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VSAM - What is a VSAM split?

asked mar September 4, 2014 11:59 AM  

What is a VSAM split?


1 Answers

answered By Mswami   0  

When the Control Interval does not have enough space, VSAM performs a split on CI by moving some of the records to the CIs that are free.

In case of non-availability of free space, VSAM performs a control area split. This is done by new control area allocation and moving half of the CIs to it.


  • The movement of some records into another free CI in the same CA CI Split needs certain number of Input / Output operations. This leads to degradation of VSAM file The correct space is needed to allocate for CI The result is half-empty CIs on contrary to one full and one empty CI.


  • CA Split is the process moving half of the records of one CA to a new CA. The addition or deletion of records can not accommodate in the existing CA The result is two half-full CAs on contrary to one full and one empty CA.
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