5315. Triggers & Events: trigger side-effect control — Recover from failure without violating consistency. — logistics — PHP PDO

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

Scenario: A logistics application must handle trigger side-effect control. 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: Run trigger side-effect control without defining transaction boundaries, retry b

Run trigger side-effect control 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 2: Use a parameterized, transaction-aware MySQL 8 implementation for trigger side-e

Use a parameterized, transaction-aware MySQL 8 implementation for trigger side-effect control, 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 3: Use unparameterized dynamic SQL and rely only on application-side validation for

Use unparameterized dynamic SQL and rely only on application-side validation for trigger side-effect control.

Additional Explanation

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

Verified

Option 4: Disable database protections and repair inconsistent rows manually after trigger

Disable database protections and repair inconsistent rows manually after trigger side-effect control runs.

Additional Explanation

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