>From a vague memory, the Vnn was to be used if you had to do a "file fix" type >operation and recreate a specific generation. The system did not help with a >way to do this, but if you did it yourself by deleting the V00 version and the >cataloguing a V01 (and now-a-days do a ROLLIN), you could access the V01 >version using the same relative generation. Or you could do something like:
//FIXFILE EXEC PGM=FILEFIX //INPUT DD DSN=GDG.G0127V00,DISP=(OLD,DELETE,KEEP) //OUTPUT DD DSN=GDG.G0127V01,DISP=(NEW,CATLG,DELETE), // ... OTHER PARAMETERS //* then the GDG.G0127V01 would replce GDG.G0127V00 as GDG(-n). And it would be documented that this was a different version, in records such as SMF. I don't remember anybody ever doing it. Personally, I sort of like the UNIX way where I put the ISO date & time (ISO 8601 / RFC 3339 format) as the last node. Wish I had a simplier way to do it. Note that it is exactly difficult. Just "fiddly" to me. -- John McKown Systems Engineer IV IT Administrative Services Group HealthMarkets(r) 9151 Boulevard 26 * N. Richland Hills * TX 76010 (817) 255-3225 phone * [email protected] * www.HealthMarkets.com Confidentiality Notice: This e-mail message may contain confidential or proprietary information. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. HealthMarkets(r) is the brand name for products underwritten and issued by the insurance subsidiaries of HealthMarkets, Inc. -The Chesapeake Life Insurance Company(r), Mid-West National Life Insurance Company of TennesseeSM and The MEGA Life and Health Insurance Company.SM > -----Original Message----- > From: IBM Mainframe Discussion List > [mailto:[email protected]] On Behalf Of Roberts, John J > Sent: Monday, June 11, 2012 2:59 PM > To: [email protected] > Subject: Re: Weird thought on misuse of a GDG. > > > But in today's world, without SCRATCH in the definition, > the oldest GDG does not get scratched. It gets "rolled off" > the GDG base and becomes a "normal" cataloged dataset entry. > So it stays in the catalog, and can be referenced by absolute > name. I wonder if this would ever be of some use to anyone. > > What happens when you hit G9999V00? Does it wrap to G0000V00 > or G0001V00? If so, you could be attempting to catalog a > name that already exists. Not a problem for most generation > datasets, but I would guess that someone would trip over this > someday. Especially if z/OS lasts another 50 years ;-) > > Also, what is the significance of the V00 part of the > qualifier? I was always led to believe that it was a vestige > of something that was never implemented. > > ---------------------------------------------------------------------- > 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
