Temporary files

IMS HP Change Accumulation Utility dynamically allocates many temporary files that are necessary for processing JCL and control information.

These files each have default values that control allocation. The defaults are appropriate for most typical environments.

Occasionally, very large files are required (for example, RECON data sets and skeletal JCL). If the space or other allocation default parameters are not adequate for processing, then each temporary file can be pre-allocated by the user.

For batch executions, DD statements can be defined in the JCL.

For ISPF, the user can preallocate files using TSO ALLOC either directly or with the command file CLIST,REXX.