CA Compress/2 › Using CA Compress/2 Under CICS › Install the Callable SHRINK Subroutines for CICS › Step 1. Specify the FDT Names and a Fullword in the CWA

Step 1. Specify the FDT Names and a Fullword in the CWA

In the CICS CA Compress/2 source library:

• Edit member SHRKWORD to specify the offset from the start of the CWA of an aligned fullword in the CWA to be used exclusively by CA Compress/2 for CICS.
• Edit member FDTNAMES to specify the names of the FDTs for the data sets used with CA Compress.

  If you need to change the offset of the reserved fullword, you must repeat this and reassemble using INSTALL. If converting from the macro level interface, you must change SHRKWORD to the offset from the CWA, not the CSA.

  For seldom used files, you can omit the record in FDTNAMES specifying the corresponding FDT, because the FDT is loaded dynamically as needed, along with about 3K of storage for each transaction. This storage, and the dynamically loaded FDT, is freed when it is no longer needed. Because each FDT may use between 4 and 8K of storage, save storage in this way or, whenever appropriate, use a single FDT for several files.

  CICS CA Compress/2 for CICS can issue the following CICS transaction abends:

  SHR1 - SHRKWORD NOT INITIALIZED OR DdOES NOT POINT TO SHRKSCBS
  SHR2 - NO RETURN CODE PARAMETER PASSED TO SHRKSTUB
  

  The CICS interface requires a return code argument which is optional in batch. This prevents CICS from ABENDing on CA Compress/2 errors. Correct the application program so that it passes a return code parameter.

  The names of FDTs prefixed by SCB in the FDTNAMES member are the FDTs that are loaded into storage at CICS startup. Edit this member as needed.