6225. Warehouse & ETL: incremental extraction — Recover from failure without violating consistency. — logistics — Node.js + Express + Sequelize

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

Scenario: A logistics application must handle incremental extraction. Recover from failure without violating consistency. 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

Verified

Option 1: Use unparameterized dynamic SQL and rely only on application-side validation for

Use unparameterized dynamic SQL and rely only on application-side validation for incremental extraction.

Additional Explanation

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

Verified

Option 2: Disable database protections and repair inconsistent rows manually after increme

Disable database protections and repair inconsistent rows manually after incremental extraction runs.

Additional Explanation

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

Verified

Option 3: Run incremental extraction without defining transaction boundaries, retry behavi

Run incremental extraction 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 4: Use a parameterized, transaction-aware MySQL 8 implementation for incremental ex

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

Additional Explanation

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