HeartbeatInterval (MQLONG)

This field specifies the time in seconds between heartbeat flows.

The interpretation of this field depends on the channel type, as follows:

For a channel type of MQCHT_SENDER, MQCHT_SERVER, MQCHT_RECEIVER MQCHT_REQUESTER, MQCHT_CLUSSDR, or MQCHT_CLUSRCVR, this field is the time in seconds between heartbeat flows passed from the sending MCA when there are no messages on the transmission queue. This gives the receiving MCA the opportunity to quiesce the channel. To be useful, HeartbeatInterval must be less than DiscInterval.
For a channel type of MQCHT_CLNTCONN or MQCHT_SVRCONN with the MQCD Sharing Conversations field set to zero, this field is the time in seconds between heartbeat flows passed from the server MCA when that MCA has issued an MQGET call with the MQGMO_WAIT option on behalf of a client application. This allows the server MCA to handle situations where the client connection fails during an MQGET with MQGMO_WAIT.
For a channel type of MQCHT_CLNTCONN or MQCHT_SVRCONN with the MQCD Sharing Conversations field set to a non-zero value, this field is the time in seconds between heartbeat flow when there are no data flows sent or received. This allows the channel to be quiesced efficiently.

The value is in the range 0 through 999 999. The value that is used is the larger of the values specified at the sending side and receiving side unless a value of 0 is specified at either side, in which case no heartbeat exchange occurs.

This is an input field to the exit. The field is not present if Version is less than MQCD_VERSION_4.