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control interval (CI)

(1) A fixed-length area of direct access storage in which VSAM stores records and creates distributed free space. The control interval is the unit of information that VSAM transmits to or from direct access storage. A control interval always includes an integral number of physical records.
(2) In a key-sequenced data set or file, the set of records that an entry in the sequence-set index record points to.

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