Event Queues - Comments on Pros & Cons?

[Baeuerle, Stefan]

Hi Andrew,
 
if you just want to use the event queue to handle the errors in your event
receivers, you don't have to activate the queue. You just have to set the
error behaviour to a state other than "deactivate the linkage". This can be
done in the event-queue-administration for all linkages that use the default
or for each linkage in detail (settings of the event-linkage).
If the behaviour on errors is set to "mark linkage as having errors" or "do
not change linkage", than events for a given receiver are returned into the
queue if an error occurs (wheather the queue is active or not). You can
restart these receivers from the event-queue-administration.
 
If you use start conditions that force the receiver not to be started, this
receiver will never be inserted into the event queue. The queue just handles
the receivers that should be started for a given event.
 
best regards,
Stefan
 
 
-----Original Message-----
From: Rankin, Andrew AJ [mailto:Andrew.J.Rankin at BHPBilliton.com]
Sent: Donnerstag, 20. September 2001 04:45
To: SAP-WUG at MITVMA.MIT.EDU
Subject: Event Queues - Comments on Pros & Cons?
 
 
 
Hi all,
 
>From what I have read, event queues are available to assist with performance
where there is a likelihood of a large number of the same event being
created in a very short space of time. To date, I haven't used them and
haven't had problems, and I don't expect that to change. However the other
thing that also interests me is that you can use the event queue to manage
the case where event linkages end in an error, so that with the correct
settings in the event linkage, if necessary these events can be resubmitted
once the problem is fixed.
 
We had the situation a while ago where a small number of event linkage
instances went into error because a table space was filled. Fortunately it
was picked up early, and I only had to recreate a small number of these
events by hand. If the number was large, I don't know how I would manage to
kick off all the worklfows required without spending many tedious hours
doing it manually. Perhaps this was a freak occurrence, but it makes me
think that I should switch on the event queue for everything, to cover this
risk in the future. So what is the downside to using the event queue, if
any?
 
The other thing I'm wondering though is if I do switch it on, will it see
event linkages that end with exception due to a start condition killing it
(which we want to happen)? What else do I need to consider?
 
I thank you for any expert advice.
 
Andrew Rankin.
 
 
EOM
 
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