CDC Guide for z/OS

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Providing Access to the External Subsystem Modules

The IMS synchronous ECCR requires access to the IMS external subsystem modules in the IMS dependent regions.

The DFSESL DD statement specifies the library that contains the external subsystem modules. At minimum, the DD statement must contain the following libraries:

IMS RESLIB

PowerExchange hlq.LOAD

All libraries in the DFSESL concatenation must be APF-authorized.

You do not need to add the hlq . logger_name .USERLIB or hlq .CRG.LOAD to the DFSESL concatenation. However, the hlq.CRG.LOAD library must also be APF-authorized.

The IMS synchronous ECCR concatenates the data sets in the DFSESL DD statement in the control region and the data sets in the ESLLIB parameter to the data sets specified in the DFSESL DD statement in the dependent region. If necessary, the IMS synchronous ECCR allocates the DFSESL DD statement in the dependent region.

Use one or more of the following methods, which are listed in the search order, to construct the DFSESL concatenation for the dependent regions:

Include the DFSESL DD statement in the JCL of any IMS MPP and BMP dependent regions that update databases registered for capture.

Include the DFSESL DD statement in the IMS control region JCL.

Specify the libraries in the ESLLIB parameter of the EDMSDIR default options module.

The EDMSDIR module is created during PowerExchange installation. If you change the ESLLIB parameter in EDMSDIR, reassemble and relink the module by editing and running the job in the XICDC600 member of hlq.RUNLIB. For the IMS synchronous ECCR to use the updated EDMSDIR, you must stop and restart the affected IMS online regions.

The following example demonstrates a DFSESL concatenation constructed by the IMS synchronous ECCR. In this example, the following statement is specified in the IMS control region:

//DFSESL  DD DSN=IMS.SDFSRESL,DISP=SHR

The EDMSDIR module specifies ESLLIB=(hlq.LOAD). The dependent region contains no DFSESL DD statement.

The IMS synchronous ECCR concatenates this information to produce the following DFSESL concatenation in the IMS dependent region:

//DFSESL  DD DSN=IMS.SDFSRESL,DISP=SHR
//        DD DSN=hlq.LOAD,DISP=SHR

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CDC Guide for z/OS

CDC Guide for z/OS

Providing Access to the External Subsystem Modules

Providing Access to the External Subsystem Modules