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The VSAM Resource – Directory & Links
From Mainframes.in – Home of Legacy & Mainframes Online
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The VSAM section of Mainframes.in provides a listing of WWW resources for VSAM database systems. Mainframes.in is a comprehensive online resource for legacy and mainframe systems.
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Contents derived from Wikipedia article on VSAM
Virtual storage access method - From Wikipedia, the free encyclopedia
Virtual Storage Access Method (VSAM) is an IBM disk file storage scheme first used in the OS/VS2 operating system and later used throughout the MVS architecture. VSAM comprises four access methods: Key Sequenced Data Set (KSDS), Relative Record Data Set (RRDS), Entry Sequenced Data Set (ESDS) and Linear Data Set (LDS). See record-oriented filesystem.
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 program IDCAMS is commonly used to manipulate ("delete and define") VSAM 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 DB2 are implemented on top of VSAM and use its underlying data structures.
References http://www.redbooks.ibm.com/redbooks/SG246105/wwhelp/wwhimpl/js/html/wwhelp.htm
End of Wikipedia content, http://en.wikipedia.org/wiki/VSAM
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Reference
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Have you checked out the GeoDig directories for over 30 countries? GeoDig provides useful local and regional web resources for over 200 cities around the world. See the list of cities and countries for which GeoDig provides locality-specific web resources.
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