VSAM ⭐ Featured
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Q: Explain FREESPACE parameter

Answer:
FREESPACE(cipct capct). CI percent free for inserts. CA percent free for splits. FREESPACE(20 10) leaves 20% CI, 10% CA free. More freespace reduces splits but uses more space. Tune based on activity.
freespace space tuning
CICS ⭐ Featured
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Q: Explain PCT

Answer:
PCT (Program Control Table) defines transactions. Now RDO TRANSACTION. Links TRANSID to initial program. Security, priority, other options. CEDA DEFINE TRANSACTION.
pct transaction table