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Q: What is COND CODE?
Answer:
Programs return condition/return code in register 15. COND parameter tests: COND=(4,LT) skips if 4 < any prior return code. Values 0-4095. Convention: 0=success, 4=warning, 8=error, 12+=severe. Used for job flow control.
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Q: Explain NULLFILE keyword?
Answer:
NULLFILE is alternate for DUMMY. //DD DD NULLFILE. Discards output, provides EOF for input. DSN=NULLFILE equivalent. No actual dataset. Useful for testing without actual files.
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Q: What is TYPRUN parameter?
Answer:
TYPRUN options: SCAN (syntax check, no execution), HOLD (submit but hold), COPY (copy JCL to SYSOUT), JCLHOLD (hold with JCL). TYPRUN=SCAN validates JCL without running. Useful for testing complex JCL before production.
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Q: Explain DD DUMMY statement
Answer:
DD DUMMY discards output/provides EOF for input. No I/O actually performed. DUMMY, DSN=NULLFILE equivalent. Use to skip optional outputs or provide empty input. Program sees immediate EOF on read. Writes succeed but discarded.
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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.
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Q: What is SPUFI?
Answer:
SPUFI (SQL Processing Using File Input) is TSO tool for interactive SQL. Input dataset with SQL statements. Output shows results. Good for testing queries, DDL, quick data checks. Not for production processing.