Snap dumps on z/OS

Snap dump data sets are controlled by z/OS® JCL command statements. Use this topic to understand the CSQSNAP DD statement.

Snap dumps are always sent to the data set defined by the CSQSNAP DD statement. They can be issued by the adapters or the channel initiator.

• Snap dumps are issued by the batch, CICS®, IMS, or RRS adapter when an unexpected error is returned by the queue manager for an MQI call. A full dump is produced containing information about the program that caused the problem.

  For a snap dump to be produced, the CSQSNAP DD statement must be in the batch application JCL, CICS JCL, or IMS dependent region JCL.

• Snap dumps are issued by the channel initiator in specific error conditions instead of a system dump. The dump contains information relating to the error. Message CSQX053E is also issued at the same time.

  To produce a snap dump, the CSQSNAP DD statement must be in the channel initiator started-task procedure.