Thanks Basically I was looking how IBM catalog programes makes call with respect to the VVDS and VTOC.
Just trying to understand internally how they synchronize and logics. I am not trying to resolve anything but just curious if IBM has documented anywhere. On Sep 14, 2016 1:50 AM, "Richard Pinion" <[email protected]> wrote: > The VVDS contains VVR and NVR records. VVR's describe VSAM data sets, > while NVR's describe non-VSAM data sets. > > > > --- [email protected] wrote: > > From: Greg Dyck <[email protected]> > To: [email protected] > Subject: Re: Internals of Catalog > Date: Tue, 13 Sep 2016 15:13:37 -0500 > > 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 > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > > > > > _____________________________________________________________ > Netscape. Just the Net You Need. > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
