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| pcouas |
 Posted: Thu Sep 12, 2019 8:22 pm Post subject: |
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Voyager
Joined: 06 Sep 2011
Posts: 79
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Hi
" why not simply you amqsget / RFHUtil / A.N.Other utility to destructively read all the messages off? Why so desparate to use CLEAR QUEUE?"
This "amqsget / RFHUtil " could be coded in Java with PCF Commands ?
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| Vitor |
| Posted: Fri Sep 13, 2019 4:09 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| pcouas wrote: |
| This "amqsget / RFHUtil " could be coded in Java with PCF Commands ? |
These utilities would simply read the queue until it's empty.
So if you want to write a piece of Java that reads the queue until it's empty, go for it.
The point that I and others are making is that this is a commonly used way of clearing a queue with an open handle on it and there are utilities available to assist if you choose to use them. If you instead choose to roll your own, go for it.
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Honesty is the best policy.
Insanity is the best defence. |
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| Andyh |
| Posted: Sun Sep 15, 2019 10:06 pm Post subject: |
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Master
Joined: 29 Jul 2010
Posts: 239
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It wasn't 100% clear to me from the initial post whether the amqrmppa was acting on behalf of a message channel, or a client channel.
Assuming the former, a receiver channel will keep a cache of queue handles open to avoid the overheads associated with opening the queue each time a message is sent down the channel.
If the handle hasn't been used recently then it should be pruned automatically, while if messages are still arriving over the channel you'd need to stop the channel to close the handle.
Using a repeating MQGET doesn't carry the same guarantees as CLEAR QL, for example a message which is locked to a UOW or a browse cursor would be invisible to an MQGET. |
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| gbaddeley |
| Posted: Mon Sep 16, 2019 4:34 pm Post subject: |
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Jedi Knight
Joined: 25 Mar 2003
Posts: 2538
Location: Melbourne, Australia
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As an aside, app messaging designs using MQ should not have any requirement to "clear queues" or "drain queues". There should be a well-behaved consumer app, or otherwise the messages should not be produced in the first place.
We have hundreds of MQ messaging interfaces using many different producer and consumer app technologies (including Java MQ classes, JMS, IIB, .Net), and we never need to clear any queues under normal operations.
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Glenn |
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| sderiis |
| Posted: Wed Oct 02, 2019 1:24 pm Post subject: |
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Newbie
Joined: 02 Oct 2019
Posts: 3
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Ok
But This channel could block CLEAR QUEUE operation and giving an 4004 Error ? |
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| bruce2359 |
| Posted: Wed Oct 02, 2019 2:22 pm Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9486
Location: US: west coast, almost. Otherwise, enroute.
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... and in any case, when I'm asked to clear any prod queue, I get a signed waiver from mgt. relieving me of any downstream responsibility for loss of data.
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| HubertKleinmanns |
| Posted: Mon Oct 07, 2019 12:03 am Post subject: |
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Shaman
Joined: 24 Feb 2004
Posts: 732
Location: Germany
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| sderiis wrote: |
Ok
But This channel could block CLEAR QUEUE operation and giving an 4004 Error ? |
Any application, which has a handle on a queue, blocks CLEAR QLOCAL.
This could be
- a channel
- the DLQ handler
- other application
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Regards
Hubert |
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| PaulClarke |
| Posted: Mon Oct 07, 2019 10:44 am Post subject: |
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Grand Master
Joined: 17 Nov 2005
Posts: 1002
Location: New Zealand
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If you are trying to use MO71 to clear a queue and you can't because someone has the queue open then you can use the good old fashioned way of getting every message off the queue. In the message browse window just right click and then select 'Apply to all messages'. Your Delete button will change to 'Delete All'. Pressing that will now delete all messages from the queue.
Cheers,
Paul.
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Paul Clarke
MQGem Software
www.mqgem.com |
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