4086. Replication & HA: delayed-replica verification — Reduce cost/latency while preserving semantics. — healthcare — Python + FastAPI + SQLAlchemy

DBMS Published 30 Sept 2026 Updated 30 Sept 2026 0 Views Verified

Scenario: A healthcare application must handle delayed-replica verification. Reduce cost/latency while preserving semantics. Explain the invariant, SQL strategy, transaction/locking behavior, failure handling, observability and test plan. Use MySQL 8-oriented syntax where applicable.

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Answer & Explanation

4 Answers

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Option 1: Disable database protections and repair inconsistent rows manually after delayed

Disable database protections and repair inconsistent rows manually after delayed-replica verification runs.

Additional Explanation

Correctness depends on explicit invariants, safe SQL, transaction/concurrency handling and verification.

Verified

Option 2: Run delayed-replica verification without defining transaction boundaries, retry

Run delayed-replica verification without defining transaction boundaries, retry behavior, or production validation.

Additional Explanation

Correctness depends on explicit invariants, safe SQL, transaction/concurrency handling and verification.

Verified Correct Answer

Option 3: Use a parameterized, transaction-aware MySQL 8 implementation for delayed-replic

Use a parameterized, transaction-aware MySQL 8 implementation for delayed-replica verification, validate the invariant, and explicitly test concurrency, retries and recovery.

Additional Explanation

Correctness depends on explicit invariants, safe SQL, transaction/concurrency handling and verification.

Verified

Option 4: Use unparameterized dynamic SQL and rely only on application-side validation for

Use unparameterized dynamic SQL and rely only on application-side validation for delayed-replica verification.

Additional Explanation

Correctness depends on explicit invariants, safe SQL, transaction/concurrency handling and verification.