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Dear Maisa Mendes,
Thank you for submitting this IMS enhancement request.
After a comprehensive review, we regret to inform you that we have determined that at this time this request will not be a candidate for inclusion in an upcoming release because it is not consistent with the product architecture. Hence, we have rejected this request.
IMS does not track the queue manager buffer usage by transaction or dependent region, so it does not have the information to be able to issue such a message. Additionally, in this case, knowing this information would not necessarily have helped, except possibly diagnostically. The issue was a GU of a very large message from CQS. A single GU is issued by the application, but this causes QMGR to read all of the message records from CQS before returning to the application. Since the application is in a DLI call during this processing, even if the transaction consuming the buffers could be known, no action (such as /STO REG or /STO REG ABDUMP) would be able to terminate the region until the call completed.
Instead, we think a better approach is to investigate improving the queue manager large message processing to not require the entire message to be read into IMS control region storage on the first GU. This would avoid the buffer shortage, because only the first record and the current record would need to be in storage at any given time. This change is not straightforward, and requires additional research to determine its feasibility; however, we think it is better to solve the buffer shortage issue than to issue a message about it.
We appreciate your input to the IMS development team.
Sincerely,
Honghao Zhang