Mainframe - Introdução CICS, Notas de estudo de Análise de Sistemas de Engenharia

Baixe Mainframe - Introdução CICS e outras Notas de estudo em PDF para Análise de Sistemas de Engenharia, somente na Docsity!

Customer Information Control System

• (^) Course Type: Facilitated
• (^) Course Notes:
  • (^) Notes are located in the Notes View. (Please see View Master/Notes Master to see the Notes View.)
• (^) This course is best viewed in Slide Show Mode. You can download this course to your desktop (if desired) for printing and note taking.
• (^) Length of Course: 40 hours.
• (^) Course Audience: Team Members or Project Managers with exposure to Mainframe Technology

Course Mechanics Course Mechanics

• (^) Participants will be able to learn and work on CICS Application Programming

Course Objectives Course Objectives

Agenda Agenda

NOTE - Click on arrow to directly advance to the topic Introduction to CICS Program Preparation Program Control Basic Mapping Support Error & Exception Handling File Handling Queues Interval and Task Control Communication with Databases Recovery and restart

• (^) CICS is a growing multi-billion dollar business for customers, IBM and the thousands of software companies which support CICS
• (^) CICS handles more than thirty billion transactions per day
• (^) Each day CICS processes more than $1 trillion in transactions
• (^) More than thirty million people use CICS
• (^) CICS can support over nine hundred thousand concurrent users

What’s special about CICS

• (^) CICS allows any enterprise to adopt e-business whilst minimizing the exposure to the potential risks of new technology, by use of an evolutionary approach
• (^) CICS allows you to take existing applications to the web with little or no change
• (^) CICS supports numerous application development environments and models including COBOL, PL/I, Java, EJB and Object Oriented (OO), in any combination

What’s special about CICS (cont…)

• (^) Customer Information Control System - CICS developed in late 1960s as a DB/DC control system
• (^) CICS provides an interface between the Operating System and application programs
• (^) Macro Level CICS - initial version Assembler macro to request CICS services
• (^) Command Level CICS - high level language version - commands to request CICS services - Single command can replace series of macros

CICS

CICS & Operating System Operating System CICS User’s App.Prg Files & Database Enter Code :

• (^) Data-Communication Functions
• (^) Data-Handling Functions
• (^) Application Program Services
• (^) System Services
• (^) Monitoring Functions

CICS System Services

• (^) Pseudo-Conversational
• (^) Multitasking
• (^) Multithreading
• (^) Quasi-Reentrancy

Application Programming Concepts

Conversational A mode of dialogue between program and terminal based on a combination of sending message and receiving message within the same task

• (^) Since human response is slower than the CPU speed, a significant amount of resource will be wasted just waiting Pseudo-Conversational A mode of dialogue between program and terminal which appears to the operator as a continuous conversation but which is actually carried by a series of tasks

Terminal Conversation

PROCEDURE DIVISION. : FIRST-PROCESS. EXEC CICS RECEIVE ---- <= TSK1, END-EXEC. : process EXEC CICS SEND ----- <= EMP(12345) Details END-EXEC.

• • • • • • • Program Waits For Response - - - - - SECOND PROCESS. EXEC CICS RECEIVE ----- <= User Enters Data END-EXEC. : process

Conversational Transaction - Example

• (^) Management Modules
  • (^) Programs that interface between OS and app. pgm
  • (^) Handle the general functions that are crucial to operation of CICS
• (^) Control Tables
  • (^) Define the CICS environment
  • (^) Functionally associated with the management module
• (^) Control Blocks
  • (^) Contain system type information. Eg. Task Control Area contains info. about the task

CICS Components

• (^) Programs Program Control PCP File Control FCP Terminal Control TCP Storage Control SCP Task Control KCP Temporary Storage TSP Transient Data TDP Interval Control ICP Journal Control JCP
  • (^) Tables Processing Pgm PPT File Control FCT Terminal Control TCT Program Control PCT Temp. Storage TST Destin. Control DCT Resource Control RCT

Management Programs & Control Tables