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Q: How does INSPECT work?
Answer:
INSPECT examines/modifies string contents. INSPECT field TALLYING counter FOR ALL 'X'. INSPECT field REPLACING ALL 'A' BY 'B'. INSPECT field CONVERTING 'abc' TO '123'. Useful for data validation, transformation, and counting characters.
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Q: What causes JCL ERROR?
Answer:
JCL ERROR means syntax error or invalid combination. Check: missing commas, unmatched quotes/parentheses, misspelled keywords, invalid parameter values. JES message indicates line and error. JESYSMSG has details.
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Q: Explain DB2 triggers
Answer:
Trigger fires automatically on INSERT/UPDATE/DELETE. CREATE TRIGGER name AFTER/BEFORE/INSTEAD OF event ON table FOR EACH ROW/STATEMENT. Use for audit, validation, derived columns. Can impact performance.
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Q: What is CLASS condition?
Answer:
CLASS tests character content. IF field IS NUMERIC/ALPHABETIC/ALPHABETIC-LOWER/ALPHABETIC-UPPER. Custom classes in SPECIAL-NAMES: CLASS VOWELS IS 'A' 'E' 'I' 'O' 'U'. Then IF char IS VOWELS. Useful for validation.
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Q: How to use JCLTEST?
Answer:
TYPRUN=JCLTEST validates JCL without execution. Checks syntax, dataset names, authorization. Some systems support TYPRUN=SCAN which is similar. Submit job and check messages. No resources actually allocated.