Problem determination in DQM
Aspects of problem determination relating to distributed queue management (DQM) and suggested methods of resolving problems.
This topic explains the various aspects of problem determination and suggests methods of resolving problems. Some of the problems mentioned in this topic are platform and installation specific. Where this is the case, it is made clear in the text.
IBM® WebSphere® 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: You should not rely on the
format of the output from this utility, as the format is subject to change without notice.
Problem determination for the following scenarios is discussed:
- Error message from channel control
- Ping
- Dead-letter queue considerations
- Validation checks
- In-doubt relationship
- Channel startup negotiation errors
- When a channel refuses to run
- Retrying the link
- Data structures
- User exit problems
- Disaster recovery
- Channel switching
- Connection switching
- Client problems
- Error logs
- Message monitoring