| View previous topic :: View next topic |
| Author |
Message |
Magesh_J
Intermediate
Joined: 21 Jun 2014
Posts: 259
Topics: 54
|
 Posted: Thu Sep 21, 2017 6:05 pm Post subject: Set ACB parameter for a VSAM file |
 |
|
Hi,
Please advise, how do i change/set ACB parameter for vsam dataset in batch.
Example :
| Code: | | //VSAM1 DD DSN=VSAMDATA,DISP=SHR,AMP=('ACCBIAS=SW') |
For above vsam dataset, i need to set MACRF=(NSR,SEQ,DIR,OUT,SKP)
How do i set it or where do i set this option.
Thanks
Magesh |
|
| Back to top |
|
 |
kolusu
Site Admin
Joined: 26 Nov 2002
Posts: 12375
Topics: 75
Location: San Jose
|
| Posted: Fri Sep 22, 2017 11:13 am Post subject: |
|
|
Magesh_J,
With ACCBIAS=SW you are already getting SEQ,SKP
If you want both Direct access and sequential access of records change it to ACCBIAS=DW
Look up Table 14. SMB access bias guidelines in z/OS DFSMS Using Data Sets Here
http://publibz.boulder.ibm.com/epubs/pdf/dgt3d410.pdf
Read Chapter 10. Optimizing VSAM Performance
_________________
Kolusu
www.linkedin.com/in/kolusu |
|
| Back to top |
|
|
Magesh_J
Intermediate
Joined: 21 Jun 2014
Posts: 259
Topics: 54
|
| Posted: Fri Sep 22, 2017 1:05 pm Post subject: |
|
|
Thanks Kolusu for the kind response.
All i need is make my program/jcl use NSR buffer instead of LSR
When we specify AMP=('ACCBIAS=DW') It switches to LSR resulting in performance problem.
When i specify AMP=('BUFND=39,BUFNI=139') , It is running very good.
But the problem is BUFNI will always varies based on the calculation
| Code: |
BUFNI = TI - (HURBA / CASIZE) + STRNO
|
All I need is AMP=('ACCBIAS=DW') and NSR Buffer.
I see following program in the book, but not sure how to write or where to write and how to invoke for my vsam file.
| Code: |
START CSECT
SAVE(14,12) Standard entry code
.
B INIT Branch around file specs
MASACB ACB DDNAME=MASDS,AM=VSAM, File specs X
MACRF=(KEY,SEQ,OUT), X
EXLST=EXITS, X
RMODE31=ALL
END
|
Thanks
Magesh |
|
| Back to top |
|
|
kolusu
Site Admin
Joined: 26 Nov 2002
Posts: 12375
Topics: 75
Location: San Jose
|
| Posted: Fri Sep 22, 2017 11:28 pm Post subject: |
|
|
Magesh_J,
You need to have a dataclass that supports SMB. Talk to your systems programmer and have the VSAM dataset in a dataclass with SMB
_________________
Kolusu
www.linkedin.com/in/kolusu |
|
| Back to top |
|
|
Magesh_J
Intermediate
Joined: 21 Jun 2014
Posts: 259
Topics: 54
|
| Posted: Tue Sep 26, 2017 6:27 pm Post subject: |
|
|
Thanks Kolusu, Will check with System programmer.
Regards,
Magesh |
|
| Back to top |
|
|
|
|
|
FAQ
Search
Quick Manuals
Register
Profile
Log in to check your private messages
Log in
