The DQM channel control function

The channel control function provides the interface and function for administration and control of message channels between WebSphere MQ for iSeries and compatible systems. See Figure 28 for a conceptual picture.

The channel control function consists of WebSphere MQ for iSeries panels, commands, programs, a sequence number file, and a file for the channel definitions. The following is a brief description of the components of the channel control function:

• The channel definition file (CDF):
  • Is indexed on channel name
  • Holds channel definitions
• The channel commands are a subset of the WebSphere MQ for iSeries set of commands.

  Use the command GO CMDMQM to display the full set of WebSphere MQ for iSeries commands.

• You use channel definition panels, or commands to:
  • Create, copy, display, change, and delete channel definitions
  • Start and stop channels, ping, reset channel sequence numbers, and resolve in-doubt messages when links cannot be re-established
  • Display status information about channels
• Sequence numbers and logical unit of work (LUW) identifiers are stored in the synchronization file, and are used for channel synchronization purposes.