The VSAM consists of datasets used to store the data and are referred to as clusters. Index, sequence set, and data portion of a dataset are all grouped into clusters. Each VSAM cluster occupies an area divided into contiguous areas called CI (Control Intervals). A VSAM cluster consists of two main components:
- Index Component: This component consists of the index part. VSAM retrieves records from the data component using the index component.
- Data Component: This component contains the data. It contains the actual data records.
