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- Q3219655 subject Q7145958.
- Q3219655 abstract "A Key Sequenced Data Set (KSDS) is a type of data set used by the IBM VSAM computer data storage 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 index file 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.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 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 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.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.".
- Q3219655 wikiPageExternalLink d002303.htm.
- Q3219655 wikiPageExternalLink wwhelp.htm.
- Q3219655 wikiPageWikiLink Q1172284.
- Q3219655 wikiPageWikiLink Q1514276.
- Q3219655 wikiPageWikiLink Q2425682.
- Q3219655 wikiPageWikiLink Q37156.
- Q3219655 wikiPageWikiLink Q5380828.
- Q3219655 wikiPageWikiLink Q580427.
- Q3219655 wikiPageWikiLink Q66221.
- Q3219655 wikiPageWikiLink Q7145958.
- Q3219655 comment "A Key Sequenced Data Set (KSDS) is a type of data set used by the IBM VSAM computer data storage 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 index file known as the index component which allows the system to physically locate the record in the data file by its key value.".
- Q3219655 label "Key Sequenced Data Set".