RE: Data queue space

["McCallion, Martin" <MccalliM@xxxxxxxxxxxxxxxx>]

> > Just to change the subject a little, has anyone tried using message
> > queues instead of data queues?  I've never used the product, but
isn't
> > the MQ product line based upon data exchange through Message Queues?
>
> There are different considerations using msgs, such as the need to
remove them yourself once they have been processed, performance 
> overhead (data queues are much faster), etc., but it's certainly a
viable alternative.

MQSeries doesn't use AS/400 message queues, it has its own internal
"objects" called queues and channels (and some others).  Prior to
release 5.1, these were implemented by user spaces and user indexes.  As
of 5.1 files in the IFS are used (the change is because they've switched
to a common code base (and version numbering convention) with the other
platforms).

You don't have the data queue problems of continuous growth of queue
size  Prior to 5.1 there is some overhead of journal receiver
management, but it's mainly a matter of backing them up and deleting the
ones that aren't required online.  5.1 appears not to use journalling.

Cheers,

Martin.


--                                                                     
Martin McCallion                 
Midas-Kapiti International
Work:  mccallim@midas-kapiti.com
Home: martin.mccallion@ukonline.co.uk

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