IGGCSIVG is an assembler program that identifies unused space at the end of a VSAM data set. Basically, it computes the difference of the high-used and the high-allocated relative byte addresses (RBAs) for each VSAM data set in a given catalog. This program is useful in identifying over-allocated space.

Change the Binder/Linkage Editor SYSLIN DD statement to point to the linkage library for your installation. IGGCSIVG will run only with releases of DFSMS.

The input to IGGCSIVG is an 80-byte SYSIN DD record. The catalog name of the catalog to be processed must be left justified and start in column 1 of the input record. Multiple input records can be supplied.

IGGCSIVG prints a summary for each catalog name showing the total unused space by VSAM type. A total for all catalog names supplied is printed after the last catalog name is processed.