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thindk00 · Posted: Mon Jun 06, 2005 6:58 am Post subject:

Hi,

I've just seen the below in the notes for CSD6:

******************************
This WebSphere MQ V5.3 update introduces a new queue attribute
NPMCLASS which applies to local and model queues. NPMCLASS can
take one of two values:

1.NPMCLASS(NORMAL) - This is the default value and indicates
that non-persistent messages on this queue are only lost following
a failure, or a queue manager shutdown. These messages will be
discarded in the event of a queue manager restart.

2.NPMCLASS(HIGH) - This setting enables non-persistent messages on
this queue to be retained across a queue manager restart.
Non-persistent messages may still be lost in the event of a
failure.
******************************

Is anyone using this? Are there any issues? I'm interested in getting the performance of non-persistent messages and getting back some of the reliability/availability of persistent messages. Is this a viable option? Does anyone have any information on the amount of WMQ logging activity that is performed for the following modes:

1) Non-persistent messages
2) Non-persistent messages on a NPMCLASS(HIGH) queue
3) Persistent messages

Thanks in advance,

Kulbir.