VSAM ⭐ Featured
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Q: Explain MASSINSERT?

Answer:
MASSINSERT optimizes bulk sequential inserts. System defers CI splits. Better performance for loads. Implicit with REPRO. COBOL can hint with APPLY WRITE-ONLY style.
massinsert bulk load
COBOL
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Q: What is APPLY WRITE-ONLY?

Answer:
APPLY WRITE-ONLY FOR file-name optimizes output buffer handling. System doesn't preserve record area after WRITE. Can't re-read just-written record. Improves I/O performance. Use when write-only access pattern is guaranteed.
apply write-only performance