Portal | Manuals | References | Downloads | Info | Programs | JCLs | Master the Mainframes
IBM Mainframe Computers Forums Index
 
Register
 
IBM Mainframe Computers Forums Index Mainframe: Search IBM Mainframe Forum: FAQ Memberlist Usergroups Profile Log in to check your private messages Log in
 

 

Maximum allocation attributes for a VSAM.

 
Post new topic   Reply to topic    IBMMAINFRAMES.com Support Forums -> JCL & VSAM
View previous topic :: :: View next topic  
Author Message
ajay_udl

New User


Joined: 10 Oct 2006
Posts: 29

PostPosted: Thu Aug 07, 2008 9:44 am    Post subject: Maximum allocation attributes for a VSAM.
Reply with quote

Hi All,

I have a VSAM file which is an input to a pgm.
I'm reading it in I-O mode, so that i can update it through the pgm.
The VSAM will be having a huge amount of data, and it may exceed to the maximum limit.

I wanted to define the VSAM in such a way that it can accomodate the maximum amount of data.

Could any one share the attributes for such a KSDS.

Thanks
Ajay.
Back to top
View user's profile Send private message

expat

Global Moderator


Joined: 14 Mar 2007
Posts: 8593
Location: Back in jolly old England

PostPosted: Thu Aug 07, 2008 11:38 am    Post subject:
Reply with quote

Well so far you have told us what you want to do, but absolutely nothing to help you resolve your problem.

What are the record attributes, and how many records do you estimate will exist.

What are the current cluster definitions for that VSAM file.
Back to top
View user's profile Send private message
dick scherrer

Site Director


Joined: 23 Nov 2006
Posts: 19270
Location: Inside the Matrix

PostPosted: Thu Aug 07, 2008 7:37 pm    Post subject:
Reply with quote

Hello,

I believe you have this part of the analysis somewhat turned around.

The proper way to estimate is to determine how much data & index & + is needed to accomodate the data requirement. Then calculation can begin on how that translates to physical space.

Knowing the biggest possible vsam file in all of mainframe land should not enter into considertation.
Back to top
View user's profile Send private message
Robert Sample

Global Moderator


Joined: 06 Jun 2008
Posts: 7935
Location: Bellevue, IA

PostPosted: Fri Aug 08, 2008 4:37 am    Post subject:
Reply with quote

Quote:
I wanted to define the VSAM in such a way that it can accomodate the maximum amount of data.

Could any one share the attributes for such a KSDS.
Not without a LOT more information. There's many variables involved in VSAM file allocations and you really need to provide concrete data rather than just trying for the maximum and going backwards. Besides, the space management people at your site might not be happy if you try to allocate such a huge VSAM file without discussing it with them beforehand.
Back to top
View user's profile Send private message
View previous topic :: :: View next topic  
Post new topic   Reply to topic    IBMMAINFRAMES.com Support Forums -> JCL & VSAM All times are GMT + 6 Hours
Page 1 of 1

 

Search our Forum:

Similar Topics
Topic Author Forum Replies Posted
No new posts Fail to change physical VSAM filename... jacobdng CICS 7 Fri Jan 20, 2017 12:36 pm
No new posts how to recover an uncataloged VSAM da... archanamuthukrishnan All Other Mainframe Topics 3 Wed Jan 11, 2017 6:18 pm
No new posts Underlying DB2 VSAM LDS - SMF recording vasanthz All Other Mainframe Topics 6 Thu Jan 05, 2017 4:20 am
No new posts REXX DB2: Dynamic allocation of DB2.D... BHAS CLIST & REXX 3 Mon Dec 19, 2016 8:26 pm
No new posts BWO option in VSAM blayek CICS 3 Sat Nov 05, 2016 10:47 am


Facebook
Back to Top
 
Mainframe Wiki | Forum Rules | Bookmarks | Subscriptions | FAQ | Tutorials | Contact Us