DFRXDYN0 user exit

When the log data sets are allocated dynamically, you can use the DFRXDYN0 user exit to provide data set names.

IMS DEDB Fast Recovery calls this exit routine, and the routine assigns a fully qualified name for the dynamic allocation of WADS, OLDS, or SLDS. If the user exit routine is contained in the load module data set specified in the STEPLIB DD statement, the routine is used.