I am reading VSAM Demistified redbook, topic 'The loss of useful space in Data CA' (4.1.2 ); page no (204); In this, it is explained that:
In the Index set, each CI has only one record. Each record has a pointer to
the highest possible key in an index record in the next lower level, and a
pointer to the beginning of that index record.
reference figure 4-1
My doubt is how many levels will be present in the INDEX Set and on what it depends?