Posted On: Feb 22, 2018
There are three types of datasets access methods used by VSAM. A dataset is a physical record made into a collection which is stored in disks. It is identified by MVS with labels.
All the records in VSAM files are either fixed or variable in length. They are all organized in fixed-size blocks which are known as Control Intervals. It is measured in bytes. When the size increases they are called Control Areas. These are measured in disk tracks or cylinders.
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CI is represented in the unit of 1/0..