How to identify how many generations should be used to GDG?

Joe_Song · New User Joined: 22 Jan 2008 Posts: 18 Location: china

I want to know how i can know how many generation GDG should be defined when i create a new GDG?
what's the standard?

Gnanas SNG · Posted: Thu Apr 03, 2008 3:36 pm Post subject:

255...
If I understand your question correctly...

shrivatsa · Active User Joined: 17 Mar 2006 Posts: 153 Location: Pune

Yes Gnanas,

Standard is 255, But as per the requirement he needs to look into that how many generations he needs

expat · Posted: Thu Apr 03, 2008 3:46 pm Post subject:

The simple answer is .............. How many do you NEED

rajeshwarch · New User Joined: 24 Mar 2008 Posts: 4 Location: mumbai

you have a parameter LIMIT, if u r creating GDG using IDCAMS utility.
we can give limit=0 to 255, means that much generations are only cataloged at a time. after reaching the limit u can uncatalog or delete the generations.

Joe_Song · New User Joined: 22 Jan 2008 Posts: 18 Location: china

what i want to say is that when i got a requirment , and if need to create a GDG, i want to know how i can know how many generations i should to setup, like limit = 20 or 30? give a sample.

enrico-sorichetti

How in heaven are we supposed to know what limit You should define

ask the application/data analyst,

for example ... for a daily process with a weekly accumulation

You could define at the daily dataset with a 7 limit
and the weekly accumulation dataset with a 52 limit
... but thats only a sample based on calendar peculiarities,
not on application design

but again any number You choose without asking the designer is bound to be wrooong[/quote]

Anuj D. · Posted: Thu Apr 03, 2008 10:50 pm Post subject:

Hi,

This sentence has the key to start

dick scherrer · Posted: Fri Apr 04, 2008 12:36 am Post subject:

Hello,

Said a bit differently, a gdg is not typically defined until it has been determined how many previously created copies of the data might be needed.