Problem determination in DQM
Aspects of problem determination relating to distributed queue management (DQM) and suggested methods of resolving problems.
Some of the problems that are described are platform and installation specific. Where this is the case, it is made clear in the text.
IBM MQ provides a utility to assist with problem determination named amqldmpa. During the course of problem determination, your IBM service representative might ask you to provide output from the utility.
Your IBM service representative will provide you with the parameters you require to collect the appropriate diagnostic information, and information on how you send the data you record to IBM. Attention: We should not rely on the format of the output from this utility, as the format is subject to change without notice.- Error message from channel control
- Ping
- Dead-letter queue considerations
- Validation checks
- In-doubt relationship
- Channel startup negotiation errors
- Shared channel recovery
- When a channel refuses to run
If a channel refuses to run, there are a number of potential reasons. - Retrying the link
- Data structures
Data structures are needed for reference when checking logs and trace entries during problem diagnosis. - User exit problems
The interaction between the channel programs and the user-exit programs has some error-checking routines, but this facility can only work successfully when the user exits obey certain rules. - Disaster recovery
- Channel switching
- Connection switching
- Client problems
- Error logs
- Message monitoring
Parent topic: IBM MQ Troubleshooting and support
Related concepts
Related tasks
- IBM MQ Troubleshooting and support
- Making initial checks on UNIX, Linux, and Windows
- Making initial checks on z/OS
- Making initial checks on IBM i
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