<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<TITLE>Event Queues - Comments on Pros & Cons?</TITLE>
<META content="MSHTML 5.50.4522.1800" name=GENERATOR></HEAD>
<BODY>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=590302307-20092001>Hi
Andrew,</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=590302307-20092001></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=590302307-20092001>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).</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=590302307-20092001>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.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=590302307-20092001></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=590302307-20092001>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.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=590302307-20092001></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=590302307-20092001>best
regards,</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=590302307-20092001>Stefan</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=590302307-20092001></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=590302307-20092001></SPAN></FONT> </DIV>
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> Rankin, Andrew AJ
[mailto:Andrew.J.Rankin@BHPBilliton.com]<BR><B>Sent:</B> Donnerstag, 20.
September 2001 04:45<BR><B>To:</B> SAP-WUG@MITVMA.MIT.EDU<BR><B>Subject:</B>
Event Queues - Comments on Pros & Cons?<BR><BR></FONT></DIV>
<P><FONT face=Arial size=2>Hi all,</FONT> </P>
<P><FONT face=Arial size=2>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.</FONT></P>
<P><FONT face=Arial size=2>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?</FONT></P>
<P><FONT face=Arial size=2>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?</FONT></P>
<P><FONT face=Arial size=2>I thank you for any expert advice.</FONT> </P>
<P><FONT face=Arial size=2>Andrew Rankin.</FONT> </P><BR>
<P><FONT face=Arial size=2>EOM </FONT></P>
<P><FONT face=Arial size=2>NOTICE - This message and any attached files may
contain information that is confidential and/or subject of legal privilege
intended only for use by the intended recipient. If you are not the intended
recipient or the person responsible for delivering the message to the intended
recipient, be advised that you have received this message in error and that any
dissemination, copying or use of this message or attachment is strictly
forbidden, as is the disclosure of the information therein. If you have
received this message in error please notify the sender immediately and delete
the message.</FONT></P></BODY></HTML>