VSAM groups Individual Data records in to larger units of storage. These units of storage are called Control Intervals.
A Control Interval is the amount of data transfered between the auxiliary storage and virtual storage.
Control Interval has 4 components.
1) Data
2) Control Interval Descriptor Field (CIDF)
3) Record Descriptor Field (RDF)
4) Free Space.
CIDF - Contains the information about the free space within the CI.
RDF - Contains the information about the records within the data space.
Free Space - The Space between the Records and the Control Information is free space.
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