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.