Newbie trying to understand usage of DBMS_ALERT in application

Regarding DBMS_ALERT, under "Operational Notes" here
http://docs.oracle.com/cd/E11882_01/appdev.112/e25788/d_alert.htm
I see the following text:
Alerts can be signalled more often than the corresponding application wait calls. In such cases, the
older alerts are discarded. The application always gets the latest alert (based on transaction commit times).
It is possible to receive an alert, read the data, and find that no data has changed. This is because
the data changed after the prior alert, but before the data was read for that prior alert.Scenario A: The waiting application receives a first alert, then processes this alert, and during this processing, a second alert might have been sent, but the application (while processing the previous alert), is not currently waiting, and so misses this second alert. After processing completes, the application goes back to waiting, when a possible third alert comes along. In this way, the application may not "see" all possible alerts.
Scenario B: The waiting application receives a first alert, then process this alert. Between the time the application received the alert and processes it, a second alert may have taken place, in which case the application only "reads" the second alert. In this way the application may not "see" all possible alerts.
Are those both possible scenarios with DBMS_ALERT? Did I miss any other cases where the application would miss an alert?
If so, then DBMS_ALERT seems suited for applications that only need current data. For example, it wouldn't be suited to distributing 911 calls to emergency personnel because, while the latest call will always get through, there's the potential that one may not get seen by the application. Pardon the bad example, but is that essentially the usage model for DBMS_ALERT?
Edited by: tem on Apr 18, 2012 5:42 PM

>
If the alert indicates some event took place, and the application receives this alert, the application must leave the waiting mode to process this alert. If that is correct, then the application carries out any needed processing, then returns to waiting.
During processing, between the time the application retrieves the last bit of data from the database, and the time the application returns to waiting
Also, the event that triggered this second alert would not be represented during the time the application processed the last alert (since it hadn't occurred yet). It would seem the application would need to receive another (third) alert after it begins waiting again before becoming aware of this second event. Hopefully I'm not repeating myself, and thanks for your patience.
>
Well, yes, you are repeating yourself and that means I must repeat myself.
Reread my last response - it all depends on the way you architect the system.
Your approach seems to be have one procedure, 'WAIT_ON_AND_PROCESS_ALERT', that waits for an alert and then processes that alert no matter how longer it takes (seconds, hours, weeks) and then waits on the next alert. You could certainly implement it synchronously that way but that isn't the way you would implement it.
Again - back to the 911 call example. An alert trigger is created on the CALL_TABLE that sends an alert every time an INSERT on the table is committed. The details of the 911 call are in the table record.
You create a stored procedure, PROCESS_UNASSIGNED_CALLS, that processes new records (status = UNASSIGNED) in the CALL_TABLE. It processes all records with an UNASSIGNED status. It doesn't care or even know if there are alerts going on. When the procedure executes it processes the records and dispatches them to be acted on.
Now you create an ON DEMAND job using DBMS_JOB or SCHEDULER that executes the PROCESS_UNASSIGNED_CALLS procedure.
Now you create a 'WAIT_ON_AND_PROCESS_ALERT' procedure that loops and uses the DBMS_ALERT.WAITONE Procedure to wait for the proper alert. When an alert occurs it executes the DBMS_JOB and then goes back to waiting for the next alert. There is no delay except for the fraction of a second it takes to launch the job.
The DBMS_JOB then calls the PROCESS_UNASSIGNED_CALLS procedure which processes ALL new records. The records could have triggered one or 100 alerts; the procedure doesn't care.
Nothing is missed because the PROCESS_UNASSIGNED_CALLS procedure doesn't exit until there are no more records to process.

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