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

handling indexed vsam file sequentially


IBM Mainframe Forums -> COBOL Programming
Post new topic   Reply to topic
View previous topic :: View next topic  
Author Message
sreelekshmi

New User


Joined: 16 Jan 2007
Posts: 9
Location: Bangalore

PostPosted: Thu Jul 19, 2007 10:38 am
Reply with quote

I need to read an indexed vsam file sequentially from the beginning.If I give the access as 'DYNAMIC' and the passing LOW-VALUES to the key and then using START file name ,will it works?
Also do I need to use READ filename NEXT record or simple READ is enough?

If I need to read the file till the end of file,then every time do I need to used the READ fielname NEXT record statement?

Sree
Back to top
View user's profile Send private message
Aji

New User


Joined: 03 Feb 2006
Posts: 53
Location: Mumbai

PostPosted: Thu Jul 19, 2007 11:09 am
Reply with quote

Follow the below mentioned sequence.

Initialize the key.

Start file-name .....
p1.
Read file-name next record at end perform end-para.

Do the process

go to p1.

Aji
Back to top
View user's profile Send private message
kussu
Warnings : 1

New User


Joined: 16 May 2007
Posts: 33
Location: India

PostPosted: Thu Jul 19, 2007 4:13 pm
Reply with quote

U can give Access Mode as Sequential
Back to top
View user's profile Send private message
nagireddynarva

New User


Joined: 30 Apr 2005
Posts: 5
Location: hyderabad

PostPosted: Thu Jul 19, 2007 6:40 pm
Reply with quote

give access mode as sequential
Back to top
View user's profile Send private message
stodolas

Active Member


Joined: 13 Jun 2007
Posts: 632
Location: Wisconsin

PostPosted: Thu Jul 19, 2007 8:18 pm
Reply with quote

I've always been told that processing a VSAM sequentially is very bad from a performance perspective. I know at our shop, the system recognizes this kind of access and throttles your access so you get less CPU.
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 -> COBOL Programming

 


Similar Topics
Topic Forum Replies
No new posts How to split large record length file... DFSORT/ICETOOL 10
No new posts Extracting Variable decimal numbers f... DFSORT/ICETOOL 17
No new posts SFTP Issue - destination file record ... All Other Mainframe Topics 2
No new posts Access to non cataloged VSAM file JCL & VSAM 18
No new posts Need help for File Aid JCL to extract... Compuware & Other Tools 23
Search our Forums:

Back to Top