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Status Future consideration
Workspace IMS Transaction Manager
Categories Message Queue Management
Created by Guest
Created on Mar 3, 2022

RELATED IDEAS

Enhance Capability of DFSNDMX0 Exit

1) Pass information to exit to indicate if a deadlock abend was due to an ESS deadlock.

Business value: DB2 handles lock timeouts on object locks, such as tablespace locks, as deadlocks
These are persistent conditions, a retry of the transaction is not likely to be successful.
Retrying creates a very long response time for the message involved and also ties up
dependent region for prolonged periods, impacting other work.
DFSNDXM0 can be used to discard such messages rather than retrying them

2) Pass information to the exit to indicate if the message involved is a retry.

Business value: To discriminate between deadlock conditions likely to be resolved on
retry and those likely to fail again, it is useful to know if the failing message has already been retried

3) Provide capability to discard an IFP message
Business value - for the reasons described above, it may be desirably to prevent repeated retries
of transaction messages. Current implementation does not allow this for IFP messages


4) Invoke the exit when there is a no message condition. An example a /STO REG ABDUMP command
targeting a PWFI MPP. The transaction instance waiting on GU abends U0474, and DFSNDMX0 cannot
be used to restart it. This complicates customer automation.

Idea priority High
  • Guest
    Reply
    |     May 31, 2023
    Thank you for your interest in keeping IMS a vital and successful product. When choosing new features to add from the list of requirements in our backlog, we assess which will bring the most value to as many clients as possible and prioritize those.

    Upon further review this request for enhancement, we have decided to reject item #3 (Provide capability to discard an IFP message) because of technical feasibility on how IFP message queue is managing the retry process. The requested change may incur additional overhead for processing.

    For item #1, 2 and 4, we would add them to the backlog for future review and considerations.

    Thank you for your continued support with IMS. If you have any further question, please contact us.

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