one row may get modified multiple
times. Now we want to avoid re-processing the same row based on
entries in AQ.
Is there a way to get a ordered (rather distinct) set for dequeue by
specifying an attribute in the USERDATA part of the payload when
dequeuing?
Oracle is 9.2
Regards,
Marius
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