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Debug Tool for z/OS
| Duration: 2 days |
| Participants: Application developers, mainframe support staff, and systems programmers. |
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Objectives:
Upon successful completion of this course you will be able to effectively use the Debug Tool to track and resolve problems in the following situations:
- Batch COBOL abend. - Batch COBOL loop. - Batch COBOL logic error. - CICS COBOL transaction. - CICS COBOL STARTed task. - Batch COBOL DB2 error. - Triggered CICS task, from MQ. - DB2 Stored Procedures. |
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Overview:
- Debug Tool is similar to other debuggers, such as Xpediter, Fault Analyzer. - You will learn to use the new version of z/OS Debug Tool to debug a wide variety of typical abends in COBOL programs running on a Z/OS mainframe system. - This course teaches the wide range of commands available in the Debug Tool, including the new commands, and shows you how to effectively debug batch COBOL programs, CICS COBOL programs, and DB2 COBOL programs. - You will learn to debug a variety of actual abends and program failures in this extensively hands-on course. |
| Prerequisites: Knowledge of COBOL programming. For DB2 and CICS debugging, also require knowledge of DB2 and CICS programming |
| Setup: Site must have TSO logons with Debug Tool properly configured. Each student needs a PC or terminal with mainframe access. |
| Format: Lecture and discussion with extensive hands-on exercises. |
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Topic Outline:
- Introduction What is the debugger Ways of using the debugger: batch, interactive, remote - Getting Ready to Use the Debug Tool Compile options needed Source file storage Overview of Debug Commands: Format and sampling Debug Command Files How to start the Debugger – TEST runtime option How to Stop the Debugger – QUIT vs. QQUIT Full screen display layout Debugging on two user sessions - Debugging Batch COBOL Programs Basic operations in the Full screen session panel General usage notes: scrolling, PFkeys, Find, etc. Using Debug Commands Source File Selection Running, stopping and controlling execution flow in the program Executing your program with run, step, and animation Positioning at error causing location: GO, LIST %LINE Breakpoints AT command usage TRIGGER ENABLE/DISABLE Monitoring and manipulating variables LIST variable MONITOR window SET variable Special features just for COBOL LIST options to show CALLS, etc. MOVE command Source changes Writing debugging scripts General purpose scripts for reuse Conditional command processing: EVALUATE, IF, PERFORM Specialized scripts Using the customized debugging scripts at your site New features in Debug Tool Saving settings, breakpoints and monitors, with QUERY SAVE, QUERY RESTORE, RESTORE, SET SAVE, SET RESTORE New JUMPTO command Enhanced commands including AT ENTRY, FIND, LOAD, etc. - Debugging CICS and WS MQ programs CICS environment setup considerations System requirements Saving Preferences in CICS pseudo-conversational programming environments Debug modes for CICS Starting and stopping debug in CICS Special considerations while processing through CICS applications MQSeries triggers - Debugging DB2 programs and Stored Procedures System and setup requirements Using the Debug Tool Setup Utility Starting and stopping Debug Tool for DB2 programs Accessing DB2 return codes and message code variables |
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