Indexed VTOCs

For indexed VTOCs, there are two types of formatted listings. These types are specified using the INDEXDSN parameter.

If INDEXDSN is omitted, the listing contains:

A statement of the number of levels in the index, if enabled.
A formatted Format 4 DSCB.
Formatted data set entries in alphanumeric order (Format 1 and Format 8 DSCB physical-sequential order if the index is disabled).
Formatted freespace information.
Totals of unallocated cylinders, unallocated tracks, unallocated (Format 0) DSCBs, and unallocated VIRs.

If INDEXDSN=name is specified, the listing contains, in addition to the items above:

Formatted space and allocation information.
Allocated VTOC index entry records, formatted and listed by level and key sequence within level (in physical-sequential order if the index is disabled).
If the VTOC index is disabled, a statement is included to this effect.

Related reading: For a sample of the first edited format illustrating how each DSCB will appear in the listing, see IEHLIST VTOC Listing.