翻訳と辞書
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・ Key position player
・ Key Poulan
・ Key Publications
・ Key Publishing
・ Key relevance
・ Key Resolve
・ Key retainer
・ Key Ring (software)
・ Key ring file
・ Key Risk Indicator
・ Key Rock, West Virginia
・ Key Route Inn
・ Key Salan
・ Key schedule
・ Key selection vector
Key Sequenced Data Set
・ Key server
・ Key server (cryptographic)
・ Key signature
・ Key signature (cryptography)
・ Key signature names and translations
・ Key signing party
・ Key silverside
・ Key size
・ Key Skills Qualification
・ Key Sounds Label
・ Key Sounds Label discography
・ Key space
・ Key space (cryptography)
・ Key square


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Key Sequenced Data Set : ウィキペディア英語版
Key Sequenced Data Set
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.
==See also==

*Entry Sequenced Data Set
*Relative Record Data Set

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Key Sequenced Data Set」の詳細全文を読む



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