System definition file utility program (DFHCSDUP)

The CICS® system definition utility program, DFHCSDUP, is a component of resource definition online (RDO). DFHCSDUP is an offline utility program that allows you to read from and write to a CICS system definition (CSD) file, either while CICS is running or while it is inactive.

You can use the DFHCSDUP program to:

See Resource management utility DFHCSDUP commands for information on each of these commands.

Note that the DFHCSDUP utility opens the CSD in non-RLS mode (even if you request RLS access on your JCL). This means that, if you access the CSD from CICS in RLS mode, it cannot be open when you run DFHCSDUP. The reason for the restriction is that the DFHCSDUP utility does not have the capabilities that are needed in order to open a recoverable file in RLS mode. The restriction also applies, however, if your CSD is nonrecoverable.

You can invoke the DFHCSDUP program in two ways:

  1. As a batch program (see topic Invoking DFHCSDUP as a batch program.)
  2. From a user program running either in batch mode or in a TSO environment (see topic Invoking the DFHCSDUP program from a user program).

Related concepts
What is resource definition?

Related reference
Sharing the CSD between CICS Transaction Server for z/OS, Version 3 Release 1 and earlier releases
Input and output for the DFHCSDUP program
Invoking DFHCSDUP as a batch program
Invoking the DFHCSDUP program from a user program
Rules for the syntax and preparation of commands for the DFHCSDUP program
Command processing in DFHCSDUP following internal error detection
Resource management utility DFHCSDUP commands
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