15=End

Use End to stop channel activity

Use the End option to request the channel to stop activity. The channel does not send any more messages.

Select F4 before pressing enter to choose whether the channel becomes STOPPED or INACTIVE, and whether to stop the channel using a CONTROLLED or an IMMEDIATE stop. A stopped channel must be restarted by the operator to become active again. An inactive channel can be triggered.


Stop immediate

Use Stop immediate to stop a channel without completing any unit of work.

This option terminates the channel process. As a result the channel does not complete processing the current batch of messages, and cannot, therefore, leave the channel in doubt. In general, it is better for the operators to use the controlled stop option.


Stop controlled

Use Stop controlled to stop a channel at the end of the current unit of work.

This choice requests the channel to close down in an orderly way; the current batch of messages is completed, and the sync point procedure is carried out with the other end of the channel.


Restarting stopped channels

When a channel goes into STOPPED state, you must restart the channel manually. We can restart the channel in the following ways:

  • By using the START CHANNEL MQSC command.
  • By using the Start Channel PCF command.
  • By using the IBM MQ Explorer.
  • On z/OS®, by using the Start a channel panel.
  • On IBM i, by using the STRMQMCHL CL command or the START option on the WRKMQMCHL panel.

For sender or server channels, when the channel entered the STOPPED state, the associated transmission queue was set to GET(DISABLED) and triggering was set off. When the start request is received, these attributes are reset automatically.

If the channel initiator stops while a channel is in RETRYING or STOPPED status, the channel status is remembered when the channel initiator is restarted. However, the channel status for the SVRCONN channel type is reset if the channel initiator stops while the channel is in STOPPED status.

If the queue manager stops while a channel is in RETRYING or STOPPED status, the channel status is remembered when the queue manager is restarted. From IBM MQ Version 8.0 onwards, this applies to SVRCONN channels as well. Previously, the channel status for the SVRCONN channel type was reset if the channel initiator stopped while the channel was in STOPPED status.