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 --------------------------------- Yahoo! Mail réinvente le mail ! Découvrez le nouveau Yahoo! Mail et son interface révolutionnaire.