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TIP # CICS
Use CALLs instead of LINKs in CICS
EXEC CICS LINK
– establishes a new run unit
– sets up environment
– Does CICS table-search
– For all this activities, it executes 1400 machine code instructions
CALL
– It executes around 12 machine code instructions
Just replacing EXEC CICS LINK with CALL statement on a case study, it was found that
Internal Transaction Response time improved 23 – 78 %
Total CPU Time improved 15 – 23 %
Dynamic storage use improved 11 – 30 %
* CALL used in the study is STATIC CALL . COBOL refered here is VS COBOL II

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TIP # CICS
You can use a COBOL CALL statement to call only a VS COBOL II or an Assembler language
program in the same load module as the calling program.
For calls to programs written in languages other than VS COBOL II, including other versions of
COBOL, you need to use the commands EXEC CICS LINK or EXEC CICS XCTL.

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TIP # CICS

Do you know how CICS was called initially ??
PUCICS!!!
PUCICS stands for Public Utilities Customer Information Control System.
After couple of years, it took the name CICS.

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TIP # CICS

What is the difference between getting the system time with EIBTIME and ASKTIME
command?
ASKTIME = requests the current date and time
EIBTIME = field have the value at the task initiation time

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TIP # CICS

To access the system values like date, time, Userid etc and store in a variable, one can use
EXEC CICS ASSIGN

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TIP # CICS

While doing a mass delete using a generic key, how can you determine the number of records
deleted?
By using the NUMREC(data-area) option with the generic key. Upon completion of the delete
the data-area will contain the number of records that are deleted.

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TIP # CICS

When generating Mapset, specify TIOAPX=YES for COBOL programs. YES generates a 12-
byte FILLER item at the beginning of each symbolic map. It should always be specified for
COBOL programs.


Important SQL CODES and ABEND CODES
SORT JOIN – TO JOIN TWO FILES BASED ON A KEY
KNOW YOUR MAINFRAME
REXX – INITIAL SETUP
HOW TO SUBMIT A BATCH JOB FROM THE CICS PROGRAM
CICS – EXEC interface block – EIBRESP Values
CICS – EXEC interface block Fields
Flow of control between COBOL programs, run units, and CICS
CICS INTERVIEW QUESTIONS
CICS TIPS
COBOL – COPY and INCLUDE statements
COBOL – PERFORMANCE IMPROVEMENT
COBOL – SIGN STORED IN COMP, COMP-3 AND DISPLAY FORMATS
SHORTEST COBOL PROGRAM
RESTART LOGIC IN COBOL DB2 Program
GOBACK – EXIT PROGRAM – STOP RUN
Continuation lines in COBOL
Computational items – COMP, COMP 1 , COMP 2, COMP 3
COBOL program format
cobol indicator area column-7 and area a and area b
COBOL INTERVIEW QUESTIONS
COBOL TIPS
COBOL COMPILER OPTIONS
The IDENTIFICATION DIVISION
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