On 9/13/2016 11:55 AM, Jake Anderson wrote:
Can some one please explain the Catalog internals with respect to the VVDS
and VTOC.
At the 10,000 ft level...
The catalog is a VSAM KSDS dataset that (mostly) points to the volume
containing the dataset.
The VTOC contains where on the volume, by cylinder and track, any
datasets live, be they VSAM or non-VSAM.
The VVDS contains VSAM unique information for any VSAM datasets that are
contained in the VTOC.
A VSAM catalog entry is actually a composite of the catalog, the VTOC,
and the VVDS information merged together.
Regards,
Greg
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