RE: AQ dequeue question

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_at_gmail.com]
 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

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