VSAM

VSAM LISTCAT provides information that interprets the actual situation of VSAM data sets. This information includes counts of:
  • Whether and how often control interval (CI) or control area (CA) splits occur (splits should occur very rarely).
  • Physical accesses to the data set.
  • Extents for a data set (secondary allocation). Avoid this secondary allocation, if possible, by making the primary allocation sufficiently large.
  • Index levels.