Getting started

This section describes getting started with intra-group queuing.

Enabling intra-group queuing

To enable intra-group queuing on your queue managers, you need to do the following :

• Define a shared transmission queue called SYSTEM.QSG.TRANSMIT.QUEUE. The definition of this queue can be found in thlqual.SCSQPROCS(CSQ4INSS), the CSQINP2 sample for SYSTEM objects for queue-sharing groups. This queue must be defined with the correct attributes, as stated in thlqual.SCSQPROCS(CSQ4INSS), for intra-group queuing to work properly.
• Because the IGQ agent is always started at queue manager initialization, intra-group queuing is always available for inbound message processing, that is, the IGQ agent processes any messages that are placed on the SYSTEM.QSG.TRANSMIT.QUEUE. However, to enable intra-group queuing for outbound processing, the queue manager attribute IGQ must be set to ENABLED.

Disabling intra-group queuing

To disable intra-group queuing for outbound message transfer, set the queue manager attribute IGQ to DISABLED. Note that if intra-group queuing is disabled for a given queue manager, the IGQ agent on that queue manager can still process inbound messages that have been placed on the SYSTEM.QSG.TRANSMIT.QUEUE by a queue manager that does have intra-group queuing enabled for outbound transfer.

Using intra-group queuing

Once intra-group queuing is enabled, it is available for use and a queue manager uses it whenever possible. That is, when an application puts a message to a remote queue definition, to a fully qualified remote queue, or to a cluster queue, the queue manager determines if the message is eligible to be delivered using intra-group queuing and if it is, places the message on to SYSTEM.QSG.TRANSMIT.QUEUE. There is no need to make changes to user applications, or to application queues, because for eligible messages the queue manager makes use of the SYSTEM.QSG.TRANSMIT.QUEUE, in preference to any other transmission queue.