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Module 2: VSAM Concepts

LDS – Linear Data Set

  • An LDS dataset is similar to ESDS in terms of organization.
  • A linear data set (LDS) contains data that can be accessed as byte-addressable strings.
  • In LDS, Control Interval size must be multiples of 4096 bytes
  • LDS have only data component.
  • LDS CI does not have control information and thus CI do not maintain CIDF or RDF
  • Thus, all bytes are data bytes.
  • Mostly used by DB2, which is IBM’s primary relational management system
  • You specify the LDS organization with the IDCAMS DEFINE command specifying the LINEAR parameter.
  • Below figure depicts internal organization of LDS

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