Examples of file structure

• Control‑D User Report List files are indexed by recipient name, job name and record creation timestamp.
• Control‑M/Analyzer Group Definition files are indexed by group name.

Data and index components may extend beyond one physical dataset. Initially, however, a component is allocated as a single physical dataset called the primary extent.

To increase an IOA Access Method file component’s capacity, a maximum of 255 secondary extent datasets can be allocated and formatted. Using an IOA Access Method definition option, secondary extent allocation and formatting can automatically be performed when an out‑of‑space condition occurs.

Note: Secondary extents are supported only in Control‑D, Control‑V, and Control‑M/Tape.