VSAM confusion

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Ivearrived
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Posts: 1
Joined: Sun Dec 09, 2007 10:58 am

VSAM confusion

Post by Ivearrived » Mon Dec 10, 2007 4:47 pm

I have a few basic questions in mainframe . I am not experienced in mainframes . Maybe these questions reflect the lack of experience

What are the vsam files that we normally use in our programs . Are they KSDS,ESDS or RRDS .

For random access of data from a file , do we normally use vsam files in our programs or can we use Direct access files . I really don't know what is the difference between a VSAM KSDS file and a Direct access Indexed file (if there is any difference).

I will be immensely grateful to somebody who can help me in this .

laxmi_maha2000
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Posts: 8
Joined: Wed May 21, 2008 4:27 pm

Post by laxmi_maha2000 » Thu Jul 03, 2008 8:40 pm

This link will answer your questions:

http://www.csis.ul.ie/COBOL/Course/Intr ... Access.htm

Sequential files- ESDS
Relative files - RRDS
Indexed files - KSDS
Regards,
Lakshmi

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