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What (who) is Keyed Sequenced Data Set - definition
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Wikipedia
A key-sequenced data set (KSDS) is a type of data set used by IBM's VSAM computer data storage system.: 5 Each record in a KSDS data file is embedded with a unique key.: 20 A KSDS consists of two parts, the data component and a separate index file known as the index component which allows the system to physically locate the record in the data file by its key value.: 13 Together, the data and index components are called a cluster.: 15
Records can be accessed randomly or in sequence and can be variable-length.
As a VSAM data set, the KSDS data and index components consist of control intervals: 10 which are further organized in control areas.: 12 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 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.: 17
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.: 15 An alternate index is itself a KSDS.: 16
