Question about GDG

arun nehra · New User Joined: 29 Nov 2008 Posts: 62 Location: mumbai

Hi,

Can any one tell if the current GDG version can be refernced without specifying version specifier i.e. (+0) etc.

I am facing this issue in a copy step using IEBGENER utility; where a GDG file AAAA.BBBB(+0) is referred as AAAA.BBBB.

Regards
Arun

Robert Sample · Posted: Fri Dec 11, 2009 6:23 pm

Terminology note: version and generation are both valid terms for a GDG and mean extremely different things. There can only be one version of a generation cataloged at a time while there can be multiple generations in the catalog. You need to figure out which you are referring to by reading the manuals (link at the top of the page) until you understand this.

If the GDG base name is used without a relative or absolute generation reference, you are not getting the current GDG generation. You are getting all cataloged generations.

And why are you adding to a topic that has been inactive for 3 and 1/2 years?

expat · Posted: Fri Dec 11, 2009 6:23 pm

Please DO NOT add your topic onto an existing thread, especially one that has been happily dormant for almost 4 years

When talking about GDS it is important to use the correct terminology, as both version and generation are both valid in terms of a GDS.

It is a well known fact that only one version of a GDS may exist at any one time, however, multiple generations may exist together.

Please learn and use the correct terminology when posting, as using the wrong term can cause confusion and possibly delay a resolution to your problem

Your question is not clear. Please try again and also post the JCL in question.

PeterHolland · Posted: Fri Dec 11, 2009 6:24 pm

Sure you can do that, the result will be that you are allocating all members
of that GDG group.
And if there are a lot of GDG entries in that group a lot of people will not
be happy, especially if they are tape datasets.

arun nehra · New User Joined: 29 Nov 2008 Posts: 62 Location: mumbai

Thanks Peter for your advice...

PeterHolland · Posted: Fri Dec 11, 2009 7:08 pm

Damn Robert and expat, we are almost clashing with our responses at the same time.
Maybe we first pm each other to make response deals?

Robert Sample · Posted: Fri Dec 11, 2009 7:16 pm

Peter: coordinated responses? What a radical idea!

expat · Posted: Fri Dec 11, 2009 7:17 pm

Peter: coordinated responses? What a radical idea!

PeterHolland · Posted: Fri Dec 11, 2009 11:01 pm

Hell, i was just to trying to get intimated with you guys.

dick scherrer · Posted: Fri Dec 11, 2009 11:15 pm

arun nehra · New User Joined: 29 Nov 2008 Posts: 62 Location: mumbai

Hi,

I am creating new GDG generation member using (+1) suffix in first step. then in next step i want to compare the current (one created above) and the privious (older) generation member. How should i reference the both.

As far as i know the new member can be referenced by giving (+0) suffix, but if that is the case then what about older one, is it (-1)?

Regards

Robert Sample · Posted: Fri Jan 15, 2010 4:02 pm

As long as the job is running, every relative reference to a particular generation must be the same. If you created (+1) in step 1 of your job and want to reference that file in step 3 of the same job, you must use (+1) in step 3. The (+0) generation is the generation that was the latest before the job started running -- and remains so until the job is done, at which time it becomes the (-1) generation.

This is all explained in the JCL reference manual which can be reached from the manuals link at the top of the page.