Different between VSAM ESDS file to COBOL sequential file

raman.k · New User Joined: 26 Feb 2007 Posts: 24 Location: chennai

Any body know
What is the different between vsam esds file to cobol sequential file

dick scherrer · Posted: Tue Mar 27, 2007 10:27 pm

Hello,

There is nothing named a "COBOL sequential file". There is a type of file that is Physical Sequential (PS).

ESDS uses vsam definition and i/o. PS files are defined (typically via JCL) as they are created and are accessed via qsam.

Please post more detail if you would like additional info.

expat · Posted: Wed Mar 28, 2007 12:40 pm

ESDS is the VSAM equivilent of a PS file.

The original idea was to replace PS by ESDS which supposedly had faster I/O but with these days of RAID, Cache, NVS etc. etc. the DASD perform much much faster than they ever did before.

Additional functionality of ESDS is that it can be overlayed by an AIX.

raman.k · New User Joined: 26 Feb 2007 Posts: 24 Location: chennai

Thanks for all