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Sub-systems in DB2 and IMS

 
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rskumar

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Joined: 21 Nov 2005
Posts: 35
Location: chennai

PostPosted: Wed Mar 22, 2006 11:09 am    Post subject: Sub-systems in DB2 and IMS
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Hi all,

I am a beginner in database usage in mainframes.

currently i entered the IMS field and often i found a term called "sub-

system". can anyone tell me what is a subsystem and its significance?
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ARJUN

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Joined: 16 Nov 2004
Posts: 18
Location: Chennai

PostPosted: Wed Mar 22, 2006 3:18 pm    Post subject: Subsystem
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Dear Saravana Kumar,

A Subsystem is like service provider which performs one or more functions until unless you requested. The following are IBM supplied subsystems

1) JES2
2) JES3
3) NETVIEW
4) IMS
5) OPC

And there are two types of subsystems namely PRIMARY, SECONDARY subsystems and MVS communicates this using
SSI(Subsystem Interface). Its act only as a mechanism for transforing control and data between a requestor and subsystem. SSI is a way for one routine to call another routine like a BALR, LINK,SVC,PC(program call)
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