c ics overview

7/28/2019 c Ics Overview

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IBMs CustomerIBMs CustomerInformation ControlInformation Control

System, CICSSystem, CICS

Art Hendela, President

Hendela System Consultants, Inc.

Little Falls, NJ

1-973-890-0324WWW.HENDELA.COM

[email protected]

Your Web Database Experts
http://www.hendela.com/index.aspxmailto:[email protected]:[email protected]://www.hendela.com/index.aspx


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What is a Transaction?What is a Transaction?

A transaction has four properties: It isAtomic, Consistent, Isolated, &Durable.

Atomic - A unit of work that succeeds orfails.

Consistent - System restored to a

constant state after completion. Isolated - one transaction does not

impact another, even if done at thesame time.

Durable - A committed transaction ishttp://www.hendela.com Your Web Database Experts. Landing pages, Online Surveys, Search Engine Optimization
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CICS HistoryCICS History

1968 - Package developed by Michigan Belland IBM on OS/360

1971 - CICS available for DOS & DOSE

1973 - Development moved to Hursley,England

1987 - CICS/VM introduced

1992 - CICS/400 version for AS/400 1996 - CICS Web Interface Product

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CICS Hardware &CICS Hardware &

Operating SystemsOperating Systems IBM zSeries 900 - z/OS

IBM S/390 - OS/390, MVS, VSE

IBM AS/400 - OS/400 IBM RS/6000 - AIX (Unix)

PC Server - Windows NT/2000, OS/2

The most popular is the S/390 usingOS/390 or MVS



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CICS ProgrammingCICS Programming

LanguagesLanguages Assembler

COBOL

PL/I

Rexx

C/C++JAVA



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CICS OrganizationCICS Organization

CICS Management Services

Data Management Services

Application Programming Interface

Basic Mapping Support

Terminal Control Services



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CICS Service DiagramCICS Service Diagram

Terminal

Control

(VTAM,SNA,TCP/IP)

Basic

Mapping

Support

Terminal User

Application

ProgrammingInterface

Application

Program

Maps

File Control

SQL

DL/I

VSAM

DB2

IMS

OS/390CICS

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CICS ProgramCICS Program

InvocationInvocationUser Enters

TRANS-ID

CICS finds

TRANS-ID in PCT

to get program name

CICS finds

program name

in PPT

CICS loads program

into memory/

starts program

CICS runs program

in address space

TRANS-ID = Transaction Identifier

PCT = Program Control Table

PPT= Processing Program Table



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CICS Example - ScreenCICS Example - Screen

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44



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SummarySummary

CICS grew from the need to handle interactivetransactions

CICS operates on many different IBMcompatible hardware platforms using a varietyof languages.

CICS uses Service programs to controlexecution and use of system resources.

A CICS user sends a TRANS-ID to begin theprogram execution.



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GlossaryGlossary[Ankrum][Ankrum] ACID - Atomic, Consistent, Isolated, Durable: transaction properties. BMS - Basic Mapping Support: For definition and access to formatted screens.

CICS - Customer Information Control System.

CMS - Conversational Monitor System: An interactive subsystem for VM.

DB2 - Database 2, IBMs relational database manager.

DL/I - Data Language / I: General purpose database control language.

DOS - Disk Operating System: An early IBM operating system for small mainframes or the

original operating system for IBM compatible PCs. IMS - Information Management System: IBM Product with an OLTP and hierarchical database

manager.

MVS - Multiple Virtual Storage: Top of the line IBM operating system before OS/390.

OLTP - On-line Transaction Processing.

OS/390 - Open System 390: latest operating system for IBM System/390s.

SNA - System Network Architecture: IBMs proprietary network protocol.

SQL - Structured Query Language: interface to access relational databases.

TCP/IP - Transmission Control Protocol/Internet Protocol.

VM - Virtual Machine: IBM Mainframe operating system to allow multiple operating systems torun on one machine simultaneously.

VSAM - Virtual Storage Access Method.

VTAM - Virtual Telecommunications Access Method.

Additioanl definitions may be found at:http://www.transarc.ibm.com/Library/documentation/websphere/WAS-EE/en_US/html/glossary/cicsglos.htm



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ReferencesReferences

Antrim, T. Scott, The Evolution of CICS 30 Years Old and Still Modern.www.cobolreport.com/columnists/tscott/part1.html - part4.html, May,2001.

Comaford, Christine, Managing Transactions is a Serious Business.

PC Week, March 20, 1995 12(11), pg 19(1). Donofrio, Phyllis. CICS-A Programmers Reference, McGraw-Hill,

1991.

Horswill, John & Hursley CICS Development Team, Designing &Programming CICS Applications, OReilly, 2000.

Hudders, Eugene S. CICS-A guide to Internal Structure, John Wiley &

Sons, 1994. IBM, CICS, http://www-4.ibm.com/software/ts/cics/, 2001.

Lowe, Doug, The CICS Programmers Desk Reference, Mike Murach& Associates, 2nd Ed, 1992.

Menendez, Raul & Doug Lowe. Murachs CICS for the COBOLProgrammer, Mike Murach & Associates, 2001.

Nusphere Tech Notes, ACID Transactionswww nusphere com/products/library/acid transactions htmhttp://www.hendela.com Your Web Database Experts. Landing pages, Online Surveys, Search Engine Optimization

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