This course introduces, explains and examines common z/OS COBOL abends, dump debugging and problem solving. Practical exercises based on example situations are integrated at stages throughout the course.
Prerequisites
COBOL programming experience as well as skills with TSO/ISPF and JCL.
COBOL programming experience as well as skills with TSO/ISPF and JCL.
Experienced COBOL programmers.
On successful completion of this course you will be able to:
- examine and analyse COBOL dumps
- debug COBOL programs
- describe the tools available and their use.
Introduction
- Getting it right: Specification, Design, Writing, Reviews
- Inspection Checklist: Data Errors, Calculation errors, Control-Flow errors, Interface errors, Input/Output errors, Compilation errors, Desk checking.
Using DISPLAY
- Using DISPLAY to trace the logic flow of the program.
FILLERs
Examples of Errors
- Initialisation errors
- Calculation errors
- Control-Flow Errors
- Interface errors: Calling Program, Called Program
- Interface errors
- Input/Output errors
Compiler Options
JESMSGLG & JESYSMSG ABEND Messages
- Interpreting messages
- Popular QSAM Abends: Code 35, Code 39 , Code 46.
ABEND Codes
Checking Codes Inside the Program
- Checking File Status Word
- Using Declaratives.
SYSUDUMP
- SYSDUMP
- Finding the instruction that caused the abend
- 1 - no called programs involved
- 2 - called programs.
SYSOUT
- No Call; Sysout Output
- Compiled Listing
- Called Program
- Sysout Output
- SYSOUT and TEST(SYM).
CEEDUMP
- No Call
- CEEDUMP; Compiled Listing
- Called Program
- CEEDUMP - Page 1
- CEEDUMP and TEST(SYM).
ABEND-AID
- Example
- COMPILED LISTING (using LIST)
- COBOL Source
- Example 2
- COMPILED LISTING
- Example 3.
Compiled Listing
- Using Compiled Listing: Compiled listing can be used to check the size of 01 group items, Using Compiled Listing to determine level of conditions.