The preloader control file
A control file identifies the IBM Transformation Extender maps and database query (.mdq) files that the IBM Transformation Extender CICS preloader utility loads into memory. You allocate the DTXnnnIN preloader control file in the CICS startup JCL.
The ddname of the preloader control file resource must be
DTXnnnIN, where nnn is the IBM Transformation Extender version, for example
DTX841IN. The preloader control file must have a fixed-block record format
(RECFM=FB).
For
example, the following DD statement allocates a preloader control
file that is named KEYWORD.MAP in the CICS startup
JCL:
//DTX841IN DD DSN=KEYWORD.MAP DISP=SHRThe preloader control file cannot be the DnnnMAP VSAM file (where nnn is the IBM Transformation Extender version).