Get started with objects

Get started with objects

Channels must be defined, and their associated objects must exist and be available for use, before a channel can be started. This section shows you how.
Use the IBM MQ commands (MQSC) or the IBM MQ Explorer to:

Define message channels and associated objects
Monitor and control message channels
The associated objects you might need to define are:

Transmission queues
Remote queue definitions
Queue manager alias definitions
Reply-to queue alias definitions
Reply-to local queues
Processes for triggering (MCAs)
Message channel definitions

The particular communication link for each channel must be defined and available before a channel can be run. For a description of how LU 6.2, TCP/IP, NetBIOS, SPX, and DECnet links are defined, see the particular communication guide for your installation. See also Example configuration information.

For more information about creating and working with objects, see the following subtopics:

Creating associated objects
MQSC is used to create associated objects.
Creating default objects
Default objects are created automatically when a queue manager is created. These objects are queues, channels, a process definition, and administration queues. After the default objects have been created, we can replace them at any time by running the strmqm command with the -c option.
Creating a channel
Create two channel definitions, one at each end of the connection. We create the first channel definition at the first queue manager. Then you create the second channel definition at the second queue manager, on the other end of the link.
Displaying a channel
Use the MQSC command DISPLAY CHANNEL to display the attributes of a channel.
Displaying channel status
Use the MQSC command DISPLAY CHSTATUS, specifying the channel name and whether you want the current status of channels or the status of saved information.
Checking links using Ping
Use the MQSC command PING CHANNEL to exchange a fixed data message with the remote end.
Starting a channel
Use the MQSC command START CHANNEL for sender, server, and requester channels. For applications to be able to exchange messages, you must start a listener program for inbound connections.
Stop a channel
Use the MQSC command STOP CHANNEL to request the channel to stop activity. The channel does not start a new batch of messages until the operator starts the channel again.
Renaming a channel
Use MQSC to rename a message channel.
Resetting a channel
Use the MQSC command RESET CHANNEL to change the message sequence number.
Resolving in-doubt messages on a channel
Use the MQSC command RESOLVE CHANNEL when messages are held in-doubt by a sender or server. For example because one end of the link has terminated, and there is no prospect of it recovering.
Parent topic: Monitor and controlling channels on UNIX, Linux, and Windows