5382. Triggers & Events: event idempotency — Implement the workflow with safe SQL and application handling. — HRMS — Node.js + Express + Sequelize

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

Scenario: A HRMS application must handle event idempotency. Implement the workflow with safe SQL and application handling. 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 event i

Disable database protections and repair inconsistent rows manually after event idempotency runs.

Additional Explanation

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

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Option 2: Run event idempotency without defining transaction boundaries, retry behavior, o

Run event idempotency 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 event idempote

Use a parameterized, transaction-aware MySQL 8 implementation for event idempotency, 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 event idempotency.

Additional Explanation

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