Portal | Manuals | References | Downloads | Info | Programs | JCLs | Mainframe wiki | Quick Ref
IBM Mainframe Computers Forums Index
 
Register
 
IBM Mainframe Computers Forums Index Mainframe: Search IBM Mainframe Forum: FAQ Memberlist Profile Log in to check your private messages Log in
 
Will BLKSIZE reduce cost

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

New User


Joined: 29 Aug 2006
Posts: 15

PostPosted: Tue Mar 18, 2008 12:07 am    Post subject: Will BLKSIZE reduce cost
Reply with quote

Hi ,

I have a question here. Say If we code BLKSIZE = 0 will the cost be reduced.

From teh following which is the efficient way of coding and why?

1. DCB=(RECFM=FB,LRECL=206,BLKSIZE=0),
2. DCB=(RECFM=FB,LRECL=206,BLKSIZE=2060)
3. DCB=(RECFM=FB,LRECL=206,BLKSIZE=4120)


In which case the cost will be less?????????????

Thanks,
Deepak
Back to top
View user's profile Send private message

cpuhawg

Active User


Joined: 14 Jun 2006
Posts: 331
Location: Jacksonville, FL

PostPosted: Tue Mar 18, 2008 1:01 am    Post subject: Reply to: Will BLKSIZE reduce cost
Reply with quote

Using number #1 would cost less. When you block records with the most efficient blocksize, you are able to store the maximum records per track. If you are not using the optimum blocksize, fewer records are stored per track, so you need addition space to handle the complete file. When the system reads records, there is also a small CPU savings when unblocking records stored at their optimum blocksize because there are fewer blocks for the CPU to unblock into individual records.
Back to top
View user's profile Send private message
deesun

New User


Joined: 29 Aug 2006
Posts: 15

PostPosted: Tue Mar 18, 2008 1:50 am    Post subject: Reply to: Will BLKSIZE reduce cost
Reply with quote

Thanks for your response
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 Speed-up/reduce CPU use of code prino PL/I & Assembler 0 Tue Sep 26, 2017 12:05 am
No new posts Wanted to calculate TRK when i have B... Balu5491 JCL & VSAM 10 Wed Jul 19, 2017 5:43 pm
No new posts Reduce CPU Times for Join Sort santoshn SYNCSORT 12 Sat Jun 10, 2017 1:40 pm
No new posts Report cost in CA-dispatch Nileshkul CA Products 3 Wed Jun 07, 2017 10:32 pm
No new posts Allocate dataset withour BLKSIZE Susanta CLIST & REXX 2 Thu Sep 22, 2016 11:51 am

Facebook
Back to Top
 
Job Vacancies | Forum Rules | Bookmarks | Subscriptions | FAQ | Polls | Contact Us