With NSR buffering, VSAM acquires a private pool of buffers for each file when it is opened. The storage allocated to these buffers is reserved for I/O from/to this file for the entire time that the file is open. At CLOSE time, these buffers are released back to the system.
VSAM provides parameters which allow you to specify the number of buffers assigned to a cluster. The VSAM buffer parameters are BUFFERSPACE, BUFND, and BUFNI.
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