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cat mainframe -> IBM Mainframe |
Added See-also link to IBM Utility programs, like the IDCAMS mentioned in the text. |
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VSAM records can be of fixed or variable length. They are organised in fixed-size blocks called Control Intervals (CIs), and then into larger divisions called Control Areas (CAs). Control Interval sizes are measured in bytes — e.g. 4K — while Control Area sizes are measured in disk tracks or cylinders.
The utility program IDCAMS is commonly used to manipulate ("delete and define") VSAM [[Dataset|datasets]]. Custom programs can access VSAM datasets through data definitions (DD's) in Job Control Language ([[JCL]]) or in online regions such as [[CICS]] (Customer Information Control Systems.)
Both [[IMS/DB]] and [[IBM DB2|DB2]] are implemented on top of VSAM and use its underlying [[Data_structure|data structures]].
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* [[CICS]]
* [[JCL]]
* [[IBM_mainframe_utility_programs]]
* [[ISAM]]
* [[Geneva ERS]]
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