6122. Outbox & Inbox: outbox locking — Implement the workflow with safe SQL and application handling. — SaaS — Node.js + Express + Sequelize

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

Scenario: A SaaS application must handle outbox locking. 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 outbox

Disable database protections and repair inconsistent rows manually after outbox locking runs.

Additional Explanation

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

Verified

Option 2: Run outbox locking without defining transaction boundaries, retry behavior, or p

Run outbox locking 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 outbox locking

Use a parameterized, transaction-aware MySQL 8 implementation for outbox locking, 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 outbox locking.

Additional Explanation

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