COBOL ⭐ Featured
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Q: What is a copybook and why is it used?

Answer:

A copybook is a reusable code file that can be included in multiple programs using the COPY statement.

Uses:

  • Standard record layouts
  • Common working storage definitions
  • Reusable paragraphs
  • Ensures consistency across programs

Syntax:

COPY EMPREC.
COPY EMPREC REPLACING ==EMP== BY ==WS-EMP==.

Benefits:

  • Reduces code duplication
  • Easier maintenance
  • Standard definitions across team
fresher interview
VSAM ⭐ Featured
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Q: How to reorganize VSAM?

Answer:
REPRO out then back: REPRO to sequential, DELETE cluster, DEFINE new cluster, REPRO back. Alternatively, IDCAMS export/import. Reclaims space, restores free space distribution. Schedule regularly.
reorg reorganize maintenance
COBOL ⭐ Featured
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Q: What is ALTER statement?

Answer:
ALTER changes GO TO target dynamically. ALTER para-1 TO PROCEED TO para-2. Obsolete-causes maintenance nightmares. Makes flow unpredictable. Use EVALUATE or SET/IF instead. Some shops prohibit. Still legal but strongly discouraged.
alter goto obsolete
VSAM ⭐ Featured
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Q: Explain UPGRADE path AIX?

Answer:
UPGRADE AIX maintained automatically on base cluster changes. PATH allows access but not update. PATH with UPDATE allows updates via alternate key. UPGRADE adds overhead but keeps AIX current.
upgrade path maintenance
DB2 ⭐ Featured
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Q: How does REORG work?

Answer:
REORG physically reorganizes tablespace or index. Eliminates fragmentation, reclaims space, restores clustering. REORG TABLESPACE db.ts. Options: SHRLEVEL (REFERENCE/CHANGE), LOG (YES/NO). Schedule during low activity. Run RUNSTATS after.
reorg performance maintenance