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What do you mean by Control Interval (CI) and Control Area (CA)?

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In the data component of the VSAM cluster, each data record is stored as a part of a unit called the Control Interval (CI), and each Control Interval is stored in a unit called the Control Area (CA).

  • Control Interval (CI): It is a contiguous storage area that VSAM uses to store data records and other control information. A block represents a unit of data being transferred between memory and storage devices in non-VSAM data management methods. CI presents a unit of data transferred between the storage device (DASD) and memory (buffer) in VSAM. A control interval size is specified at the time the cluster is defined. The size of Control Intervals is measured in bytes. For example, 2 kilobytes.
  • Control Area (CA): A control area consists of several CI (Control intervals). Depending on the number of records, a VSAM dataset consists of one or more CAs. Data records are grouped into CIs, and Control Intervals are grouped into CAs. Sizes of Control Areas are measured in cylinders or disk tracks.

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