CICS/TS Internal Structure & Debug Systems

Course:  CDE
Duration:  3 Days
Level:  III
Course Summary

The course will provide a detailed explanation of the CICS Internal Structure and how to Debug both Application and System Dumps using IPCS. This includes dump reading workshops. Students are introduced to the "external symptoms" that may be evident when a system or transaction dump is created. CICS messages and codes, no response-waits and system recovery are discussed in detail.

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Topics Covered In This Course

INTRODUCTION

  • Students are introduced to the "external symptoms" that may be evident when a system or transaction dump is created. New CICS messages and codes, no response-waits and system recovery are discussed in detail. Types of dumps, using IPCS and the relevant CICS control blocks (DTAs/TXNs/SMXs/TCAs) are outlined. Transaction Definition changes - runaway vs ICVR, TRANCLASS vs TCLASS and CMXTLIM vs PURGETHRESH are explained.

RECURSIVE ABENDS

  • Task logical levels (PLCB's), ABEND exits and link control blocks are discussed in the context of recursive abends. The new layout of a dump is analyzed checking Program Status Word (PSW), program entry and load points and short symptom string. COBOL II compile listings are reviewed with emphasis on condensed listings, DSA, TGT, BLW, BLL, working storage and linkage. Methods for solving recursive ASRA's are investigated. Program definition autoinstall is discussed.

STORAGE VIOLATION

  • Storage Manager Domain (SM) functions are reviewed. Subpools, LSCZ,TSCZ, SAAs, STORAGE PROTECTION, Transaction Isolation, ERDSA, RDSA, Page Allocation Maps (PAM), Storage Element Descriptors, Free Storage Descriptors and EXECKEYs are described. Ways in which storage may be violated are investigated. Violations are solved and traced back to the source coding error. Storage acquisition by CICS modules is examined. Using the Storage Trap is discussed. New DSA management techniques (Extents/Page Segment Tables) are investigated.

DEADLY EMBRACES.

  • Resources and insuring integrity are discussed. Tasks in the system examined. The dispatcher domain (DS) summary is investigated and resource types and names explained. The use of Enqueues and possible problems are investigated. Resource management including VSAM Strings, Local Shared Resources (LSR), Control Intervals (CIs), and Logging is covered. Temporary Storage Domain is discussed. VSAM RLS and the shared vs exclusive locks are examined.

TRACES

  • The use of Traces and the Trace Domain (TR) are reviewed. Activating tracing through CETR and the types of tracing, for example Standard or Special, Component Tracing, Internal/Auxiliary or GTF traces, are examined. The four different trace styles are explained, i.e. Level Two Tracing is investigated with the new VERBEXIT keyword TRS.

DOMAINS

  • The Domain Architecture is discussed. The Kernel Domain Task Summary is explained. Evidence from the summary is tracked through to the Storage Manager Domain Summary. The Kernel Error Data Report is investigated. The Kernel Linkage Stack Entries are reviewed together with Kernel Domain and subroutine calls. The transaction manager and the dispatcher domain are examined in detail. OTE support for JVM and DB2 is discussed. The dump domain and dump table are discussed. Program Manager Domain, Loader Domain, Directory Domain, Enqueue Domain, Sockets and Web Domains, Document Domain, Temp Storage Domain and the roles played by Application Domain and Transaction Manager are reviewed.

RECOVERY MANAGER/LOG MANAGER

  • Management of tasks in a distributed environment through UOWs and RMCs. The new commands are discussed. RRM in the EXCI Environment and SYNCONRETURN are studied.

INITIALIZATION AND SHUTDOWN

  • The Initialization process is discussed. The PLTPI is reviewed. Types of Shut Down, including Initial, and the problems that may be encountered are discussed.

IPCS

  • Formatting SDUMPS using IPCS is discussed.
What You Can Expect
  • Describe the internal structure of CICS/TS, including the domain structure.
  • Provides the student with step-by-step procedures for solving a variety of CICSabends and failures.
  • CICS/TS failure situations are explained.
  • How failures are internally handled and how the user can participate in ABENDprocessing is discussed.
  • Control Blocks and internal logic for specific failures are presented.
  • Transaction dumps and system dumps are investigated.
  • Dump reading skills are honed.
  • Dumps and Workshops are provided.
  • IPCS is also taught so that students become familiar with this product.
  • Recovery Manager, RRMS and UOW's are explained together with DFHLOG and DFHSHUNT.
Who Should Take This Course

System Programmers and Technical Support Staff responsible for supporting a CICS

system. CICS Application Programmers who are responsible for reading their own CICS dumps.

Recommended Prerequisites

System Programmers and Technical Support Staff should have at least six months CICS experience. Application Programmers should have a minimum of nine months CICS programming experience.

Training Style

This class is taught by lecture and hands-on workshops. Dumps will be provided.

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Every student attending a Verhoef Training class will receive a certificate good for $100 toward their next public class taken within a year.

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Schedule For This Course
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