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| MQ8 z/OS ghost messages on structure high |
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| GheorgheDragos |
 Posted: Fri Sep 27, 2019 3:31 am Post subject: MQ8 z/OS ghost messages on structure high |
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Acolyte
Joined: 28 Jun 2018
Posts: 51
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Dear MQ fellows,
We have a strange situation. Currently one of our production structures is at 83% Stor utilisation and 34.1% Entries used. When I do the following :
dis ql(*) where(cur depth gt 500) cfstruct(........02) maxmsgl
I do not see anything unusual! 2000,3000 messages... from where is this utilisation coming ? The display of the structure shows
STORAGE CONFIGURATION ALLOCATED MAXIMUM %
ACTUAL SIZE: 7889 M 7889 M 100
SPACE USAGE IN-USE TOTAL %
ENTRIES: 1292633 3796810 34
ELEMENTS: [b]18999633[/b] 22778843 83
EMCS: 8299 3026688 0
LOCKS: 1024
Where are those messages ?
EDIT
87% full. Close to a MQ breakdown and I still don't know where the usage is. I am thinking, maybe some batch job is putting uncommitted messages there ??? |
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| fjb_saper |
| Posted: Sat Sep 28, 2019 5:57 pm Post subject: Re: MQ8 z/OS ghost messages on structure high |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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| GheorgheDragos wrote: |
Dear MQ fellows,
We have a strange situation. Currently one of our production structures is at 83% Stor utilisation and 34.1% Entries used. When I do the following :
dis ql(*) where(cur depth gt 500) cfstruct(........02) maxmsgl
I do not see anything unusual! 2000,3000 messages... from where is this utilisation coming ? The display of the structure shows
STORAGE CONFIGURATION ALLOCATED MAXIMUM %
ACTUAL SIZE: 7889 M 7889 M 100
SPACE USAGE IN-USE TOTAL %
ENTRIES: 1292633 3796810 34
ELEMENTS: 18999633 22778843 83
EMCS: 8299 3026688 0
LOCKS: 1024
Where are those messages ?
EDIT
87% full. Close to a MQ breakdown and I still don't know where the usage is. I am thinking, maybe some batch job is putting uncommitted messages there ??? |
Typically "ghost" messages are messages that were put under syncpoint, for which the application has exited / crashed without doing a commit or a rollback. If there is no provision for pending UOW's on application restart you might have to do a manual force commit or rollback. 
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| GheorgheDragos |
| Posted: Sat Sep 28, 2019 8:45 pm Post subject: |
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Acolyte
Joined: 28 Jun 2018
Posts: 51
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| We are in our 3rd day under P1 with IBM. Structure size double, no idea why this happened, it reach 100% once and hell broke loose. |
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| GheorgheDragos |
| Posted: Mon Sep 30, 2019 10:21 am Post subject: |
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Acolyte
Joined: 28 Jun 2018
Posts: 51
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For this forums reference, the situation was that mq labs analyzed the dump and we found a transaction in cics, apparently on a get loop, which I don’t know how is possible - a put loop I can understand, it a get loop filling up the structure list ??? , that survived the initial crash of the structure and kept on running for 24 hours, and we managed(IBM heads) to discover, cancel (well the whole region ) at 98% structure.
Hope it helps. |
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