CICS/TS Architecture Part 1 - Foundations

Objectives
On successful completion of this course, attendees will be able to:

• describe the domain architecture of CICS/TS
• explain the dispatching of work on multiple TCBs including L8, J8, SO, SL and QR
• describe how work gets into CICS by a variety of means
• explain how the Loader and Program Manager domains work
• debug CICS system and transaction problems
• discuss IPCS and the CICS verbexit
• tune CICS/TS
• describe the CICS-DB2 interface
• describe the exploitation of Threadsafe programs.

Who Should Attend
CICS Systems Programmers and CICS Administrators.
Prerequisites
Experience of the externals of CICS, such as application and/or systems programming and/or resource definition and administration is preferred. Prior CICS Internals knowledge is not required.
Duration
5 days

Course Code
TSAR1
Contents
Domain Architecture
The Domain structure of CICS/TS, how domains are initialised/terminated and how they collaborate with each other.


Kernel Domain
Tasentries; KE Stack storage; Domain Gate Table; KE PUSH/POP; Runaway; Kernel Linkage and Kernel Error management.


Dispatcher Domain
Default Task; Suspend/Resume; Post Exit mechanism; Dispatchable chains; Hand Post mechanism; ICV; PRTYAGE mechanism; DTAs and DSTCBs; practical session.


Transaction Manager Domain
Attach/detach processing; maximum tasks (MXT) and Tranclass processing; control blocks: XM anchor XMTxn.


Application Domain
CSA and OPFL; System and User Task Control Areas; the EXEC Interface block; finding the high level language save area for non-LE programs; using the LE dynamic save area and common anchor block for LE conforming programs.


Enqueue Domain
ENQMODELS enhancements to CICS for local and system wide locking. How to identify ENQ problems using dumps and on-line techniques. ENQ pools and NQEA control blocks.


File Control
Elimination of exclusive control deadlocks and impact on performance incl. CILOCK=NO/YES; changes to local/remote test for function shipping; changes to user exits; use of Coupling facility data tables; RLS and non-RLS files; Record Level Sharing without a CF; practical session.


Loader Domain
Programs; Mapsets; Loader Functionality; Program Status; Control blocks: LD anchor, APEs, and CPEs and RPS.


Program Manager Domain
Program Logical levels and environment save areas; load list elements; control blocks: PPTEs, PLCBs, PESAs. COMMAREA limit circumvention via Channels & Containers, example of use, channel scope and internal blocks.


Language Environment
Using CEECOPT, CEEROPT and the CLER transaction to manage storage and debugging options; using LE process, enclave and thread blocks to debug applications; using the LE traceback report; understanding SIT parameters AUTODST and RUWAPOOL.


Debugging Transaction Dumps
ASRAs; AICAs; Dynamic call and Program LINKs; Practical.


CICS/DB2 Interface
Using the DB2 control blocks to find SQL statements and solve problems; control blocks: D2GLB, D2CSB, D2LOT, D2ENT and D2TRN.