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VSAM - What are the different types of VSAM files available?




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asked mar August 7, 2014 11:15 AM  

What are the different types of VSAM files available?


           

1 Answers



 
answered By Mswami   0  

Key Sequenced Data Set (KSDS), where each record is identified for access by specifying its key value - a sequence of characters embedded in each data record which uniquely identify that record from all other records in the dataset.  KSDS datasets are similar to Indexed Sequential Access Method (ISAM) datasets, with many of the same characteristics, but also having distinct advantages over ISAM.

Entry Sequenced Data Set (ESDS), where each record is identified for access by specifying its physical location - the byte address of the first data byte of each record in relationship to the beginning of the dataset.  ESDS datasets are similar to Basic Sequential Access Method (BSAM) or Queued Sequential Access Method (QSAM) datasets.

Relative Record Data Set (RRDS), where each record is identified for access by specifying its record number - the sequence number relative to the first record in the dataset.  RRDS datasets are similar to Basic Direct Access Method (BDAM) datasets.

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