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MQSeries.net Forum IndexGeneral IBM MQ SupportMQ8 z/OS ghost messages on structure high

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GheorgheDragos
PostPosted: Fri Sep 27, 2019 3:31 am Post subject: MQ8 z/OS ghost messages on structure high Reply with quote

Novice

Joined: 28 Jun 2018
Posts: 18

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
PostPosted: Sat Sep 28, 2019 5:57 pm Post subject: Re: MQ8 z/OS ghost messages on structure high Reply with quote

Grand High Poobah

Joined: 18 Nov 2003
Posts: 20124
Location: LI,NY

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
PostPosted: Sat Sep 28, 2019 8:45 pm Post subject: Reply with quote

Novice

Joined: 28 Jun 2018
Posts: 18

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
PostPosted: Mon Sep 30, 2019 10:21 am Post subject: Reply with quote

Novice

Joined: 28 Jun 2018
Posts: 18

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 dont 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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