IBM Mainframe Forum Index
 
Log In
 
IBM Mainframe Forum Index Mainframe: Search IBM Mainframe Forum: FAQ Register
 

help on ''AMP=('AMORG','BUFND=8','BUFNI=4'),''.


IBM Mainframe Forums -> JCL & VSAM
Post new topic   Reply to topic
View previous topic :: View next topic  
Author Message
srebba
Warnings : 1

New User


Joined: 26 Apr 2007
Posts: 37
Location: USA

PostPosted: Fri Jun 01, 2007 11:14 pm
Reply with quote

For VSAM files we can specify like the below for input file.
//SORTIN DD DSN=VSAM.VC,
// AMP=('AMORG','BUFND=8','BUFNI=4'),DISP=SHR
Without ''AMP=('AMORG','BUFND=8','BUFNI=4'),'' also we can code for VSAM file .
So for Non VSAM file we will not have like above
Please dont ask me what are ''AMP=('AMORG','BUFND=8','BUFNI=4'),''

can Any body can help on ''AMP=('AMORG','BUFND=8','BUFNI=4'),''.

Thank you,
Sree
Back to top
View user's profile Send private message
expat

Global Moderator


Joined: 14 Mar 2007
Posts: 8797
Location: Welsh Wales

PostPosted: Sat Jun 02, 2007 1:34 am
Reply with quote

Quote:
can Any body can help on ''AMP=('AMORG','BUFND=8','BUFNI=4'),''.

Yes, you are allocating buffers to the file, but I am amused/bemused by the combination.

If the file is Random access then I would allcoate more index buffers (BUFNI)

and if the access is sequential, then more data buffers for read ahead capability.

The 8:4 ratio is just an extrapolation of the standard 2:1 allocation which is the default.

Also remember that if the access is skip-sequential NEVER EVER allocate a large number of buffers.
Back to top
View user's profile Send private message
View previous topic :: :: View next topic  
Post new topic   Reply to topic View Bookmarks
All times are GMT + 6 Hours
Forum Index -> JCL & VSAM

 


Similar Topics
Topic Forum Replies
No new posts Clarification regarding BUFNI & B... JCL & VSAM 14
No new posts BUFND & BUFNI JCL & VSAM 2
No new posts VSAM - BUFNI and BUFND optimum values JCL & VSAM 5
No new posts BUFNI and BUFND size JCL & VSAM 4
No new posts BUFNI calculation under VSAM for EXTV... JCL & VSAM 2
Search our Forums:

Back to Top