Front cover CICS Transaction Server from Start to Finish CICS Transaction Server introduction and history CICS Transaction server facilities, interfaces, and data CICS Explorer and the CICS Tools Chris Rayns Amy Ferrell Sarah Bertram Gordon Keehn George Bogner Peter Klein Chris Carlin Ronald Lee Andre Clark Erhard Woerner ibm.com/redbooks International Technical Support Organization CICS Transaction Server from Start to Finish December 2011 SG24-7952-00 Note: Before using this information and the product it supports, read the information in “Notices” on page xi. First Edition (December 2011) This edition applies to Version 4, Release 2, CICS Transaction Server. © Copyright International Business Machines Corporation 2011. All rights reserved. Note to U.S. Government Users Restricted Rights -- Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp. Contents Notices . xi Trademarks . xii Preface . xiii The team who wrote this book . xiv Now you can become a published author, too! . xvi Comments welcome. xvii Stay connected to IBM Redbooks . xvii Part 1. CICS introduction and history . 1 Chapter 1. Introducing CICS. 3 1.1 What is CICS. 4 1.2 Transaction processing . 5 1.2.1 Why CICS . 5 1.3 CICS applications . 7 1.4 Access to external data . 8 1.5 CICS topology . 9 1.6 CICS configuration interfaces . 10 1.6.1 System initialization parameters . 10 1.7 Security and CICS. 12 1.8 Systems management programming interfaces . 13 1.8.1 The CICS management client interface . 13 1.8.2 The CICSPlex SM application programming interface . 13 1.8.3 The CICS system programming interface . 14 1.9 The evolution of CICS . 14 1.9.1 The birth of CICS . 15 1.9.2 1970 to 1979 . 16 1.9.3 1980 to 1989 . 17 1.9.4 1990 to 1999 . 18 1.9.5 2000 to 2011 . 19 1.10 CICS today . 22 1.10.1 What is new. 22 1.10.2 CICS and world commerce . 23 1.11 The future of CICS . 25 1.12 Example organizations . 27 1.12.1 Bank . 27 1.12.2 Catalog sales store . 28 © Copyright IBM Corp. 2011. All rights reserved. iii Part 2. CICS fundamentals . 29 Chapter 2. CICS facilities . 31 2.1 System Initialization. 32 2.1.1 CICS Initialization Process . 32 2.1.2 CICS address space initialization . 32 2.1.3 Start Auto . 34 2.1.4 Start Initial . 34 2.1.5 START Cold . 35 2.1.6 CICS System Initialization Parameters . 35 2.1.7 Why we need system initialization parameters . 36 2.1.8 System initialization Table. 37 2.1.9 Program Load Table . 38 2.1.10 Why you use initialization and termination programs . 38 2.2 Defining my resources to CICS . 40 2.2.1 Resource definition options. 41 2.2.2 Where are my resource definitions are held . 45 2.2.3 Organization of resource definitions . 46 2.2.4 Getting started with CEDA . 46 2.3 CICS DB2 Attachment Facility . 49 2.3.1 Why we use the CICS DB2 Attachment Facility . 49 2.3.2 Design of the CICS DB2 attachment Facility . 50 2.3.3 Threads . 50 2.3.4 Why we use pool and entry threads . 51 2.3.5 Managing the CICS DB2 attachment facility . 53 2.3.6 Why you manage the CICS DB2 Attachment . 53 2.4 CICS and WebSphere MQ . 54 2.4.1 Interfacing WebSphere MQ with CICS . 55 2.4.2 CICS WebSphere MQ Adapter . 56 2.4.3 The trigger monitor CKTI. 58 2.4.4 CICS WebShere MQ Bridge . 60 2.5 CICS logging and journaling . 64 2.5.1 The need for logging and journaling for CICS. 65 2.5.2 CICS MVS logging and journaling. 66 2.5.3 MVS logger design . 68 2.5.4 DASD only log streams . 68 2.5.5 Coupling Facility log streams . 69 2.5.6 CICS implementation of the z/OS logger . 69 2.5.7 CICS Log tail trimming process. 70 2.6 CICS exits . 73 2.6.1 Global User exits. 73 2.6.2 Task-related user exits . 74 2.7 CICS security . 76 iv CICS Transaction Server from Start to Finish 2.7.1 CICS Security concepts using RACF . 78 2.7.2 Passwords and pass phrases . 79 2.7.3 CICS and identity propagation: The end-to-end Security solution . 79 2.8 Monitoring the CICS System . 82 2.8.1 CICS monitoring . 82 2.8.2 Monitoring CICS transactions . 83 2.8.3 CICS SMF records 110 . 84 2.8.4 Managing performance records . 85 2.8.5 The importance of collecting CICS statistics. 88 2.8.6 Interval statistics . 88 2.8.7 End of day statistics . ..