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Q: What is identity column?
Answer:
Identity column auto-generates values. col INTEGER GENERATED ALWAYS AS IDENTITY. Or GENERATED BY DEFAULT (allows override). Start, increment configurable. Alternative to sequence for single-table keys.
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Q: Explain sequence objects
Answer:
SEQUENCE generates unique numbers. CREATE SEQUENCE name START WITH 1 INCREMENT BY 1. NEXT VALUE FOR sequence-name gets next. Used for keys. Cached for performance. No gaps guaranteed.
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Q: How to handle CICS security?
Answer:
RACF/ACF2 integration. EXEC CICS QUERY SECURITY. SIGNON establishes identity. VERIFY checks resource access. XFCT/XPPT exits. Secure by default.