Defining IMS Resources

Enterprise Server IMS support includes two transactions, /CIC and /IMS, that you use to switch enterprise servers to CICS and IMS modes respectively. For these transactions to be available, you need to update your resource definition file at an command prompt using the caspcupg command as follows:

caspcupg /dp=resourcedefinitionpath /o

where resourcedefinitionpath is the path to the system resource definition file to be updated. If you are using the default system resource defintion file, dfhdrdat located by default in , you can omit /dp=resourcedefinitionpath. See caspcupg for more information on the caspcupg command.

Updating a resource definition file with the /CIC and /IMS transactions in this way is a one-off process, meaning that once you have used caspcupg to upgrade a resource definition file, any enterprise server that uses the updated resource definition file can use the new transactions.

Resource Group

Before you can run an IMS application in an enterprise server you ensure that the following resources are included in a resource group:

Transactions: You must add a list of all transactions and their associated programs to a resource group. This is done by adding a PCT.
Messages: Add the message processing regions that the enterprise server uses.
Message Processing Region (MPR): To run an IMS application in an enterprise server you need at least one specialized service execution process (SEP) called a message processing region (MPR). To specify that a message processing region starts each time an enterprise server starts, it must be included in a resource group that is specified by the startup list in the SIT used by the enterprise server.

You can add these resources to an existing resource group or create a new one for them.

Startup Lists

Having created a resource group for the resources needed by your IMS application, you need to add the resource group to a startup list.

Note: To update a resource group or startup list, you must first start the enterprise server then use Enterprise Server Monitor and Control (ESMAC). See Administering Enterprise Server Instances using ESMAC for more information on using ESMAC.