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data set, the KSDS data and index components consist of control intervals which are further organized in control areas. As records are added at random to a KSDS, control intervals fill and need to be split into two new control intervals, each new control interval receiving roughly half of the
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records. Similarly, as the control intervals in a control area are used up, a control area will be split into two new control areas, each new control area receiving roughly half the control intervals.
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While a basic KSDS only has one key (the primary key), alternate indices may be defined to permit the use of additional fields as secondary keys. An alternate index is itself a KSDS.
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known as the index component which allows the system to physically locate the record in the data file by its key value. Together, the data and index components are called a cluster.
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system. Each record in a KSDS data file is embedded with a unique key. A KSDS consists of two parts, the data component and a separate
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