COBOL ⭐ Featured
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Q: Explain DEBUGGING declarative

Answer:
USE FOR DEBUGGING enables debug procedures. Requires WITH DEBUGGING MODE. Triggers on: ALTER, PERFORM, GO TO, or reference to debug item. Displays data values and flow. Object code excluded unless compiled with DEBUG option.
debugging declarative trace
COBOL ⭐ Featured
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Q: What is READY TRACE?

Answer:
READY TRACE turns on paragraph tracing. Shows paragraph names as executed. RESET TRACE turns off. Must compile with debugging option. Output goes to SYSOUT. Replaced by better debuggers but useful for quick flow analysis.
trace debugging flow
JCL ⭐ Featured
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Q: What causes S0C4 in batch?

Answer:
S0C4 is protection exception - addressing unallocated memory. Causes: uninitialized pointer, subscript out of range, incorrect LINKAGE SECTION. Check CEEDUMP for offset. Likely program bug. Use debugger to trace.
s0c4 protection abend
CICS ⭐ Featured
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Q: Explain CICS troubleshooting

Answer:
CEDF for debugging. CEMT for status. Dumps for abends. Trace for flow. CICS messages. Aux trace for detailed analysis. Systematic approach.
troubleshoot debug trace
DB2
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Q: How to monitor DB2 performance?

Answer:
Use OMEGAMON, DB2PM, or built-in monitor. Check: buffer pool hit ratios, lock waits, CPU time, elapsed time. DISPLAY commands show real-time. Statistics trace for analysis. EXPLAIN for query level.
monitoring performance statistics