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
VSAM ⭐ Featured
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Q: What is KEYRANGES?

Answer:
KEYRANGES distributes KSDS across volumes by key value. KEYRANGES((low1 high1) (low2 high2)). Each range on different volume. Improves parallel access. Rarely used now.
keyranges distribution volumes
VSAM ⭐ Featured
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Q: What is FREESPACE distribution?

Answer:
FREESPACE spread across CIs and CAs. Initial load distributes evenly. After activity, distribution varies. REORG restores even distribution. Monitor CI/CA splits for tuning.
freespace distribution splits
CICS ⭐ Featured
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Q: Explain CICS regions

Answer:
CICS region is address space. TOR (Terminal Owning) owns terminals. AOR (Application Owning) runs programs. FOR (File Owning) owns files. MRO connects regions. Workload distribution.
region tor aor