The XA switch structures

Two XA switch structures are supplied with the extended transactional client on each platform.

These switch structures are:

MQRMIXASwitch: This switch structure is used by a transaction manager when a queue manager, acting as a resource manager, is not using dynamic registration.
MQRMIXASwitchDynamic: This switch structure is used by a transaction manager when a queue manager, acting as a resource manager, uses dynamic registration.

These switch structures are located in the libraries shown in Table 1.


Platform	Library containing the XA switch structures
AIX Linux	MQ_INSTALLATION_PATH/lib/libmqcxa
Windows systems	MQ_INSTALLATION_PATH\bin\mqcxa.dll ¹

MQ_INSTALLATION_PATH represents the high-level directory in which IBM MQ is installed.

The name of the IBM MQ resource manager in each switch structure is MQSeries_XA_RMI, but many queue managers can share the same switch structure.

Dynamic registration and extended transactional processing
Using dynamic registration is a form of optimization because it can reduce the number of xa_ function calls issued by the transaction manager.

Parent topic: Configure XA-compliant transaction managers