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Status Not under consideration
Workspace MQ, MQ Advanced & MQ Appliance
Created by Guest
Created on Dec 14, 2023

RELATED IDEAS

Add command or automation to reduce CURFSIZE immediately

Use case:

RDQM with limited space. One Xmit queue used all space as partner queue manager had issue. Once issue was solved, draining Xmit queue is slow.

It would be beneficial to release q file space immediately once messages were consumed, say after 20% reduction, even queue is still in use by channel.

According manual there are only 3 possibilities when space is released:

https://www.ibm.com/docs/en/ibm-mq/9.3?topic=mmqf-calculating-how-much-data-mq-queue-file-can-store

Note: When a queue has messages removed from it, the CURFSIZE attribute might not decrease immediately.

Typically, unused space in a queue file is only released in the following circumstances:

-When no applications have the queue open

-After 1000 writes to the queue manager log, or

-At queue manager shutdown

Please add a 4th possibility:

Implement a command to enforce release of unused space.

or

Implement an automation which reduces space automatically once 20% is unused.

Idea priority High
  • Admin
    Mark Taylor
    Reply
    |     Feb 20, 2024

    A queue manager already looks for opportunities to decrease queue file sizes on disk during checkpoints as highlighted by the submitter, by default a checkpoint occurs every 30 minutes or every 50K checkpointable operations (puts/gets/commits/etc) but that can be tuned up or down.

    There would be limited value to provide a further command to request this, which could be always denied if the queue is still open and in use by applications or channels.

    Capacity planning for a queue manager should ensure that enough disk space is provided to cater for queues filling and so it would not be recommended to provide under-provisioned storage for a queue manager. Queues (and the disk footprint) are intended to grow to meet demand and MQ is designed to expect that resources needed to handle such spikes are likely to be needed again.

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