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What do you mean by Cluster in VSAM?

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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:

  1. Index Component: This component consists of the index part. VSAM retrieves records from the data component using the index component.
  2. Data Component: This component contains the data. It contains the actual data records.

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