Catalog Basics – VVDS
By Blair Svihra, Dino-Software (10-minute read) *Restricted Member Content*
An ICF catalog is comprised of two entities: the Basic Catalog Structure (BCS) and the VSAM Volume Data Set (VVDS). Up until DFP 3, the VVDS was strictly used as a repository for describing the VSAM data sets physically residing on the volume with the VVDS. Variable length records residing in the VVDS, not the BCS, contain the critical information describing each VSAM entity such as extent information,… Read More