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Q: Explain database design normalization
Answer:
1NF: atomic values, no repeating groups. 2NF: 1NF + no partial dependencies. 3NF: 2NF + no transitive dependencies. BCNF: stricter 3NF. Higher forms reduce redundancy. Denormalize for performance. Balance is key.
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Q: What is MOVE CORRESPONDING?
Answer:
MOVE CORRESPONDING moves all fields with matching names between groups. MOVE CORR INPUT-REC TO OUTPUT-REC. Only moves if names match exactly. Moves all matches, not just first. Useful for record transformations. Debug carefully-silent partial moves.
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Q: What is EXEC CICS READ?
Answer:
READ retrieves VSAM record. EXEC CICS READ FILE(name) INTO(area) RIDFLD(key) LENGTH(len). Optionally: UPDATE for update intent, KEYLENGTH for partial key. Generic key with GENERIC/KEYLENGTH. Returns NOTFND if missing.
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Q: What is KEYLENGTH option?
Answer:
KEYLENGTH specifies key portion for generic access. EXEC CICS READ FILE RIDFLD(partial) KEYLENGTH(4) GENERIC. Finds first matching prefix. Use with GTEQ for range.