On Fri, 18 Sep 2020 17:34:17 +0800, Brian Fraser wrote:
>Why can't his jobs generate dsns like HLQ.FICHE.TAPE.D091720.T1123 ?
>Can use system symbols to generate the date and time in the JCL output DD.
>
I understand that system symbols are not supported in JCL DSNs because of
o ambiguity between EXECSYS and CNVTSYS
o queue latency -- the job might run at a time not matching the JCL symbols.
(If the actual date and time values are important I understand they
may be invalid because around midnight date and time might be
fetched on different days, resulting in a 23+ hour error. Murphy
says this will only be a problem when it matters. Rexx can do it
right; why can't JCL?)
>On Fri, 18 Sep 2020 at 15:36, Brian Westerman wrote:
> ... So over time, they ended up
>> with about 30,000 tapes from the over 9,000 jobs that CA-1 keeps around
>> until expiration date.
>>
>> The problem is that they want to know if there is a way to automatically
>> catalog datasets at creation time, to which I told them we could, but only
>> 1 of them because you can't catalog two datasets with the same name. But
>> they want to have "the system" which I'm guessing is me :), dynamically
>> rename these datasets at creation time to add a date and time, such as
>> change HLQ.FICHE.TAPE to which I would dynamically make it
>> HLQ.FICHE.TAPE.D091720.T1123, meaning today's date and the current time (if
>> it was 11:23am).
>>
Use the seconds also, as D200917.T112359. With thousands of entries
a collision is likely. And use YYMMDD for the date for easy sorting of
displays.
Is it possible to rename a tape data set? That would seem to require
overwriting the HDR1 label, but tapes can't be updated in place.
I'm imagining a sequence such as:
Momentarily catalog HLQ.FICHE.TAPE
DEFINE ALIAS HLQ.FICHE.TAPE.D200917.T112359
SYMBOLICRELATE HLQ.FICHE.TAPE
Uncatalog HLQ.FICHE.TAPE. I understand that symbolic aliases
remain when the RELATED name is uncatalogued.
-- gil
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: INFO IBM-MAIN
