While going through material on VSAM, I read that RRDS vsam files do not support alternate index while KSDS and ESDS do so? Can someone throw some light what could be the reason for this? I am struggling to understand why alternate index is supported for KSDS and ESDS but is not for RRDS. Is there any specific technical reason why alternate index support is not provided or its just the way IBM designed it?

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