Multiple installations of IBM MQ

You can choose to have one of the IBM® MQ installations configured as the primary installation. Your choice depends on how applications locate libraries.

The IBM MQ libraries, such as mqm, which ship with the product automatically use libraries of the level required by the queue manager to which they are connecting. This means that provided an application locates its IBM MQ libraries from an IBM MQ installation, it can connect to any queue manager on that system. Having one installation configured as primary ensures that if the application finds its IBM MQ interface library, the application can connect to any queue manager.

For more information about connecting applications in a multiple installation environment, see Connecting applications in a multiple installation environment.

The primary installation is not automatically changed when you uninstall the primary installation. If you want another installation to be the primary installation, you must manually set the primary installation using the setmqinst command. For more information, see Uninstalling, upgrading, and maintaining the primary installation.