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What is CICS
Customer Information Control System ( CICS ) is introduced by IBM in 1960s
to support online programming on Mainframes. CICS acts like a sub-operating
system, it manages its own memory space, control the concurrent execution of
multiple applications. CICS is it self is a batch job running on Mainframe to
enable application programes to respond to online requests. You can see the
CICS job running on mainframe, by checking in the spool.System operators daily
run this CICS job. We can observe multiple instances of CICS jobs are running
on mainframe. We call each CICS instance as CICS region.
As depicted in above picture, CICS is a high priority batch job running on
mainframe Operating System (OS) along with other batch jobs. CICS acts as a
interface between OS and Online Application programs. Online programs get
triggered by the user by entering a peace of data on terminals. Online
programs need to be designed in such way that these programs respond to user
instantly with required data.
To learn CICS Basics click here
Other Mainframe Basics
What is Mainframe?
What is COBOL ?
What is CICS ?
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