I'm just curious as to why IBM chose to create the VRRN type of VSAM file. I understand a normal RRN (NUMBERED). In both cases, the record is addessed by relative record number. But I don't really see the need for a VRRN. Why not just have a KSDS with a 4 byte key at offset 0? Is it to remove the relative record number from the user record?And, I guess, so that you can't change the "record number" by updating the key. Just curious.
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