Difference b/w IMS and DB2

muthukumarapandian · Posted: Thu Feb 24, 2005 7:43 pm

Hai,

What is the difference b/w IMS and DB2 as a biginner what should i do to learn IMS.

sudhakar227 · New User Joined: 24 Feb 2005 Posts: 1

Hi,
IMS - Hirerchical Database Use DL/I calls
DB2 - Relational Datsbase Use EXEC SQL stmts

In Steve Elklosin what given is

Suppose in COBOL u declared One Group item 10 times using OCCURS clause. For this already space is allocated even before the records are stored. In IMS these are stored as OCCURENCES.
And also the Parent-Child relationship can differ with DB2.

NILESHK2302 · New User Joined: 13 Feb 2004 Posts: 14 Location: hyd

Please read the book

IMS for the COBOL programmer part 1 by Steve Eckols

sudheer648 · New User Joined: 23 May 2005 Posts: 97 Location: Chennai

Hi,

Get Yourself Comfortable about the Basics of IMS

1.SSA(QUA/Unqualified)
2.Qua/Unqualified Calls
3.PCB
4.PSB
5.Modes in which IMS runs
6.Difference between these Modes and how to write Jcls for those.
7.Different Function codes for different calls available in IMS
8.Restart Logic of IMS
9.CheckPoint Mechanism